PBT Exam Prep Free practice test →

Free PBT Practice Questions

10 free, exam-style ASCP Phlebotomy Technician (PBT) practice questions with answers and explanations. No signup required. Work through them below, then take the full free PBT practice test to study every exam domain.

The PBT exam has 80 questions and runs 2 hours.

These 10 free PBT questions are organized by exam domain, so you can see how each part of the ASCP Phlebotomy Technician blueprint is tested. Reveal the answer and explanation under each question.

Domain 1: Circulatory System (5-10%)

Question 1

A test requires plasma rather than serum. Which statement correctly distinguishes the two?

  1. Serum comes from anticoagulated blood and still contains fibrinogen
  2. Serum and plasma become identical once the specimen is centrifuged
  3. Plasma comes from clotted blood and therefore lacks fibrinogen
  4. Plasma comes from anticoagulated blood and contains fibrinogen
Show answer & explanation

Correct answer: D - Plasma comes from anticoagulated blood and contains fibrinogen

Domain 2: Specimen Collection (45-50%)

Question 2

A phlebotomist must collect a light-blue (sodium citrate) coagulation tube, a lavender (EDTA) tube, and a set of aerobic/anaerobic blood culture bottles from one venipuncture. To follow the CLSI order of draw, which should be filled FIRST?

  1. The aerobic/anaerobic blood culture bottles
  2. The light-blue sodium citrate tube
  3. The lavender EDTA tube
  4. Either additive tube, as long as cultures are drawn last
Show answer & explanation

Correct answer: A - The aerobic/anaerobic blood culture bottles

Question 3

Midway through a venipuncture the needle is in the vein but blood flow stops after only a few milliliters. The phlebotomist suspects the bevel is resting against the vein wall. What is the MOST appropriate next action?

  1. Withdraw slightly and probe laterally to relocate the vein
  2. Gently rotate the needle a quarter turn or ease it back slightly
  3. Advance the needle deeper and at a steeper angle past the block
  4. Remove the needle and reinsert immediately at the same spot
Show answer & explanation

Correct answer: B - Gently rotate the needle a quarter turn or ease it back slightly

Question 4

A serum chemistry panel is collected immediately after a lavender (EDTA) tube during a difficult open-system draw. The lab reports a critically HIGH potassium together with an unexpectedly LOW calcium. What is the MOST likely cause?

  1. A genuine electrolyte imbalance requiring urgent treatment
  2. Hemolysis of the red cells during the draw
  3. Prolonged tourniquet time before the draw
  4. Carryover contamination of the chemistry tube with EDTA
Show answer & explanation

Correct answer: D - Carryover contamination of the chemistry tube with EDTA

Question 5

A light-blue sodium citrate tube intended for a PT/INR is only half filled because the vein collapsed. How should the phlebotomist handle this specimen?

  1. Send it and note on the requisition that it is a short draw
  2. Pool it with a second short citrate tube to reach full volume
  3. Recollect the specimen in a properly filled citrate tube
  4. Refrigerate the tube to preserve the coagulation factors
Show answer & explanation

Correct answer: C - Recollect the specimen in a properly filled citrate tube

Question 6

A tourniquet is left in place for roughly three minutes while the phlebotomist searches for a vein. Which pre-analytical effect is this MOST likely to introduce?

  1. Hemolysis of the red blood cells
  2. Dilution of the specimen with tissue fluid
  3. Hemoconcentration of large molecules and analytes
  4. Activation of the clotting cascade inside the tube
Show answer & explanation

Correct answer: C - Hemoconcentration of large molecules and analytes

Domain 3: Specimen Handling, Transport, and Processing (15-20%)

Question 7

A glucose specimen is drawn into a plain red-top tube (no glycolysis inhibitor) and cannot be transported to the lab right away. To keep the glucose result accurate, the phlebotomist should:

  1. Separate the serum from the cells within the recommended time
  2. Refrigerate the whole-blood tube and send it at shift's end
  3. Add a pinch of sodium fluoride directly to the red-top tube
  4. Freeze the tube right away to halt all cellular activity
Show answer & explanation

Correct answer: A - Separate the serum from the cells within the recommended time

Domain 4: Waived and Point-of-Care Testing (5-10%)

Question 8

Before testing patient samples on a point-of-care glucose meter, the phlebotomist runs the liquid quality-control material and the result falls outside the acceptable range. What is the correct action?

  1. Run the patient samples and add a comment that QC was out of range
  2. Report the patient results, since QC problems do not affect patients
  3. Repeat the patient samples in duplicate to confirm the readings
  4. Withhold patient testing and resolve the QC failure first
Show answer & explanation

Correct answer: D - Withhold patient testing and resolve the QC failure first

Domain 6: Laboratory Operations (15-20%)

Question 9

A phlebotomist sustains an accidental needlestick from a contaminated needle just after a draw. What should be done FIRST?

  1. Wash the wound with soap and running water
  2. Notify the supervisor and complete an incident report
  3. Report to employee health for post-exposure evaluation
  4. Ask the source patient for their bloodborne-pathogen status
Show answer & explanation

Correct answer: A - Wash the wound with soap and running water

Question 10

While a phlebotomist is drawing blood, the patient's spouse asks to be personally told the patient's test results as soon as they are ready. The phlebotomist should:

  1. Release the results, since a spouse is an immediate family member
  2. Explain that results go to the patient and provider, not others without authorization
  3. Share the results only if the spouse confirms the patient's date of birth
  4. Reassure the spouse that a copy will be mailed to the home on file
Show answer & explanation

Correct answer: B - Explain that results go to the patient and provider, not others without authorization

The rest of the PBT blueprint

The PBT exam also covers these domains. Drill them in the full free practice test:

Ready for the real thing?

Practice hundreds more PBT questions with instant scoring, weak-area drills, and full exam simulations.

Start the free practice test See pricing