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100+ Free Phlebotomy Practice Questions

Pass your NHA Certified Phlebotomy Technician (CPT) exam on the first try — instant access, no signup required.

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Question 1
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A therapeutic drug monitoring (TDM) specimen is ordered as a "trough" level. When should the phlebotomist collect the specimen?

A
B
C
D
to track
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2026 Statistics

Key Facts: Phlebotomy Exam

70-80%

First-Time Pass Rate

NHA estimate

~390/500

Passing Score

Scaled score

80-120 hrs

Study Time

Including training

32%

Venipuncture

Largest domain

$155

Exam Fee

NHA

2 years

Certification Valid

10 CEUs to renew

The NHA CPT phlebotomy exam has 100 total questions (80 scored + 20 pretest) with a 2-hour time limit. The exam costs $155 and is administered at PSI testing centers or via online proctoring. Certification is valid for 2 years and requires 10 CEUs for renewal. Venipuncture Procedures (32%) is the largest domain, followed by Specimen Handling (20%), Safety & Compliance (18%), Capillary & Special Collections (16%), and Patient Preparation (14%).

Sample Phlebotomy Practice Questions

Try these sample questions to test your Phlebotomy exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A phlebotomist needs to draw blood for a CBC, a BMP, and coagulation studies. Which tube should be filled FIRST?
A.Lavender-top tube (EDTA)
B.Light blue-top tube (sodium citrate)
C.Green-top tube (heparin)
D.Gray-top tube (sodium fluoride)
Explanation: According to the standard order of draw, the light blue-top tube (sodium citrate) for coagulation studies is drawn after blood culture bottles but before other additive tubes. The correct venipuncture order is: blood cultures, light blue (citrate), red/SST, green (heparin), lavender (EDTA), then gray (oxalate/fluoride). Drawing out of order can cause cross-contamination of additives between tubes, leading to inaccurate results.
2Which vein is the FIRST choice for routine venipuncture in an adult patient?
A.Cephalic vein
B.Basilic vein
C.Median cubital vein
D.Accessory cephalic vein
Explanation: The median cubital vein is the preferred first-choice vein for routine venipuncture because it is large, well-anchored, and located in the antecubital fossa where it is easily accessible. It is also less likely to roll and is further from nerves and arteries than the basilic vein, making it the safest choice for most patients.
3A phlebotomist selects a 21-gauge needle for a routine venipuncture. What does the gauge number indicate about the needle?
A.A 21-gauge needle has a larger bore than a 23-gauge needle
B.A 21-gauge needle has a smaller bore than a 23-gauge needle
C.A 21-gauge needle is longer than a 23-gauge needle
D.The gauge number refers to the length of the bevel
Explanation: In the needle gauge system, a lower gauge number indicates a larger needle bore (internal diameter). A 21-gauge needle has a larger opening than a 23-gauge needle, which means it allows faster blood flow and is standard for routine venipuncture. The 23-gauge is typically used for butterfly sets on smaller or more fragile veins.
4During venipuncture, the phlebotomist should insert the needle at what angle relative to the skin?
A.5 to 10 degrees
B.15 to 30 degrees
C.45 to 60 degrees
D.75 to 90 degrees
Explanation: The recommended insertion angle for venipuncture is 15 to 30 degrees with the bevel facing up. An angle less than 15 degrees may cause the needle to enter the skin superficially without penetrating the vein, while an angle greater than 30 degrees increases the risk of going through the vein entirely (transfixation), causing a hematoma.
5A patient complains of sharp, radiating pain shooting down the arm immediately after needle insertion. What should the phlebotomist do?
A.Redirect the needle slightly to find the vein
B.Remove the needle immediately and apply pressure
C.Ask the patient to relax and continue the draw
D.Apply the tourniquet tighter to stabilize the vein
Explanation: Sharp, shooting, or radiating pain during venipuncture indicates possible nerve involvement. The phlebotomist must immediately discontinue the procedure, remove the needle, and apply pressure. Continuing to probe or redirect could cause permanent nerve damage. The incident should be documented and the draw attempted at a different site.
6What is the maximum recommended time a tourniquet should remain on a patient during venipuncture?
A.30 seconds
B.1 minute
C.3 minutes
D.5 minutes
Explanation: A tourniquet should not remain on the arm for more than 1 minute. Prolonged tourniquet application causes hemoconcentration, where fluid leaks from blood vessels into surrounding tissues, artificially increasing the concentration of large molecules like proteins, lipids, and cell counts. This leads to falsely elevated lab results and can also cause patient discomfort and petechiae.
7A phlebotomist is drawing a light blue-top tube for PT/INR testing. What is the critical fill requirement for this tube?
A.Fill to at least 50% capacity
B.Fill completely to the line - a 9:1 blood-to-anticoagulant ratio is required
C.Overfill slightly to ensure adequate sample
D.Any amount of blood is acceptable if clotting is prevented
Explanation: Light blue-top tubes contain sodium citrate and must be filled to the exact fill line to maintain the critical 9:1 ratio of blood to anticoagulant. An underfilled tube will have excess citrate relative to the blood, falsely prolonging clotting times (PT/INR, PTT). The lab will reject an underfilled citrate tube because the results would be unreliable.
8Which tube additive works by chelating (binding) calcium to prevent clotting?
A.Heparin (green-top tube)
B.EDTA (lavender-top tube)
C.Sodium fluoride (gray-top tube)
D.Silica particles (red-top SST tube)
Explanation: EDTA (ethylenediaminetetraacetic acid) in the lavender-top tube prevents clotting by chelating (binding and removing) calcium ions from the blood. Calcium is essential for the coagulation cascade, so removing it stops clotting. In contrast, heparin works differently - it inhibits thrombin, an enzyme in the clotting pathway, rather than binding calcium.
9A patient has an IV line running in the left arm. The phlebotomist should:
A.Draw from the left arm below the IV site
B.Draw from the right arm using the preferred site
C.Turn off the IV for 2 minutes, then draw from the left arm
D.Draw from the left hand on the same side as the IV
Explanation: When a patient has an IV infusion, the phlebotomist should draw blood from the opposite arm to avoid contamination of the specimen with IV fluids. Drawing from the same arm, even below the IV site, risks dilution of the blood sample with IV solution, leading to inaccurate test results. If no other site is available, the IV should be turned off for at least 2 minutes with physician approval, and the first 5 mL of blood discarded.
10The basilic vein is generally the LAST choice for venipuncture because:
A.It is too small for standard needles
B.It is located near the brachial artery and median nerve
C.It does not contain enough blood volume
D.It collapses more easily than other veins
Explanation: The basilic vein is the least preferred venipuncture site because it runs close to the brachial artery and the median nerve on the inner (medial) aspect of the antecubital fossa. Accidental puncture of the brachial artery can cause significant bleeding, and nerve injury can lead to pain, numbness, or permanent damage. The preferred order is: median cubital (first), cephalic (second), basilic (last resort).

About the Phlebotomy Exam

The NHA Certified Phlebotomy Technician (CPT) exam certifies competency in blood collection, specimen handling, and patient care. Venipuncture procedures make up the largest portion at 32% of the exam.

Questions

80 scored questions

Time Limit

2 hours

Passing Score

Pass/Fail (~390/500)

Exam Fee

$155 (NHA (PSI testing centers))

Phlebotomy Exam Content Outline

32%

Venipuncture Procedures

Order of draw, tube selection, needle gauge, vein selection, technique, complications

20%

Specimen Handling & Processing

Labeling, transport, centrifugation, rejection criteria, quality assurance

18%

Safety & Compliance

Infection control, PPE, OSHA, sharps disposal, bloodborne pathogens

16%

Capillary & Special Collections

Dermal puncture, blood cultures, GTT, ABG, chain of custody

14%

Patient Preparation & Identification

Patient ID, communication, fasting, positioning, informed consent

How to Pass the Phlebotomy Exam

What You Need to Know

  • Passing score: Pass/Fail (~390/500)
  • Exam length: 80 questions
  • Time limit: 2 hours
  • Exam fee: $155

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

Phlebotomy Study Tips from Top Performers

1Memorize the order of draw and tube additives — this is the most tested topic
2Know vein selection: median cubital (primary), cephalic (secondary), basilic (avoid if possible — near brachial artery)
3Venipuncture technique: 15-30° angle, bevel up, tourniquet max 1 minute
4Capillary puncture sites: finger pad for adults, heel for infants under 1 year
5PPE donning: gown → mask → eye protection → gloves (LAST); doffing: gloves FIRST
6Specimens must be labeled at the bedside before leaving the patient

Frequently Asked Questions

What is the phlebotomy CPT pass rate?

The NHA CPT phlebotomy exam has a first-time pass rate of approximately 70-80% for candidates who completed an approved training program. The exam has 100 total questions (80 scored, 20 pretest). Results are available within 48 hours.

How many questions are on the NHA CPT exam?

The NHA CPT phlebotomy exam has 100 total questions: 80 scored and 20 unscored pretest questions. You have 2 hours (120 minutes). All questions are multiple-choice covering venipuncture, specimen handling, safety, capillary collection, and patient preparation.

How hard is the phlebotomy exam?

The NHA CPT exam is considered moderately difficult. Venipuncture (32%) is the largest domain. You must know the order of draw, tube additives, vein selection, and complication management. With 80-120 hours of study and hands-on training, most candidates pass.

What is the order of draw?

The standard order of draw for evacuated tubes is: Blood cultures (yellow/sterile), Light blue (sodium citrate), Red/SST (no additive/gel), Green (heparin), Lavender (EDTA), Gray (sodium fluoride/potassium oxalate). This order prevents additive cross-contamination between tubes.

How long should I study for the phlebotomy exam?

Plan for 80-120 hours of combined classroom and self-study. Prioritize Venipuncture (32%) — memorize order of draw, tube colors/additives, and needle gauges. Practice specimen labeling requirements and transport conditions. Aim for 80%+ on practice tests.