CCMA Phlebotomy Practice Test

25 practice questions

Choose an answer, then check it under Show answer.

1. Question 1 of 25Easy

   A light blue tube contains sodium citrate. For which type of testing is this tube primarily used?

   1. AA. Complete blood count
   2. BB. Coagulation studies
   3. CC. Blood type and crossmatch
   4. DD. Blood glucose testing
   Show answer to question 1

   Answer: B. Coagulation studies

   Sodium citrate binds calcium in a reversible way, which preserves clotting factors for coagulation tests such as PT, INR and aPTT.

   Why the other options are wrong

   • AA CBC is collected in a lavender EDTA tube.
   • CBlood bank testing usually uses a pink or lavender EDTA tube, depending on the laboratory.
   • DGlucose is preserved in a gray tube containing a glycolytic inhibitor.

2. Question 2 of 25Medium

   A medical assistant has made two unsuccessful venipuncture attempts on a patient. What is the most appropriate next step?

   1. AA. Try a third time in the same arm with a larger needle
   2. BB. Tell the patient to return another day for a new attempt
   3. CC. Ask the patient which spot worked best in the past
   4. DD. Ask another qualified person to perform the draw
   Show answer to question 2

   Answer: D. Ask another qualified person to perform the draw

   A common standard is that a collector should not attempt venipuncture more than twice on the same patient. After two unsuccessful attempts, another qualified person should try, and the provider is notified if collection is still unsuccessful.

   Why the other options are wrong

   • AA third attempt by the same person adds discomfort and risk.
   • BDelaying collection may postpone needed results when another qualified person is available.
   • CPatient input can help, but it does not replace the standard of stopping after two attempts.

3. Question 3 of 25Medium

   A patient who receives hemodialysis has an arteriovenous fistula in the left forearm. Where should the medical assistant perform the venipuncture?

   1. AA. Directly above the fistula, where veins are enlarged
   2. BB. In the left hand, below the fistula site
   3. CC. In the right arm, away from the fistula
   4. DD. In the fistula itself, which is easy to reach
   Show answer to question 3

   Answer: C. In the right arm, away from the fistula

   An arm with a dialysis fistula or graft is not used for venipuncture because damage can cause clotting or infection of the access. The medical assistant uses the other arm, following facility policy.

   Why the other options are wrong

   • APuncturing near the fistula risks damaging the patient's dialysis access.
   • BThe hand on the fistula side is part of the same limb and should not be used.
   • DFistulas are accessed only by trained dialysis staff for treatment.

4. Question 4 of 25Medium

   To save time, a medical assistant wants to label all tubes before drawing a patient's blood. What is the correct practice?

   1. AA. Pre-label tubes so they are ready when the needle is in
   2. BB. Label tubes later at the processing station in a batch
   3. CC. Label tubes at the chairside right after collection
   4. DD. Label only the first tube and band the others to it
   Show answer to question 4

   Answer: C. Label tubes at the chairside right after collection

   Tubes are labeled immediately after collection, in the patient's presence, before the medical assistant leaves the collection area. This links each specimen to the identified patient and prevents mislabeling.

   Why the other options are wrong

   • APre-labeled tubes may be used for the wrong patient or left unfilled, which increases labeling errors.
   • BLabeling later, away from the patient, increases the risk of mix-ups.
   • DEvery tube must carry its own label with the required patient identifiers.

5. Question 5 of 25Easy

   How far above the intended venipuncture site should the tourniquet be applied?

   1. AA. About 1 inch
   2. BB. Directly over the site
   3. CC. About 6 to 8 inches
   4. DD. About 3 to 4 inches
   Show answer to question 5

   Answer: D. About 3 to 4 inches

   A tourniquet is placed about 3 to 4 inches (7.5 to 10 cm) above the site. This distance makes veins more prominent without getting in the way of the needle.

   Why the other options are wrong

   • AOne inch is too close and can interfere with needle insertion and site cleansing.
   • BA tourniquet over the site would block access and contaminate the cleansed area.
   • CA tourniquet placed that far away may not enlarge the veins enough at the site.

6. Question 6 of 25Easy

   Which tube is manufactured to be free of trace metal contamination for tests such as zinc levels?

   1. AA. Light green top
   2. BB. Gray top
   3. CC. Royal blue top
   4. DD. Pink top
   Show answer to question 6

   Answer: C. Royal blue top

   Royal blue tubes are made to be free of trace metals, so they are used for tests such as zinc and other trace elements. The additive varies, so the laboratory specifies which royal blue tube to use.

   Why the other options are wrong

   • ALight green tubes contain lithium heparin and gel for plasma chemistry tests.
   • BGray tubes contain a glycolytic inhibitor for glucose testing.
   • DPink tubes contain EDTA and are used mainly for blood bank testing.

7. Question 7 of 25Hard

   A laboratory technologist rejects an EDTA tube submitted for a complete blood count because microclots were detected in the specimen. Which of the following errors by the medical assistant caused this rejection?

   1. AA. Using a 21-gauge multisample needle for collection
   2. BB. Inverting the collection tube only once after the draw
   3. CC. Storing the whole blood sample upright at room temperature
   4. DD. Waiting ten minutes before sending the tube to the laboratory
   Show answer to question 7

   Answer: B. Inverting the collection tube only once after the draw

   EDTA tubes must be gently inverted 8 to 10 times immediately after collection to thoroughly distribute the anticoagulant and prevent the formation of microclots. Using a standard 21-gauge needle does not cause clotting, and whole blood samples for hematology are routinely kept at room temperature prior to testing.

8. Question 8 of 25Medium

   A medical assistant used a syringe to collect blood from a fragile vein. How should the blood be transferred into evacuated tubes?

   1. AA. Use a safety transfer device and let the vacuum fill each tube
   2. BB. Remove the stopper and squirt the blood into the tube
   3. CC. Push the syringe needle through the stopper and force the plunger
   4. DD. Pour the blood from the syringe into an open tube
   Show answer to question 8

   Answer: A. Use a safety transfer device and let the vacuum fill each tube

   A blood transfer device lets the tube's vacuum draw blood from the syringe without exposing the medical assistant to the needle. Letting the vacuum fill each tube prevents hemolysis and keeps the blood-to-additive ratio correct.

   Why the other options are wrong

   • BRemoving stoppers exposes the specimen and staff, and it changes the fill volume.
   • CPushing a needle through a stopper risks a needlestick, and forcing the plunger can hemolyze cells.
   • DPouring blood risks spills and exposure and gives incorrect tube volumes.

9. Question 9 of 25Easy

   Which needle gauge is most commonly used for routine adult venipuncture?

   1. AA. 16 gauge
   2. BB. 18 gauge
   3. CC. 21 gauge
   4. DD. 25 gauge
   Show answer to question 9

   Answer: C. 21 gauge

   A 21-gauge needle is the standard for routine adult venipuncture. Gauge numbers run opposite to size, so a higher number means a smaller needle opening.

   Why the other options are wrong

   • AA 16-gauge needle is very large and is used for blood donation, not routine draws.
   • BAn 18-gauge needle is larger than needed and is not typically used for routine collection.
   • DA 25-gauge needle is very small and can hemolyze specimens or slow blood flow.

10. Question 10 of 25Medium

    A medical assistant will draw a PT, a basic metabolic panel in a gold serum separator tube and a CBC. In what order should the tubes be filled?

    1. AA. Gold, light blue, lavender
    2. BB. Lavender, gold, light blue
    3. CC. Light blue, gold, lavender
    4. DD. Light blue, lavender, gold
    Show answer to question 10

    Answer: C. Light blue, gold, lavender

    In the CLSI order of draw, the citrate tube for coagulation comes first, followed by serum tubes, then heparin, then EDTA. The correct sequence here is light blue, gold, then lavender.

    Why the other options are wrong

    • ADrawing a serum tube before the citrate tube risks clot activator carryover into the coagulation specimen.
    • BDrawing EDTA first can carry additive into the other tubes and alter results.
    • DEDTA must come after serum tubes to prevent EDTA carryover into the chemistry specimen.

11. Question 11 of 25Medium

    A patient who takes an anticoagulant has just had blood drawn. What should the medical assistant do before applying a bandage?

    1. AA. Hold pressure longer and check that bleeding stopped
    2. BB. Apply the bandage right away so the patient can leave
    3. CC. Wrap the arm tightly with tape to stop any bleeding
    4. DD. Ask the patient to massage the site to help clotting
    Show answer to question 11

    Answer: A. Hold pressure longer and check that bleeding stopped

    Patients on anticoagulants may bleed longer after venipuncture. The medical assistant holds pressure longer and confirms that bleeding has completely stopped before bandaging, and reports continued bleeding to the provider.

    Why the other options are wrong

    • BBandaging too soon can let bleeding continue under the bandage and form a hematoma.
    • CA tight wrap can impair circulation and is not a substitute for direct pressure.
    • DMassaging the site disrupts clot formation and increases bruising.

12. Question 12 of 25Medium

    A patient's hands are cold before a fingerstick. Which action will best improve blood flow to the site?

    1. AA. Warm the site with a warm compress
    2. BB. Squeeze the finger firmly before the puncture
    3. CC. Rub alcohol on the fingertip for a full minute
    4. DD. Ask the patient to hold the hand above the head
    Show answer to question 12

    Answer: A. Warm the site with a warm compress

    Warming the site for a few minutes with a warm compress or approved warming device increases blood flow to the capillary bed. This makes collection easier without altering the specimen.

    Why the other options are wrong

    • BSqueezing or milking the finger adds tissue fluid and can hemolyze the sample.
    • CRubbing alcohol does not warm the site and can cause hemolysis if not dry.
    • DRaising the hand reduces blood flow; holding it down helps.

13. Question 13 of 25Medium

    While preparing for a venipuncture, a medical assistant notices that one evacuated tube expired last month. What is the main concern with using it?

    1. AA. The stopper color may no longer match the additive
    2. BB. Its vacuum or additive may have degraded
    3. CC. It will always hemolyze the specimen
    4. DD. It may cause an allergic reaction in the patient
    Show answer to question 13

    Answer: B. Its vacuum or additive may have degraded

    Expired tubes may have lost vacuum, which causes short draws, and their additives may have degraded. Either problem can produce inaccurate results, so expired tubes are discarded.

    Why the other options are wrong

    • AStopper colors do not change with age; the concern is loss of vacuum and additive function.
    • CExpiration does not automatically cause hemolysis; the main risks are short draws and degraded additives.
    • DExpired tubes do not cause allergic reactions; the problem is inaccurate results.

14. Question 14 of 25Hard

    Partway through a venipuncture, a seated patient says she feels faint, and her face becomes pale and sweaty. What should the medical assistant do first?

    1. AA. Stop the draw and protect her from falling
    2. BB. Finish filling the tubes before she loses consciousness
    3. CC. Hold an ammonia inhalant under her nose and keep drawing
    4. DD. Have her stand up and walk to the restroom for water
    Show answer to question 14

    Answer: A. Stop the draw and protect her from falling

    At the first sign of fainting, the venipuncture is stopped: the tourniquet is released, the needle is removed and pressure is applied while the patient is protected from falling. She lowers her head or lies down, and help is called per policy.

    Why the other options are wrong

    • BContinuing the draw risks injury if the patient loses consciousness with a needle in her arm.
    • CAmmonia inhalants are not recommended and can cause harmful reactions.
    • DStanding and walking increases the risk of a fall and injury.

15. Question 15 of 25Medium

    A provider orders a trough level for a patient whose medication blood level is being monitored. When should the medical assistant collect the specimen?

    1. AA. Right after the patient takes the next dose
    2. BB. At any convenient time during the day
    3. CC. One hour after the dose is fully absorbed
    4. DD. Shortly before the next scheduled dose
    Show answer to question 15

    Answer: D. Shortly before the next scheduled dose

    A trough level is the lowest concentration of a drug in the blood, which occurs just before the next scheduled dose. The exact collection time is recorded so the provider can interpret the result.

    Why the other options are wrong

    • ACollecting right after a dose measures a rising level, not the trough.
    • BDrug levels change during the dosing cycle, so timing must match the order.
    • CA specimen taken after absorption reflects a level near the peak, not the trough.

16. Question 16 of 25Hard

    During a venipuncture, a medical assistant notices swelling forming rapidly around the needle while blood is still flowing into the tube. What should the medical assistant do?

    1. AA. Push the needle deeper to reach the center of the vein
    2. BB. Finish filling all tubes, then apply a bandage
    3. CC. Move the needle side to side to find better flow
    4. DD. Release the tourniquet, withdraw, and apply pressure
    Show answer to question 16

    Answer: D. Release the tourniquet, withdraw, and apply pressure

    Rapid swelling indicates a hematoma, meaning blood is leaking into the tissue. The procedure is stopped: the tourniquet is released, the needle is removed and firm pressure is applied to the site.

    Why the other options are wrong

    • APushing deeper may pierce the back wall of the vein and worsen bleeding into the tissue.
    • BContinuing the draw lets the hematoma grow and can compress nearby nerves.
    • CMoving the needle side to side causes tissue damage and is not an acceptable technique.

17. Question 17 of 25Easy

    How does plasma differ from serum?

    1. AA. Plasma contains fibrinogen; serum does not
    2. BB. Serum contains clotting factors; plasma does not
    3. CC. Plasma is obtained only from clotted blood
    4. DD. Serum is collected only in tubes with EDTA
    Show answer to question 17

    Answer: A. Plasma contains fibrinogen; serum does not

    Plasma is the liquid portion of blood collected in an anticoagulant tube, so it still contains fibrinogen. Serum is the liquid left after blood clots, and its fibrinogen has been used up in forming the clot.

    Why the other options are wrong

    • BPlasma keeps its clotting factors because the blood never clots in the tube.
    • CPlasma comes from anticoagulated blood, while serum comes from clotted blood.
    • DEDTA is an anticoagulant, so EDTA tubes produce whole blood or plasma, not serum.

18. Question 18 of 25Hard

    A medical assistant collects only 1 mL of blood into a standard 4 mL lavender top (EDTA) tube. Which of the following laboratory artifacts is most likely to occur due to this underfill?

    1. AA. Prolongation of the prothrombin time
    2. BB. Spontaneous cellular lysis from hypotonicity
    3. CC. Falsely elevated blood glucose levels
    4. DD. Erythrocyte shrinkage and altered morphology
    Show answer to question 18

    Answer: D. Erythrocyte shrinkage and altered morphology

    An underfilled EDTA tube produces an excess concentration of anticoagulant relative to the volume of blood, creating a hypertonic environment that draws water out of erythrocytes and causes them to shrink (crenate). This cellular shrinkage falsely decreases the hematocrit and distorts red blood cell morphology on a stained smear.

19. Question 19 of 25Medium

    How should a medical assistant anchor an antecubital vein before inserting the needle?

    1. AA. Pull the skin taut with the thumb 1 to 2 inches below
    2. BB. Place one finger above and one below the site in a C shape
    3. CC. Press firmly on the vein directly over the insertion point
    4. DD. Ask the patient to pump a fist while the skin is pulled up
    Show answer to question 19

    Answer: A. Pull the skin taut with the thumb 1 to 2 inches below

    The vein is anchored by placing the thumb 1 to 2 inches below the site and pulling the skin taut toward the hand. This keeps the vein from rolling and keeps the fingers out of the needle's path.

    Why the other options are wrong

    • BThe two-finger method places a finger in the needle's path and increases the risk of a needlestick.
    • CPressing on the insertion point flattens the vein and contaminates the cleansed site.
    • DFist pumping can alter test results and does not anchor the vein.

20. Question 20 of 25Medium

    A medical assistant must perform a venipuncture on an 88-year-old woman whose only accessible veins are small, fragile veins on the back of her hand. Which equipment is most appropriate?

    1. AA. An 18-gauge needle on a tube holder
    2. BB. A 21-gauge needle with large tubes
    3. CC. A 16-gauge needle and a syringe
    4. DD. A 23-gauge winged collection set
    Show answer to question 20

    Answer: D. A 23-gauge winged collection set

    A winged (butterfly) set with a 23-gauge needle gives better control in small, fragile hand veins. Small-volume tubes or a gentle syringe pull reduce the chance of collapsing the vein.

    Why the other options are wrong

    • AAn 18-gauge needle is too large for small, fragile hand veins.
    • BLarge tubes have strong vacuum that can collapse small veins.
    • CA 16-gauge needle is far too large for a fragile vein and would cause unnecessary trauma.

21. Question 21 of 25Hard

    As the needle enters the vein, the patient reports a sharp, electric-shock pain shooting down her forearm. What should the medical assistant do?

    1. AA. Ask her to hold still while the tubes finish filling
    2. BB. Stop and remove the needle immediately
    3. CC. Redirect the needle slightly to a deeper position
    4. DD. Tell her the feeling is normal and will pass soon
    Show answer to question 21

    Answer: B. Stop and remove the needle immediately

    Shooting, electric or tingling pain suggests the needle has contacted a nerve. The tourniquet is released and the needle removed at once to prevent lasting injury, and the event is documented and reported.

    Why the other options are wrong

    • AContinuing the draw can worsen nerve damage.
    • CRedirecting the needle may cause further nerve injury.
    • DElectric pain is not a normal venipuncture sensation and requires immediate action.

22. Question 22 of 25Easy

    How should a medical assistant mix an evacuated tube that contains an additive immediately after it is filled?

    1. AA. Shake it vigorously for 10 seconds
    2. BB. Gently invert it as directed
    3. CC. Roll it between the palms for 2 minutes
    4. DD. Leave it upright without mixing
    Show answer to question 22

    Answer: B. Gently invert it as directed

    Additive tubes are mixed by gently inverting them the number of times recommended by the tube manufacturer. This distributes the additive evenly without damaging the cells.

    Why the other options are wrong

    • AVigorous shaking can hemolyze the specimen.
    • CRolling is not the standard mixing method and may not mix the additive properly.
    • DAdditive tubes left unmixed may clot or give inaccurate results.

23. Question 23 of 25Hard

    A provider orders a lithium level for a patient who takes lithium for bipolar disorder. Which tube would most likely cause a falsely elevated result?

    1. AA. Red tube with no additive
    2. BB. Light blue sodium citrate tube
    3. CC. Lavender K2EDTA tube
    4. DD. Green lithium heparin tube
    Show answer to question 23

    Answer: D. Green lithium heparin tube

    Lithium heparin tubes contain lithium, which can contaminate the specimen and falsely raise a lithium level. Lithium levels are usually collected in a serum tube as directed by the laboratory.

    Why the other options are wrong

    • AA plain red tube adds no lithium and is commonly used for serum drug levels.
    • BCitrate does not contain lithium; it is used mainly for coagulation tests.
    • CK2EDTA contains potassium, not lithium, so it would not raise a lithium result.

24. Question 24 of 25Easy

    Which vein is usually the first choice for venipuncture because it is large, well anchored and away from major nerves?

    1. AA. Basilic vein
    2. BB. Median cubital vein
    3. CC. Cephalic vein
    4. DD. Dorsal hand vein
    Show answer to question 24

    Answer: B. Median cubital vein

    The median cubital vein is the preferred site because it is usually large, close to the surface, well anchored and less likely to lie near nerves or arteries. The cephalic vein is the next choice.

    Why the other options are wrong

    • AThe basilic vein is used only after other antecubital veins are ruled out, so it is not the first choice.
    • CThe cephalic vein is acceptable but is usually the second choice because it can be harder to find and anchor.
    • DHand veins are used when antecubital veins are not accessible, not as the first choice.

25. Question 25 of 25Hard

    A medical assistant is using a winged (butterfly) collection set to draw only a PT/INR in a light blue tube. What should be done before filling the light blue tube?

    1. AA. Fill the light blue tube twice and pour them together
    2. BB. Draw a gold serum tube first to clear the tubing
    3. CC. Draw a discard tube to fill the air space in the tubing
    4. DD. Tap the tube firmly to release any trapped air bubbles
    Show answer to question 25

    Answer: C. Draw a discard tube to fill the air space in the tubing

    The tubing of a winged set contains air. When a citrate tube is the first tube drawn, a discard tube is collected first so the air does not cause an underfilled light blue tube and an incorrect blood-to-anticoagulant ratio.

    Why the other options are wrong

    • APooling blood from two tubes is not acceptable and does not correct the additive ratio.
    • BA clot activator tube drawn first could contaminate the coagulation specimen; the discard tube should be nonadditive or citrate.
    • DTapping the tube does not remove air from the tubing or correct an underfilled tube.

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