Certified Phlebotomy Technician (NHA) Exam Study Guide
The Certified Phlebotomy Technician (CPT) exam from the National Healthcareer Association (NHA) validates that you can safely and competently collect blood specimens in a clinical setting. It is designed for candidates entering phlebotomy roles in hospitals, clinics, laboratories, and blood-donation centers.
Exam format at a glance
- Scored questions: 100 scored questions.
- Time limit: 120 minutes (a two-hour exam).
- Passing standard: a scaled score of 390.
Because the exam is scored on a scaled system rather than a raw percentage, individual questions are weighted through a statistical process, and the 390 threshold represents the minimum competency level rather than a fixed number of correct answers. This is why it's more productive to aim for consistent mastery across every content domain than to target a specific "number right."
NHA typically includes additional unscored pretest questions that are embedded to gather statistics for future exams; they are indistinguishable from scored items, so treat every question as if it counts.
The CPT exam tests the full workflow of specimen collection. While the exact domain weighting is set by NHA, the core competencies you should master include:
Key knowledge areas
- Patient preparation and identification: verifying patient identity with two identifiers, explaining the procedure, and obtaining consent.
- Order of draw: the sequence of tubes to prevent additive cross-contamination — commonly blood cultures, then light-blue (sodium citrate), red/gold (serum), green (heparin), lavender (EDTA), and gray (fluoride/oxalate).
- Equipment and technique: evacuated tube systems, winged (butterfly) sets, syringe draws, needle gauges, and proper anchoring of the vein.
- Site selection and complications: the antecubital fossa veins (median cubital first), recognizing hemolysis, hematoma, and situations requiring an alternate site.
- Safety and infection control: standard precautions, PPE, sharps disposal, and needlestick protocols.
- Specimen handling and processing: labeling at the bedside, transport conditions, centrifugation, and rejection criteria.
Order of draw and tube/additive matching are among the highest-yield topics because they appear across many question types and directly affect specimen integrity.
A focused four-week plan works well for most candidates, but you can compress or extend it based on your experience.
Suggested weekly focus
- Week 1 — Foundations: anatomy of the arm veins, tube colors and additives, and the order of draw. Build flashcards and drill them daily until recall is automatic.
- Week 2 — Technique and safety: venipuncture and capillary procedures, equipment, PPE, and infection control.
- Week 3 — Complications and special cases: hemolysis, difficult draws, pediatric and geriatric considerations, and specimen rejection.
- Week 4 — Full-length practice: take timed practice exams under the real 120-minute, 100-question conditions to build stamina and calibrate pacing.
Simulating the exact exam length during practice is the single most reliable way to prepare for the 390 passing standard, because it trains both your recall and your endurance under the real time constraint.
Before you start
- Arrive early (or log in early for a remote-proctored session) and have your identification ready.
- Do a quick mental review of the order of draw and tube additives — these are fast, high-yield facts to keep fresh.
During the exam
- Budget your time: with 120 minutes for 100 scored questions, keep moving and flag rather than stall.
- Read each question fully — phlebotomy items often hinge on a single qualifier like "first," "next," or "except."
- Eliminate obviously wrong answers to improve the odds on any question you must guess, since answering everything is better than leaving blanks.
- Use any remaining time to revisit flagged questions, but change an answer only if you have a concrete reason.
Because passing requires a scaled score of 390 and questions are weighted, steady accuracy across all domains matters more than perfection on any single topic.
Frequently asked questions
How many questions are on the NHA Certified Phlebotomy Technician (CPT) exam, and how long do I get?
The CPT exam has 100 scored questions, and you're given 120 minutes (two hours) to complete it. That works out to roughly 1.2 minutes per question, so you have time to read carefully but should avoid getting stuck — flag tough items and return to them rather than burning several minutes on any single question.
What score do I need to pass the CPT exam?
You need a scaled score of 390 to pass. A scaled score is not the same as the number of questions you got right or a straight percentage — NHA converts your raw performance to a standardized scale so that different versions of the exam are equated for difficulty. Because of this, you can't simply target "X correct out of 100"; focus instead on being consistently strong across all content areas.
How should I pace myself during the two-hour exam?
With 100 scored questions in 120 minutes, you average about 72 seconds per question. A practical approach is to aim for roughly 25 questions every 30 minutes so you're on track to finish with a few minutes to spare for review. If a question requires more than about two minutes, make your best choice, flag it, and move on so you never leave easy points unanswered at the end.
Is answering every question worth it, or should I leave hard ones blank?
Because passing is based on a scaled score of 390 and there's no mention of a penalty for wrong answers, you should answer every one of the 100 questions — even ones you're unsure about. Eliminate obviously wrong choices to improve your odds, and use the full 120 minutes; a guessed answer can earn points, but a blank one never will.