Free NHA CPT practice questions with answers

Twenty-five original, source-verified NHA CPT questions with full answers and rationale below, free to read, no account required. A new set every day.

1. Question 1

   A patient on a ventilator cannot remove the tube in their mouth before a blood draw. Given the general rule against objects in a patient's mouth during collection, how is this situation handled?

   • A different phlebotomist must be called in specifically for ventilated patients
   • The draw must be postponed indefinitely until the ventilator tube can be removed
   • The rule against mouth objects applies with no exceptions, including ventilated patients
   • It is treated as an exception, since ventilator tubing cannot reasonably be removed for the drawCorrect

   Why: Postponing the draw indefinitely is not workable for a ventilated patient whose breathing tube cannot simply come out for a lab test. Applying the rule with no exceptions ignores that ventilated patients are specifically named as an exception to it. Nothing in the source calls for a different phlebotomist to be assigned specifically for ventilated patients. Because a ventilator tube cannot be removed the way gum or a thermometer can, ventilated patients are one of the named exceptions to the general rule against objects in the mouth during collection. Primary reference: Phlebotomy Essentials, 8th Edition, Chapter 8, PDF p. 576.

2. Question 2

   A cryoglobulin specimen requires which special handling during transport?

   • Keeping the specimen at 37°CCorrect
   • Protecting the specimen from light
   • Chilling the specimen in an ice slurry
   • Freezing the specimen immediately at -20°C

   Why: Cryoglobulins are proteins that can precipitate out of solution if the specimen cools below body temperature, so a cryoglobulin specimen belongs with the small set of specimens that must be kept at body temperature rather than chilled. Chilling in an ice slurry is the opposite handling requirement, reserved for analytes such as ammonia and lactic acid. Protecting from light is the requirement for photosensitive analytes such as bilirubin, an unrelated handling category. Immediate freezing at -20°C describes long-term frozen storage, not the transport condition cryoglobulin needs. Primary reference: Phlebotomy Essentials, 8th Edition, Chapter 12, PDF p. 913. Cross-reference: Phlebotomy Essentials, 8th Edition, PDF p. 921.

3. Question 3

   A phlebotomist notices a collection tube has passed its printed expiration date. What should be done?

   • The tube should be discarded and not used, since the manufacturer no longer guarantees its additive and vacuumCorrect
   • The expiration date only actually applies to tubes that were stored above 25 degrees Celsius
   • The tube can still safely be used as long as it is shaken vigorously first
   • The tube can still be used, but only for tests that do not require any additive

   Why: Once a tube passes its expiration date, the manufacturer's guarantee about additive integrity and correct vacuum no longer applies, so using it risks an inaccurate result or an improperly filled tube, and the correct response is to discard it. Shaking a specimen is never appropriate handling, since it can cause hemolysis, and it does not restore an expired tube. Expiration affects the whole tube, not selectively based on whether the ordered test needs an additive. The expiration date reflects age and proper storage together, not only temperatures above 25 degrees Celsius. Primary reference: Phlebotomy Essentials, 8th Edition, Chapter 7, PDF p. 501.

4. Question 4

   A phlebotomy student finishes a training program and receives a document from the school confirming she completed the required coursework and clinical hours. This document by itself is best described as:

   • A continuing education credit, used only to renew an existing credential
   • A certificate of completion, which documents finishing training but differs from national certificationCorrect
   • National certification, automatically awarded whenever a program is finished
   • A state license, required in nearly every state before working as a phlebotomist

   Why: A certificate of completion is issued directly by the training facility and simply documents that a student finished a program's academic and clinical requirements, which is not the same thing as national certification. Most states do not require a license to work as a phlebotomist, so describing the school document as a state license misstates both what it is and how common licensure requirements actually are. National certification is a separate, voluntary credential from an outside certifying agency that still requires its own application, fee, and exam, so it is not something a training program awards automatically. Continuing education credits are used later to renew an already-earned credential, not to document a student's initial completion of a program. Primary reference: Phlebotomy Essentials, 8th Edition, Chapter 1, PDF p. 63.

5. Question 5

   A therapeutic drug monitoring order asks for a peak level following an intramuscular dose. Approximately how long after the injection should this specimen typically be collected?

   • Immediately before the next scheduled dose
   • About 30 minutes after the injection
   • About 24 hours after the injection
   • About 60 minutes after the injectionCorrect

   Why: Peak drug levels are timed to catch the moment the drug concentration in the blood is expected to be at its highest, and that timing shifts depending on how the drug entered the body because absorption speed differs by route. An intramuscular dose is generally expected to peak somewhat later than an intravenous dose but sooner than an oral dose, which places its typical peak-draw window in roughly the interval described here rather than the shorter IV window or the pre-next-dose timing used for trough levels. Waiting a full day would miss the peak concentration entirely and would instead approach another trough. Primary reference: Phlebotomy Essentials, 8th Edition, Chapter 11, PDF p. 841.

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7. Question 6

   A phlebotomist walks into an inpatient's room for a scheduled draw and finds the patient asleep. What is the correct next step?

   • Skip the room and mark the order as refused by the patient
   • Ask a family member in the hallway to consent on the sleeping patient's behalf
   • Collect the specimen quietly without waking the patient, to avoid disturbing them
   • Wake the patient gently and speak softly before proceeding with identificationCorrect

   Why: Drawing blood while the patient remains asleep would skip identification and consent entirely, which is never acceptable. Marking the order as refused is inaccurate, since the patient has not actually declined the test. Consent from a family member in the hallway does not substitute for waking a patient who is capable of responding for themselves. Because proper identification and informed consent cannot occur while a patient is asleep, the described step is to wake the patient gently and speak softly before continuing. Primary reference: Phlebotomy Essentials, 8th Edition, Chapter 8, PDF p. 567.

8. Question 7

   A patient contracts West Nile virus after being bitten by an infected mosquito. This route of transmission is classified as:

   • vector transmissionCorrect
   • vehicle transmission
   • airborne transmission
   • droplet transmission

   Why: An insect that physically carries and delivers a pathogen through a bite is the defining feature of this transmission category. Transmission through contaminated food, water, or drugs describes a different route that does not involve a living carrier like an insect. Particles generated by a cough or sneeze, and particles that stay suspended in air for long periods, both describe respiratory routes unrelated to an insect bite. Primary reference: Phlebotomy Essentials, 8th Edition, Chapter 3, PDF p. 205.

9. Question 8

   How does the routine procedure describe grasping an infant's foot for a heelstick?

   • Wrap the whole leg tightly from knee to ankle
   • Grip the ankle firmly while leaving the foot to hang loosely
   • Hold only the toes, leaving the heel completely untouched until the puncture
   • Encircle the heel: index finger around the arch, thumb around the bottomCorrect

   Why: Encircling the heel this way gives the technician firm control over the exact puncture area while keeping the grip gentle enough not to injure the infant's foot. Leaving the heel untouched would make it much harder to keep the site steady during the puncture. Gripping only the ankle or wrapping the entire leg does not provide the localized control needed right at the heel. Primary reference: Phlebotomy Essentials, 8th Edition, Chapter 10, PDF p. 754.

10. Question 9

    Cooking oil in a skillet on a break-room hot plate ignites. Which class of fire does this represent, and what extinguishing approach is appropriate?

    • A Class K fire, requiring an agent that cools and smothers without splashing the hot grease.Correct
    • A Class A fire, requiring dry sand to bury the flames.
    • A Class C fire, requiring plain water to cool the flames quickly.
    • A Class D fire, best left entirely to firefighting personnel with no extinguisher used.

    Why: A fire fueled by high-temperature cooking grease or oil belongs to a specific fire class of its own, and the recommended agent for it is formulated to cool the grease and smother the flame while minimizing splashing, since splashing hot grease can spread the fire and cause burns. This is a different fuel source than an ordinary combustible material, an energized electrical circuit, or a reactive metal, so the extinguishing method appropriate for grease is not the same as those used for the other classes. Plain water on hot grease can cause dangerous splattering rather than putting the fire out, and dry sand is associated with reactive-metal fires, not grease fires. Primary reference: Phlebotomy Essentials, 8th Edition, Chapter 3, PDF p. 260. Cross-reference: Phlebotomy Essentials, 8th Edition, PDF p. 261.

11. Question 10

    What is the recommended antiseptic for cleaning the skin before a routine venipuncture?

    • Plain soap and water only
    • Full-strength iodine solution
    • 70% isopropyl alcoholCorrect
    • Undiluted hydrogen peroxide

    Why: Iodine is used for certain specialized collections rather than being the described routine choice for an ordinary venipuncture site. Soap and water is a hand hygiene method rather than the described skin antiseptic used at the puncture site itself. Hydrogen peroxide is not mentioned as the routine site antiseptic in this context. The antiseptic identified for a routine venipuncture site is 70% isopropyl alcohol, typically supplied in prepackaged prep pads. Primary reference: Phlebotomy Essentials, 8th Edition, Chapter 8, PDF p. 591.

12. Question 11

    How many gentle inversions are normally required to properly mix an EDTA (lavender-top) tube after collection?

    • 1 to 2 inversions
    • 8 to 10 inversionsCorrect
    • 15 to 20 inversions
    • 30 to 40 inversions

    Why: This number of inversions is enough to disperse the EDTA throughout the specimen and prevent platelet clumping and microclots without being so vigorous that it damages the cells. One or two inversions would not reliably distribute the additive through the entire specimen. Fifteen to twenty inversions go well beyond what gentle mixing of an EDTA tube calls for. Thirty to forty inversions are far more than the number described for properly mixing this tube type. Primary reference: Phlebotomy Essentials, 8th Edition, Chapter 7, PDF p. 516.

13. Question 12

    A phlebotomist is selecting an alcohol-based hand sanitizer for use between patients when hands are not visibly soiled. According to CDC/HICPAC guidelines, what is the minimum alcohol concentration the product should contain?

    • 10% alcohol
    • 25% alcohol
    • 60% alcoholCorrect
    • 100% alcohol only, with no lower concentration acceptable

    Why: This is the minimum concentration these guidelines call for in an alcohol-based hand cleaner used as a substitute for handwashing when hands are not visibly soiled. A concentration as low as 10% would fall well short of what these guidelines actually require for effective use. A concentration around 25% is likewise below the minimum threshold specified. Requiring pure, 100% alcohol overstates the guideline, which sets a minimum well below full-strength concentration. Primary reference: Phlebotomy Essentials, 8th Edition, Chapter 3, PDF p. 223.

14. Question 13

    If povidone-iodine antiseptic residue gets into a capillary specimen during skin-puncture collection, potassium and phosphate results can be falsely elevated along with which other analyte?

    • Hemoglobin
    • Platelet count
    • Sodium
    • Uric acidCorrect

    Why: Iodine-based antiseptic residue that gets into a capillary specimen can chemically interfere with certain assays, and the text specifically links this contamination to falsely elevated uric acid, along with phosphate and potassium. Sodium is not one of the analytes the text names as affected by povidone-iodine contamination in this passage. Hemoglobin is a hematology parameter not described as distorted by this particular antiseptic contamination. Platelet count is likewise not among the analytes the text lists as falsely elevated by povidone-iodine residue. Primary reference: Phlebotomy Essentials, 8th Edition, Chapter 9, PDF p. 708.

15. Question 14

    A hospital wants to reduce the risk of exsanguination, or blood loss to a life-threatening degree, in its smallest patients. Roughly what percentage of an infant's total blood volume removed at one time or over a short period is considered potentially life-threatening?

    • More than about 50 percent
    • Any amount at all, no matter how small
    • More than about 2 percent
    • More than about 10 percentCorrect

    Why: For an infant, removing more than roughly a tenth of total blood volume at one time or over a short span is described as potentially life-threatening, which is a much smaller percentage than the threshold used for an adult. Fifty percent is far beyond the described threshold and would represent a catastrophic loss well past the point being asked about here. Two percent is too small a figure to match the described threshold, and the threshold is not simply 'any amount,' since ordinary testing draws are expected and accounted for. Primary reference: Phlebotomy Essentials, 8th Edition, Chapter 9, PDF p. 697.

16. Question 15

    Under CLSI standards, in what circumstance should the basilic vein be chosen for venipuncture?

    • Whenever it appears larger than the median cubital vein
    • Whenever the patient specifically requests that arm
    • Whenever the phlebotomist prefers it for personal comfort
    • Only after every other vein on both arms has been ruled outCorrect

    Why: Appearing larger does not override the caution, since the basilic vein's size does not offset the added risk near the median nerve and brachial artery. Patient preference for a particular arm is not described as the deciding factor for choosing this specific vein. Phlebotomist comfort or convenience is likewise not the basis given for this standard. The stated CLSI guidance is that the basilic vein should be used only when no other vein anywhere on either arm can be safely accessed. Primary reference: Phlebotomy Essentials, 8th Edition, Chapter 6, PDF p. 416.

17. Question 16

    A urinalysis report lists a specific gravity result of 1.045. How does this compare to the normal reference range for urine specific gravity?

    • Specific gravity has no established reference range for urine
    • It is above the normal reference range of 1.005 to 1.030Correct
    • It is below the normal reference range of 1.005 to 1.030
    • It falls within the normal range of 1.005 to 1.030

    Why: Specific gravity is a measure of how concentrated a urine specimen is compared to water, and laboratories rely on an established normal range to judge whether a given result reflects typical hydration and kidney concentrating ability or falls outside what would be expected. A result well above the upper boundary of that established range indicates a specimen that is more concentrated than normal, which is a different finding than a result that falls below the range or one that sits comfortably inside it. Urine specific gravity is very much a value with a defined reference range, obtainable through more than one method in the laboratory. Primary reference: Phlebotomy Essentials, 8th Edition, Chapter 13, PDF p. 979.

18. Question 17

    After separating platelet-poor plasma, the leftover red cells in the light blue-top tube should generally be refrigerated for about how long in case factor mutation testing is later requested?

    • 1 weekCorrect
    • 1 hour
    • 1 month
    • 48 hours

    Why: Keeping the remaining cells refrigerated for roughly a week gives the laboratory a window to run an additional test, such as factor mutation analysis, if the ordering physician requests it after the initial plasma testing is complete, without having to redraw the patient. An hour is far too brief to serve this backup purpose. Forty-eight hours matches a different storage rule used elsewhere for molecular RNA plasma, not this leftover-cell retention period. A full month goes beyond the specific week-long window the text describes for this particular retention practice. Primary reference: Phlebotomy Essentials, 8th Edition, Chapter 12, PDF p. 948.

19. Question 18

    In a newborn, how deep is the skin-to-bone distance measured at the thickest portion of the last finger segment, and why does this make finger puncture unsafe at that age?

    • About 10 to 15 mm, which is actually too deep for any standard lancet to reach
    • As little as about 1.2 to 2.2 mm, shallow enough that the bone could easily be injuredCorrect
    • Exactly the same depth as an adult finger, so no special precaution is needed
    • It cannot be measured, so the risk is unknown

    Why: Measurements of newborn finger anatomy show only a very thin layer of tissue, roughly one to two millimeters, separating the skin from the bone even in the thickest part of the last segment, so a standard puncture depth could easily strike bone. This is far shallower than an adult finger, which is exactly why the same puncture technique cannot be used safely on a newborn. The depth is measurable and well documented, not unknown, and it is this specific measurement that drives the prohibition on newborn finger puncture. Primary reference: Phlebotomy Essentials, 8th Edition, Chapter 10, PDF p. 748.

20. Question 19

    A gauze pad used during a capillary puncture is now soaked with blood. How should the technician dispose of it?

    • In a biohazard container, since it is a contaminated itemCorrect
    • By rinsing it and reusing it for the next patient
    • By returning it to the supply cart for restocking
    • In the regular trash, along with the rest of the day's paperwork

    Why: Gauze that is actually soaked with blood is a contaminated, potentially infectious item and must go into a biohazard container so it is handled and disposed of according to infection-control requirements. This is different from equipment packaging or bandage wrappers, which are not contaminated and can go into regular trash. Reusing a used gauze pad on another patient, or simply putting it back on the supply cart, would both create a serious infection-control hazard. Primary reference: Phlebotomy Essentials, 8th Edition, Chapter 10, PDF p. 758.

21. Question 20

    The primary blood supply within a full-term newborn's heel skin lies at approximately what depth below the surface?

    • Between about 0.35 mm and 1.6 mm deepCorrect
    • Between about 10 mm and 20 mm deep
    • Right at the skin outer surface, essentially 0 mm deep
    • Spread evenly all the way down to the calcaneus

    Why: The richest concentration of capillaries in a newborn's heel skin sits within roughly the first two millimeters of tissue, well short of the calcaneus. This shallow location is why a puncture of about 2 mm or less can still reach adequate blood flow without needing to go any deeper. Going deeper than necessary only adds bone-injury risk without improving blood flow, since the useful capillary bed is already reached well before that depth. Primary reference: Phlebotomy Essentials, 8th Edition, Chapter 10, PDF p. 749.

22. Question 21

    A phlebotomist is choosing between a 21-gauge and a 23-gauge needle for a routine adult antecubital venipuncture with normal veins. Which statement about gauge is correct?

    • The 23-gauge needle has a noticeably larger lumen diameter than the 21-gauge needle does
    • The 21-gauge and 23-gauge needles have essentially identical internal lumen diameters
    • The 21-gauge needle has a larger lumen diameter than the 23-gauge needle, and is the standard choice for this drawCorrect
    • Gauge number has no real relationship to a needle's internal lumen diameter at all

    Why: Because gauge and diameter move in opposite directions, a lower gauge number like 21 corresponds to a larger lumen than a higher number like 23, and the 21-gauge needle is the accepted standard size for a routine draw from a normal adult vein. Claiming the higher-numbered 23-gauge needle is wider reverses the actual relationship. Gauge number is directly tied to diameter, so it is incorrect to say there is no relationship between them. A 21-gauge and a 23-gauge needle are different sizes, not identical. Primary reference: Phlebotomy Essentials, 8th Edition, Chapter 7, PDF p. 486.

23. Question 22

    STAT and panic value test results are typically reported directly to the physician or designated personnel by:

    • Posting the result on a public bulletin board
    • Waiting for the next scheduled batch report
    • Regular interoffice mail only
    • Phone or pager, as soon as possibleCorrect

    Why: Because these results may demand urgent clinical action, they are called in as soon as possible, typically by phone or pager, so a physician can respond right away rather than waiting to see the result later. Ordinary mail is far too slow for a result that may reflect a life-threatening situation. Posting a result on a public bulletin board would also violate patient confidentiality entirely, aside from being far too slow. Waiting for a scheduled batch report defeats the entire purpose of flagging a result as urgent in the first place. Primary reference: Phlebotomy Essentials, 8th Edition, Chapter 12, PDF p. 950.

24. Question 23

    A phlebotomist is collecting a blood culture set from an adult patient. Why is it important to collect close to the full recommended volume for this test rather than only a small amount?

    • Because a smaller volume causes the bottles to falsely register as contaminated
    • Because insurance billing for the test requires documentation of the exact draw volume
    • Because pathogen recovery increases with the volume of blood cultured, and adults need about 20 to 30 mL per setCorrect
    • Because the culture bottles cannot be processed at all unless completely full

    Why: Collecting timely specimens matters, but the single most important variable in actually finding the organism causing a bloodstream infection is how much blood is cultured, since the likelihood of recovering the pathogen rises as the volume drawn rises. For an adult, that translates to a target in the tens of milliliters split between the culture bottles rather than a token amount. Contamination and billing documentation are separate concerns unrelated to why the recommended volume specifically improves the odds of detecting the causative organism. Primary reference: Phlebotomy Essentials, 8th Edition, Chapter 11, PDF p. 811.

25. Question 24

    A condition that is routinely and consistently found among a specific population or region, without a sudden rise in cases, is described as:

    • a disease outbreak
    • an epidemic
    • an endemic conditionCorrect
    • a pandemic

    Why: A disease that is a steady, ongoing part of a given region or population, rather than a recent surge, fits this description best. A rapid, wide-reaching surge affecting many people across a community or region describes a much larger and faster event than a stable baseline pattern. A sudden jump in cases beyond what is normally seen in an area describes a change from the usual pattern, which is the opposite of a steady, routine presence. Something that has grown to affect multiple countries or continents is an even larger-scale event than either of those. Primary reference: Phlebotomy Essentials, 8th Edition, Chapter 3, PDF p. 196.

26. Question 25

    The International Organization for Standardization (ISO) is best described as:

    • An independent, nongovernmental body developing voluntary standards across many industries, including health careCorrect
    • A state-level licensing board that certifies individual phlebotomy technicians directly
    • A professional association exclusively for pathologists and clinical laboratory directors
    • A branch of the U.S. federal government that enforces mandatory laboratory testing rules nationwide

    Why: ISO is made up of international technical experts from many countries who work together, outside of any single government, to produce standards that businesses may voluntarily choose to adopt across a wide range of industries, health care included. It is not a U.S. federal enforcement body, since it is nongovernmental and international rather than a domestic regulatory agency. Its membership spans experts from many fields and countries, not a professional society limited to pathologists and laboratory directors. It also does not license or certify individual practitioners, which is a separate function handled by state boards or national certifying agencies. Primary reference: Phlebotomy Essentials, 8th Edition, Chapter 2, PDF p. 147.