Phlebotomy Practice Test: 30 Free Questions with Answers
Thirty exam-style questions with answers and explanations, weighted the way the NHA CPT exam is: most of them on routine collections, the rest on safety, patient preparation, special collections and processing. No account needed. Tap an answer to see whether you got it right and why. Your score and weakest area appear at the end. Taking a specific exam? Try the NHA CPT, ASCP PBT or AMT RPT practice exam.
Written by Benjamin Tibbs, a phlebotomy studentChecked against CLSI, OSHA, CDC and The Joint CommissionUpdated October 2026
What is on this phlebotomy practice test?
This free phlebotomy practice test has 30 exam-style multiple-choice questions with answers and explanations, weighted like the NHA CPT test plan. No signup is needed. The real exams are longer: the NHA CPT has 120 questions in 2 hours, the ASCP PBT 80 in 2 hours, and the AMT RPT 200 in 2.5 hours.
Key facts
- NHA CPT: 120 questions: 100 scored and 20 unscored pretest items in 2 hours; passing score 390 (scaled score from 200 to 500). Retake: 30 days after each attempt. Source: NHA Candidate Handbook (updated 10/05/2026)
- ASCP PBT: 80 multiple-choice questions in 2 hours; passing score 400 (scaled score). Retake: 30 days after a failed attempt. Source: ASCP BOC PBT Content Guideline (rev. Sept 25, 2025)
- AMT RPT: 200 scored questions (AMT exams may also include unscored pretest items) in 2.5 hours; passing score 70 (scaled score from 0 to 100). Retake: 45 days after a failed attempt. Source: AMT Candidate Handbook (rev. April 2026)
- The NHA CPT test plan weights routine blood collections 28%, safety and compliance 26%, patient preparation 20%, processing 14% and special collections 12%. Source: NHA 2025 CPT Test Plan
Show answer
Answer: A. Before and after every patient encounter
Hand hygiene must be performed both before and after every patient encounter per CDC guidelines, and OSHA also requires handwashing after removing gloves. It is one of the most effective ways to prevent the spread of infection in healthcare.
Why the other choices are wrong
- B. Skipping hand hygiene before the draw lets organisms on your hands reach the patient and the puncture site.
- C. Hands also carry the patient's organisms away from the draw, so hand hygiene is required afterwards as well.
- D. Hand hygiene is required at every patient encounter, not only when hands look dirty. Most contamination is invisible.
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Answer: D. Activate the safety device and dispose in the sharps container
OSHA's Bloodborne Pathogens Standard requires contaminated sharps to be discarded immediately in a puncture-resistant sharps container and prohibits recapping except in rare situations where no alternative is feasible, which do not apply to routine venipuncture. Activate the safety device immediately after withdrawal.
Why the other choices are wrong
- A. OSHA prohibits recapping except where no alternative is feasible, which never applies to a routine draw. Recapping is a classic cause of needlesticks.
- B. Handing a used sharp to anyone, including the patient, exposes them to a needlestick and bloodborne pathogens.
- C. An exposed, contaminated needle left on the work surface is a needlestick waiting to happen. Engage the safety device and dispose of it immediately, then label.
Show answer
Answer: B. Wash the wound immediately with soap and water
The immediate first aid response to a needlestick is to wash the wound with soap and running water. Reporting, documentation, and post-exposure testing are critical follow-up steps, but wound cleansing must happen first to reduce pathogen exposure.
Why the other choices are wrong
- A. Reporting is required, but it comes right after first aid. Washing the wound comes first.
- C. The incident report is part of the follow-up, after the wound has been washed and the exposure reported.
- D. Source-patient testing is arranged afterwards through the employer's exposure-control process, with consent where state law requires it. It is never the first step.
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Answer: A. Flush the eye with clean water or saline at an eyewash station
CDC first aid for blood splashed into the eyes is to irrigate them right away with clean water, saline or a sterile irrigant, for example at an eyewash station. Report the exposure immediately afterward, because post-exposure evaluation is time-sensitive.
Why the other choices are wrong
- B. Reporting is required, but only after first aid. The longer blood stays in the eye, the longer the exposure lasts.
- C. Alcohol injures the eye and does not wash the blood out. Irrigate with clean water or saline instead.
- D. Source-patient testing is arranged afterwards through the employer's exposure-control plan. Flushing the eye comes first.
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Answer: B. Use mechanical means such as tongs or a brush and dustpan
OSHA's Bloodborne Pathogens Standard (29 CFR 1910.1030) states that broken glassware that may be contaminated must not be picked up directly with the hands; it is cleaned up by mechanical means such as a brush and dustpan, tongs or forceps. The glass goes into a sharps container, and the area is then decontaminated with an appropriate disinfectant.
Why the other choices are wrong
- A. Gloves do not stop glass cuts. OSHA prohibits picking up possibly contaminated broken glass directly with the hands, gloved or not.
- C. Pressing gauze or towels onto broken glass still puts your hand on the shards. Use tongs or a brush and dustpan.
- D. Contaminated broken glass goes into a sharps container, not the regular trash, and the area must be disinfected, not just mopped dry.
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Answer: C. Decline, because she has no job-related need to know
Under the HIPAA Privacy Rule's minimum necessary standard (45 CFR 164.502(b)), workforce members use and disclose protected health information only as their job requires. Curiosity is not a job purpose, so a fellow employee is not told, and even the names of the tests ordered are protected health information.
Why the other choices are wrong
- A. Working for the same hospital does not entitle someone to a patient's information. Access is limited to what each person's job requires.
- B. The tests ordered are protected health information too, and they can reveal a diagnosis. Nothing is shared without a job-related purpose.
- D. Pointing her to the chart is still an improper disclosure, and opening a record without a job reason is itself a HIPAA violation.
Show answer
Answer: A. Offer it at no cost within 10 working days of assignment
OSHA (29 CFR 1910.1030(f)) requires the employer to make the hepatitis B vaccine series available at no cost to the employee within 10 working days of initial assignment to work with exposure risk. An employee may decline by signing the declination statement and can still get the vaccine later, at no cost, if they change their mind.
Why the other choices are wrong
- B. The vaccine must be free to the employee. OSHA places the cost on the employer.
- C. Waiting for an exposure defeats the purpose. The series must be offered within 10 working days of starting work with exposure risk; post-exposure follow-up is a separate requirement.
- D. Employees may decline by signing OSHA's declination statement, and they can still get the vaccine free later if they change their mind.
Show answer
Answer: C. Two — such as name and date of birth
The Joint Commission requires a minimum of two patient identifiers before any specimen collection (NPG.01.01.01, formerly NPSG.01.01.01). Common identifiers include full name and date of birth. Room number is never an acceptable identifier because patients can be moved.
Review: Patient Identification
Why the other choices are wrong
- A. One identifier is not enough. The Joint Commission requires at least two, such as full name and date of birth.
- B. Two identifiers is the minimum, and a room number is never an acceptable identifier because patients move.
- D. Scanning the band does not replace active identification. Have the patient state two identifiers, such as full name and date of birth, and match them to the band and the requisition.
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Answer: D. Note the coffee intake on the requisition and draw the specimen
Fasting means nothing but water. Coffee is a deviation from the instructions, and caffeine can affect some analytes such as glucose. Document the intake on the requisition and proceed per facility policy, so the ordering provider can decide whether to accept the result or reorder the test.
Why the other choices are wrong
- A. You cannot assume the coffee has no effect, and the deviation from the fasting instructions still has to be documented for the provider.
- B. Leaving out known noncompliance hides information the provider needs to interpret the result.
- C. Canceling is usually not the phlebotomist's call. Follow facility policy, which typically means drawing, documenting the coffee, and letting the provider decide.
Show answer
Answer: A. Latex
Latex allergy is the most critical allergy to screen for because severe latex reactions can cause anaphylaxis. Some gloves, tourniquets and bandages may still contain latex. If a patient reports a latex allergy, the phlebotomist must use non-latex alternatives for all equipment.
Why the other choices are wrong
- B. Iodine matters before some special collections, such as blood cultures when an iodine prep is used, but latex is the allergy to screen for before every routine draw.
- C. Alcohol sensitivity is uncommon. Latex is the critical screen because it can cause anaphylaxis.
- D. Adhesive sensitivity is worth noting for the bandage, but it is not the critical safety screen. Latex can cause a life-threatening reaction.
Show answer
Answer: B. The right arm, the side opposite the mastectomy
CLSI PRE02 (8th ed.) says not to draw from the side of a mastectomy without the patient's physician's permission, however long ago the surgery was. Lymph node removal can impair drainage from that arm, and a draw there risks lymphedema. With a usable vein in the other arm, draw there.
Review: Difficult Venipuncture
Why the other choices are wrong
- A. Time since surgery does not lift the restriction. Without the physician's permission, avoid the mastectomy side.
- C. Tourniquet time is not the issue. The concern is impaired lymph drainage on the mastectomy side, and a tourniquet there adds pressure to that arm.
- D. A smaller needle does not remove the risk to the affected arm. Use the arm on the other side.
Show answer
Answer: B. Implied consent
Implied consent is given through actions rather than words: sitting in the drawing chair and offering an arm signals agreement to a routine draw. The patient can withdraw it at any time; if he says stop, stop. Informed consent, with an explanation of risks and alternatives, is required for higher-risk procedures.
Why the other choices are wrong
- A. Informed consent means the patient was told the risks, benefits and alternatives and agreed, usually with documentation. Holding out an arm alone is not that.
- C. Expressed consent is given in words, spoken or written. This patient said nothing.
- D. Proxy consent is given by someone else on the patient's behalf, such as a guardian. This adult acted for himself.
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Answer: D. Ask the patient to take the gum out before starting
Before a venipuncture the patient's mouth should be empty: no gum, food or thermometer. Reference laboratory venipuncture procedures include this step because a patient who faints during the draw could choke on whatever is in their mouth.
Why the other choices are wrong
- A. The concern is not the result but the patient: if they faint, gum in the mouth can be choked on.
- B. Writing the gum down does nothing about the choking hazard. Have the patient take it out first.
- C. A CBC does not require fasting, so there is no reason to reschedule. The gum just needs to come out.
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Answer: C. Blood culture, Light blue, Red/Gold, Green, Lavender, Gray
The CLSI-recommended order of draw is: blood culture bottles (or yellow SPS tubes), light blue (citrate), red/gold (serum: clot activator or gel), green (heparin), lavender (EDTA), gray (fluoride/oxalate). This order prevents cross-contamination of additives between tubes.
Why the other choices are wrong
- A. Drawing lavender (EDTA) early carries EDTA into later tubes, which falsely raises potassium and lowers calcium. Blood cultures and light blue come first.
- B. Red/gold before light blue lets clot activator reach the coagulation tube, and blood cultures are missing from the start.
- D. Blood cultures must come first to protect sterility, and red/gold belongs before green and lavender, not at the end.
Show answer
Answer: B. To keep clot activator out of the coagulation tube
Clot activators from red/gold-top tubes can carry over via the needle and contaminate the citrate tube, artificially activating the coagulation cascade. This would produce falsely shortened PT/INR and PTT results, potentially affecting patient anticoagulant therapy decisions.
Why the other choices are wrong
- A. Light blue tubes must be filled correctly (9:1 blood to citrate), but fill volume is not why the tube goes before clot-activator tubes.
- C. Tube fragility has nothing to do with the order of draw. The order prevents additive carryover.
- D. Citrate temperature is not the reason. Clot activator carried into the citrate tube would distort coagulation results.
Show answer
Answer: A. 1 minute
A tourniquet should not remain applied for more than 1 minute. Prolonged application causes hemoconcentration — an artificial increase in the concentration of non-filterable blood components (proteins, cells, lipids) — which can falsely elevate results for potassium, calcium, and total protein.
Why the other choices are wrong
- B. Thirty seconds is safe, but it is not the limit. The guideline is no more than 1 minute.
- C. Three minutes is well past the 1-minute limit and causes hemoconcentration.
- D. Five minutes far exceeds the 1-minute limit and can falsely raise potassium, calcium and total protein.
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Answer: D. Median cubital vein
The median cubital vein is the preferred venipuncture site because it is large, well-anchored, close to the surface, and less painful than other options. The cephalic vein is the second choice: fairly well anchored but often harder to palpate. The basilic vein is last because it rolls easily and lies near the brachial artery and median nerve.
Why the other choices are wrong
- A. The cephalic vein is the second choice: it is fairly well anchored but often harder to feel than the median cubital.
- B. The basilic vein is the last choice in the antecubital area: it rolls easily and lies near the brachial artery and the median nerve.
- C. The median antebrachial vein is an acceptable alternative in some patients, but the median cubital is the standard first choice.
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Answer: C. 8 to 10 times
EDTA tubes should be gently inverted 8 to 10 times to ensure thorough mixing with the anticoagulant. Insufficient mixing leads to micro-clot formation, which can cause falsely low platelet counts and affect CBC results. Vigorous shaking causes hemolysis.
Why the other choices are wrong
- A. Two or three inversions do not fully mix the EDTA, so micro-clots can form and lower platelet counts.
- B. Fifteen to twenty inversions is more than needed. The standard for EDTA is 8 to 10 gentle inversions.
- D. Vigorous shaking damages red cells and causes hemolysis. Mix by gentle inversion.
Show answer
Answer: D. Have a nurse stop the IV for at least 2 minutes; draw below it
CLSI recommends that the infusion be turned off for at least 2 minutes, by the patient's nurse rather than the phlebotomist, with the tourniquet placed between the IV and the puncture site and a vein chosen below the IV. Note on the requisition that the specimen was drawn below an IV and which fluid was running, since IV fluid can still contaminate the sample.
Review: Difficult Venipuncture
Why the other choices are wrong
- A. Blood drawn above a running IV is diluted and contaminated by the IV fluid, which can falsely change glucose, electrolytes and other results.
- B. Only the patient's nurse may stop or adjust an IV, and drawing above the site still risks contamination from the fluid.
- C. Phlebotomists do not draw from IV catheters or other vascular access devices. Line draws are done by trained nursing staff under their own protocol.
Show answer
Answer: B. 15 to 30 degrees
The needle goes in bevel up at an angle of 30 degrees or less, per CLSI PRE02 (8th ed.); reference laboratory procedures put it at 15 to 30 degrees depending on how deep the vein lies. Too steep an angle risks going through the back wall of the vein, and too shallow an angle can miss the vein.
Why the other choices are wrong
- A. Held almost flat, the needle can slide along the top of the vein without entering it, or enter only partway.
- C. An angle this steep risks passing through the back wall of the vein, which causes a hematoma and can reach a nerve or artery.
- D. A perpendicular stick is for intramuscular injections, not venipuncture. It would go straight through the vein.
Show answer
Answer: A. It completes the antisepsis and avoids stinging and hemolysis
Alcohol does its antiseptic work as it dries, which takes about 30 seconds. Inserting the needle through wet alcohol stings and can carry alcohol into the specimen, where it may cause hemolysis. Do not wipe, fan or blow on the site to speed drying; that recontaminates it.
Why the other choices are wrong
- B. Drying has nothing to do with seeing the vein. The vein is chosen before the site is cleaned.
- C. Alcohol on the skin does not reach the tube additive. The reasons are antisepsis, stinging and hemolysis.
- D. Tourniquet timing is not the reason. Drying lets the alcohol finish killing skin organisms and keeps it out of the specimen.
Show answer
Answer: C. Have her keep the arm straight and press on the gauze
Bending the elbow can let blood leak into the tissue and can reopen the puncture when the arm is straightened again, causing a hematoma. Keep the arm extended, apply firm pressure over the gauze until bleeding stops, and check the site before applying the bandage.
Why the other choices are wrong
- A. Bending the elbow lets blood leak into the tissue and can reopen the site when the arm straightens, causing a hematoma.
- B. Rubbing disturbs the forming clot and can cause bruising. Hold steady pressure instead.
- D. Bandaging before the bleeding stops lets blood seep under the skin and form a hematoma. Hold pressure until bleeding stops.
Show answer
Answer: B. The medial or lateral plantar surface of the heel
Infant capillary punctures are performed on the medial or lateral plantar surface of the heel to avoid the calcaneus (heel bone) and the posterior curvature. Finger sticks are not recommended for infants under 1 year because their fingers are too small, and the bone is too close to the skin surface.
Why the other choices are wrong
- A. The thumb is not used for capillary puncture. It has a pulse and calloused skin, and in infants the bone is too close to the surface.
- C. The earlobe is not a recommended capillary puncture site for infants.
- D. Fingersticks are not recommended for infants under 1 year: the bone is too close to the skin surface.
Show answer
Answer: A. Chlorhexidine or povidone-iodine, left to dry
Blood culture collection requires enhanced antisepsis using chlorhexidine (30-second scrub, then air-dry at least 30 seconds) or povidone-iodine (1.5 to 2 minutes to dry) to minimize skin flora contamination. Alcohol alone is insufficient. Contaminated blood cultures lead to false-positive results and unnecessary antibiotic treatment.
Review: Blood Culture Collection
Why the other choices are wrong
- B. Alcohol alone does not reduce skin flora enough for blood cultures, which raises the contamination (false-positive) rate.
- C. Soap and water is not an antiseptic prep. Blood cultures need chlorhexidine or iodine with the full contact and drying time.
- D. Gloves protect you, not the culture. Skin antisepsis is still required to keep skin flora out of the bottle.
Show answer
Answer: C. 8 to 10 mL
Adult blood culture bottles, such as BD BACTEC and bioMérieux BacT/ALERT, are designed for 8 to 10 mL each, so an aerobic and anaerobic set takes about 16 to 20 mL. Blood volume is the biggest single factor in detecting a bloodstream infection: each missing milliliter lowers the chance of growing the organism.
Review: Blood Culture Collection
Why the other choices are wrong
- A. That is a pediatric volume, not an adult one. Underfilled adult bottles are a leading cause of missed bloodstream infections.
- B. This underfills an adult bottle. The chance of detecting the organism rises with each added milliliter up to the bottle's 10 mL limit.
- D. That is about the volume of a whole set (two bottles), not one bottle, and overfilling a bottle can cause a false-positive signal.
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Answer: D. The lavender EDTA tube
CLSI GP42 sets a different order for capillary collection than for venipuncture: blood gases, then EDTA, then other additive tubes, then serum. Platelets start clumping at a skin puncture right away, so the hematology (EDTA) specimen is filled first to avoid microclots and falsely low platelet counts.
Why the other choices are wrong
- A. Serum tubes are filled last in a capillary collection, because a serum specimen is meant to clot and is least harmed by delay.
- B. Heparin and other additive tubes come after EDTA in a capillary collection.
- C. The capillary order is set by clotting, not volume. Platelets clump as the puncture starts to clot, so EDTA goes first.
Show answer
Answer: C. Plasma contains fibrinogen; serum is the fluid left after blood clots
Plasma is the liquid portion of blood collected with an anticoagulant — it retains all clotting factors including fibrinogen. Serum is obtained after blood is allowed to clot in a tube without anticoagulant, so it lacks fibrinogen and most clotting factors. This distinction determines which tube type to use for specific tests.
Why the other choices are wrong
- A. This is reversed. Plasma contains the clotting factors; serum is what is left after clotting, so it lacks fibrinogen.
- B. The terms are not interchangeable. Whether a test needs serum or plasma decides which tube you draw.
- D. Serum versus plasma depends on whether the tube has an anticoagulant, not on whether the sample came from a capillary or a vein.
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Answer: B. A needle that was too narrow, or drawing back too forcefully
Hemolysis is commonly caused by using a small-bore needle (high gauge number, e.g. 25G), pulling the syringe plunger back too quickly, vigorous mixing, or forcing blood through a small needle into a tube. Hemolyzed specimens release intracellular contents (especially potassium and LDH), producing falsely elevated results.
Why the other choices are wrong
- A. Correct storage temperature protects the specimen. It does not explain hemolysis.
- C. Proper hydration does not cause hemolysis. Look for a technique problem such as a narrow-bore needle or a forceful draw.
- D. Centrifuging at the correct speed does not damage red cells. Hemolysis points to how the blood was collected.
Show answer
Answer: A. A signed, dated record of everyone who handles the specimen
Chain of custody is an unbroken written record, with signatures, dates and times, of every person who has possession of the specimen from collection to testing, usually with tamper-evident seals. Any gap can make the result inadmissible. The federal Custody and Control Form used in workplace drug testing (49 CFR Part 40) works the same way.
Why the other choices are wrong
- B. A physician's order may be needed for the test, but it does not establish custody. Custody is the documented record of everyone who handles the specimen.
- C. Timing rules depend on the test. Chain of custody requires documentation of every handoff, however long transport takes.
- D. A witness to the draw is not what chain of custody means. It is the signed record of each person who has the specimen, from collection to analysis.
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Answer: D. Opposite a balance tube of equal size and volume
A centrifuge must be balanced: each tube goes directly opposite a tube of the same size holding the same volume (a water-filled tube works as a balance). An unbalanced rotor vibrates, can break tubes and release aerosols, and can damage the centrifuge. Keep stoppers on, and do not open the lid until the rotor has stopped.
Why the other choices are wrong
- A. A single tube in any slot unbalances the rotor, which can shake the centrifuge, break the tube and release aerosols.
- B. Tubes side by side put all the weight on one side of the rotor. A balance tube goes directly opposite.
- C. An empty tube does not weigh the same as a filled one. The balance tube must hold the same volume.
More free practice tests
Every set has different questions, each with an explanation and your score by domain. No account needed.
By certification exam
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Topic quizzes
The three phlebotomy certification exams
Question counts, time limits and passing scores from each certifying body's own documents, checked October 6, 2026.
| Exam | Questions | Time | Passing score | Practice |
|---|---|---|---|---|
| NHA CPTNational Healthcareer Association | 120 questions: 100 scored and 20 unscored pretest items | 2 hours | 390 (scaled score from 200 to 500) | NHA CPT practice exam |
| ASCP PBTAmerican Society for Clinical Pathology Board of Certification | 80 multiple-choice questions | 2 hours | 400 (scaled score) | ASCP PBT practice exam |
| AMT RPTAmerican Medical Technologists | 200 scored questions (AMT exams may also include unscored pretest items) | 2.5 hours | 70 (scaled score from 0 to 100) | AMT RPT practice exam |
More detail: how each exam is scored · retake rules · NHA vs ASCP vs AMT · all exam facts with sources
Phlebotomy exam questions people ask
How many questions are on the phlebotomy certification exam?
It depends on the exam. The NHA CPT has 120 questions: 100 scored and 20 unscored pretest items in 2 hours. The ASCP PBT has 80 multiple-choice questions in 2 hours and is computer adaptive. The AMT RPT has 200 scored questions (amt exams may also include unscored pretest items) in 2.5 hours.
What score do you need to pass the phlebotomy exam?
All three use scaled scores, not percentages. The NHA CPT passing score is 390 on a 200–500 scale, the ASCP PBT passing score is 400, and the AMT RPT passing score is 70 on a 0–100 scale. A scaled score is not the share of questions you answered correctly.
What topics are on the phlebotomy exam?
The NHA CPT test plan weights routine blood collections most (28%), then safety and compliance (26%), patient preparation (20%), processing (14%) and special collections (12%). Expect order of draw, patient identification, infection control, tube additives, specimen handling and complications such as hematomas and fainting.
Are these practice questions like the real exam?
They use the same multiple-choice, scenario-based style and are weighted to the NHA CPT blueprint, and each explanation names the standard it comes from. No short practice set can predict your exam score, but your results show which areas to study first.
Can you retake the phlebotomy exam if you fail?
Yes. The NHA CPT allows a retake 30 days after each attempt, the ASCP PBT 30 days after a failed attempt, and the AMT RPT 45 days after a failed attempt. Each retake costs another exam fee, so it pays to find your weak areas before test day.
Which phlebotomy certification should I take?
All three are national certifications. Check which one employers and your training program in your area ask for, then compare the formats: the NHA CPT is a fixed 120-question exam, the ASCP PBT is a shorter adaptive exam, and the AMT RPT is the longest at 200 questions.
How should I study for the phlebotomy exam?
Practice with questions rather than rereading notes, and spend most of your time on the domains you miss most. Take a practice set like this one, review every explanation, study your weakest area, then test yourself again on new questions.
More detail: passing scores · retake policies · NHA vs ASCP vs AMT
Clinical References
- CLSI PRE02-Ed8 — Collection of Diagnostic Venous Blood Specimens (8th ed., 2025)
- NHA CPT Exam Content Outline (2024)
- ASCP Board of Certification Content Guidelines
- OSHA Bloodborne Pathogens Standard (29 CFR 1910.1030)
- CDC Guidelines for Infection Control in Healthcare Settings