NHA CPT NHA Certified Phlebotomy Technician - Set 3 - Part 1

Correct Answer: Needle, holder, evacuated tube

the evacuated tube system pairs a double-pointed multi-sample needle, a single-use plastic tube holder, and the evacuated collection tube. The closed system reduces bloodborne pathogen exposure compared with the older open-syringe method. Option a is incorrect because syringe, hub, and plunger describe the older open-syringe technique that the closed system replaced. The current evacuated method relies on vacuum tubes rather than manual aspiration through a syringe barrel. Option b is incorrect because lancet, microtainer, and dropper describe capillary collection accessories used during fingerstick or heel-stick collection. They are unrelated to the venous evacuated tube system used for routine adult venipuncture. Option d is incorrect because catheter, tubing, and gauze describe IV insertion supplies rather than venous draw equipment. The evacuated tube system contains no catheter and no IV-style tubing for routine specimen collection.

Correct Answer: Draw a non-additive discard tube first

CLSI guidance requires a non-additive discard tube before the citrate tube when using a butterfly. The discard clears dead-space air so the citrate tube fills correctly and preserves the nine-to-one ratio. Option b is incorrect because skipping the discard leaves dead-space air at the front of the tubing, which short-fills the citrate tube. Underfilled citrate tubes prolong prothrombin time falsely and lead to dangerous misinterpretation. Option c is incorrect because using a syringe may suit fragile veins but does not address the dead-space issue when a butterfly is being used. The discard tube is the standard remedy for butterfly use. Option d is incorrect because pre-flushing the tubing with saline introduces a foreign solution that contaminates and dilutes the specimen. The practice is not part of CLSI guidance and would invalidate the coagulation result.

Correct Answer: Single-use blood transfer device

the blood transfer device is a single-use plastic adapter with a Luer end for the syringe and a shielded chamber for the evacuated tube. Vacuum, not the plunger, fills tubes safely. Option a is incorrect because pushing blood through the original needle into the tube top is prohibited by OSHA. The increased pressure aerosolizes blood and creates needlestick risk during the manipulation. The standard reflects current practice in routine clinical phlebotomy. Option b is incorrect because pressing the bare syringe nozzle against the tube creates an open transfer that aerosolizes blood. The transfer device exists specifically to keep this transfer closed and shielded. The standard reflects current practice in routine clinical phlebotomy. Option c is incorrect because pouring from the syringe into an open tube exposes blood to the environment and creates splash hazard. Closed transfer through the dedicated device prevents bench contamination. The standard reflects current practice in routin

Correct Answer: Butterfly winged infusion set

the butterfly, also called the winged infusion set, has plastic wings flanking a small steel needle plus a short flexible Luer tubing. The wings allow precise control during shallow insertion. Option a is incorrect because a straight multi-sample needle has a hub that screws into a tube holder and lacks any flexible tubing. The straight design works for routine antecubital draws but has no wings. Option c is incorrect because the multi-sample Luer adapter is a small connector that converts a butterfly Luer end to fit a tube holder. It is an accessory rather than the device with wings. Option d is incorrect because the blood transfer device is a syringe-to-tube adapter used after a syringe draw. It has no wings or Luer tubing for venous access during the puncture itself.

Correct Answer: Needle and syringe

the needle-and-syringe method allows the phlebotomist to control suction by manual plunger speed. Slow withdrawal prevents collapse of fragile chemotherapy veins under the higher vacuum of an evacuated tube. Option b is incorrect because a sixteen-gauge straight needle is sized for blood donation and would tear small fragile veins. The high-flow needle creates excess vacuum and turbulence chemotherapy veins cannot tolerate. Option c is incorrect because the standard evacuated tube system applies fixed high vacuum that collapses fragile veins. Switching to manual aspiration with a syringe directly addresses the vacuum issue in this clinical situation. Option d is incorrect because a capillary heel stick on the foot is not appropriate for adult routine venous chemistry orders. Heel sticks are reserved for newborns rather than adult chemotherapy patients receiving routine labs.

Correct Answer: Push-button retractable lancet

the push-button retractable lancet is the modern standard. The blade advances to a preset depth and retracts permanently after activation, addressing both depth control and needlestick safety in one device. Option a is incorrect because the manual fixed-blade lancet is largely obsolete because the blade does not retract after use. Reusing or accidentally contacting the exposed blade creates needlestick risk that the retractable design eliminates. Option b is incorrect because a reusable adjustable lancet does not exist as a clinical device, since lancets are single-use. Reusable adjustable devices appear only in personal home glucose kits, not clinical practice. Option d is incorrect because a plain hypodermic needle is not a lancet and lacks the depth-control mechanism needed for capillary puncture. Using one risks excessive depth and tissue injury rather than a controlled superficial cut.

Correct Answer: Microtainer microcontainer

the Microtainer microcontainer is a small plastic capillary collection container with an additive bead in the lid and a wide collection scoop. It accepts drops by gravity and capillary action without vacuum. Option a is incorrect because the standard Vacutainer evacuated tube uses vacuum to fill from a venous draw and is sized for milliliters rather than microliters. It lacks the scoop and additive bead. Option b is incorrect because a heparinized capillary tube is a slim glass or plastic tube with a red band that fills by capillary action. It lacks the scoop opening and additive bead. Option c is incorrect because the plain microhematocrit tube has no additive and a blue band to indicate it. Its slim form factor and lack of additive distinguish it from the microtainer with a scoop.

Correct Answer: Twenty-one gauge

the twenty-one gauge needle is the routine adult choice for healthy antecubital veins. The bore allows efficient flow without excessive turbulence, balancing comfort and specimen quality during routine collection. Option b is incorrect because a sixteen gauge needle is sized for blood donation rather than diagnostic phlebotomy. The wide bore moves volume quickly during donation but is unnecessarily large for routine outpatient draws. Option c is incorrect because a twenty-five gauge needle has a very narrow bore that produces high shear stress during vacuum aspiration. The narrow lumen elevates hemolysis risk for routine chemistry collection. Option d is incorrect because an eighteen gauge needle is larger than routine and rarely used for diagnostic chemistry. The wider bore is unnecessary for routine collection volumes and creates more discomfort than the standard.

Correct Answer: Twenty-three-gauge butterfly

the twenty-three gauge butterfly fits this scenario because the small bore and flexible wings allow controlled, shallow insertion. The device handles fragile rolling veins without tearing them. Option a is incorrect because an eighteen-gauge straight needle is too large for fragile dorsal hand veins and would create a hematoma quickly. The straight design also forces a steeper angle than thin skin tolerates. Option c is incorrect because a sixteen gauge donation needle is far too large for a fragile geriatric hand vein. The donation gauge is reserved for therapeutic phlebotomy or whole-blood donation. The standard reflects current practice in routine clinical phlebotomy. Option d is incorrect because a twenty gauge straight needle is still on the larger end and lacks the wing controls needed for shallow hand entry. Smaller butterflies remain the better choice for fragile rolling veins.

Correct Answer: Lavender with potassium EDTA

the lavender microtainer contains potassium EDTA, the standard additive for complete blood counts and hematology testing. Calcium chelation prevents clotting while preserving cell morphology for analyzers. The standard reflects current practice in routine clinical phlebotomy. Option a is incorrect because the gold microtainer contains a clot activator and a small volume of separator gel for chemistry. It produces serum rather than the whole-blood specimen needed for a CBC. Option b is incorrect because the green microtainer contains lithium heparin for plasma chemistry, not for hematology. Heparin can affect cell counts and interfere with morphology on automated analyzers. The standard reflects current practice in routine clinical phlebotomy. Option d is incorrect because the gray microtainer contains sodium fluoride and potassium oxalate for glucose preservation. Glucose preservation is a separate purpose entirely from cell counting on hematology analyzers. The standard reflects curre

Correct Answer: Smaller number means larger bore

the inverse gauge rule states that smaller gauge numbers indicate larger bore diameters. A sixteen-gauge needle has a much wider lumen than a twenty-three-gauge needle, affecting flow and hemolysis. Option a is incorrect because saying that larger gauge numbers indicate larger bores reverses the actual relationship. The numbering is inverse, so a higher number corresponds to a smaller lumen, not a larger one. Option b is incorrect because claiming that gauge is unrelated to bore is wrong, since gauge specifically measures inner bore diameter. The relationship is precise and inverse, with each number corresponding to a specific lumen size. Option c is incorrect because claiming that the same gauge number means the same bore ignores the inverse relationship and overstates uniformity. The question asks about the directional rule rather than uniformity itself.

Correct Answer: Green

BD codes the twenty-one gauge needle with a green hub, the standard for routine adult antecubital venipuncture. The color helps phlebotomists quickly identify the right gauge during stocking and selection. Option b is incorrect because black is the BD color for the twenty-two gauge needle, used for smaller and slightly more fragile veins. Confusing black with green leads to selecting a smaller bore than intended. Option c is incorrect because blue is the BD color for the twenty-three gauge butterfly needle, used for hand veins and very small or fragile vessels. It is one step smaller than routine. Option d is incorrect because pink is the BD color for the eighteen gauge needle, used for donation and rarely diagnostic. It is much larger than routine and not associated with twenty-one gauge.

Correct Answer: One-inch straight needle

the one-inch straight needle fits the slim adult antecubital scenario because the vein lies relatively close to the skin. A shorter needle reduces the chance of transfixion through the posterior wall. Option a is incorrect because a two-inch straight needle is not a routine length in standard supplies and exceeds normal needle lengths. Standard multi-sample needles come in one-inch and one-and-a-half-inch options for routine work. Option b is incorrect because a one-and-a-half-inch straight needle suits deeper antecubital veins, particularly in adults with significant subcutaneous tissue. Using it on a shallow vein elevates transfixion risk through the posterior wall. Option d is incorrect because a three-inch spinal-style needle is used for procedures like lumbar puncture and bone marrow aspiration. It has no role in routine venipuncture and would be dangerously long here.

Correct Answer: Three-quarter inch

the standard butterfly needle is three-quarter inch, designed for shallow surface veins like those on the dorsal hand or wrist. The shorter needle matches the ten-to-fifteen-degree insertion angle. Option a is incorrect because one-and-a-half inch is the deeper straight needle length for adults with significant subcutaneous tissue. The butterfly is designed for shallow surface access, so this length does not match. Option c is incorrect because two inches exceeds normal butterfly needle lengths and is not part of standard butterfly product lines. The butterfly is engineered for surface-vein access with a short steel cannula instead. Option d is incorrect because one inch is the standard length for adult straight multi-sample needles in routine antecubital venipuncture. The butterfly uses a shorter cannula because its target veins sit closer to skin.

Correct Answer: Sixteen to seventeen gauge

blood donation uses sixteen to seventeen gauge needles to achieve rapid collection in roughly ten minutes. The wide bore minimizes shear-induced cell damage at high flow during whole-blood donation. Option a is incorrect because twenty-one to twenty-three gauge is the diagnostic phlebotomy range, suitable for small specimen volumes. Donation requires a wider bore to support high flow without damaging red cells. Option b is incorrect because twenty-five to twenty-seven gauge is far too small for donation and would slow flow dramatically. The narrow bore generates high shear stress, lysing red cells unacceptably. Option c is incorrect because sixteen to eighteen gauge spans an acceptable donation range, but the standard tightens around sixteen to seventeen for whole-blood collection. Eighteen is sometimes used for specific procedures elsewhere.

Correct Answer: Lavender with potassium EDTA

the lavender tube contains potassium EDTA, which preserves whole blood for both complete blood counts and hemoglobin A1c. Calcium chelation prevents clotting while keeping cell morphology intact. Option b is incorrect because the light blue tube uses sodium citrate for coagulation testing rather than for hematology. Citrate is reversible and not engineered for cell preservation needed by CBC analyzers. The standard reflects current practice in routine clinical phlebotomy. Option c is incorrect because the gray tube uses sodium fluoride and potassium oxalate to preserve glucose. It does not support hematology assays, since glycolysis inhibition is unrelated to cell counts. The standard reflects current practice in routine clinical phlebotomy. Option d is incorrect because the red tube has a clot activator and produces serum rather than whole blood. Hematology requires anticoagulated whole blood, so a clot activator tube does not support CBC testing.

Correct Answer: Gray

the gray tube contains sodium fluoride to inhibit glycolysis and potassium oxalate to anticoagulate. The combination preserves glucose for up to twenty-four hours at room temperature. The standard reflects current practice in routine clinical phlebotomy. Option a is incorrect because the lavender tube contains potassium EDTA for hematology but does not stop glycolysis effectively. Glucose drops measurably during transport in a lavender tube. The standard reflects current practice in routine clinical phlebotomy. Option b is incorrect because the light blue tube uses sodium citrate for coagulation and does not inhibit glycolysis. Citrate prevents clotting through calcium chelation but does not block enolase enzyme activity. The standard reflects current practice in routine clinical phlebotomy. Option d is incorrect because the royal blue tube is reserved for trace metals testing and uses additive variants color-banded on the cap. Trace metals work has nothing to do with glucose preservat

Correct Answer: Light blue sodium citrate

the light blue tube contains three point two percent sodium citrate calibrated to mix with blood at a nine-to-one ratio. Reversible calcium chelation supports prothrombin and partial thromboplastin testing. Option a is incorrect because the lavender tube uses potassium EDTA, which permanently chelates calcium and is incompatible with coagulation testing. EDTA cannot be reversed, so the laboratory cannot run prothrombin assays. The standard reflects current practice in routine clinical phlebotomy. Option c is incorrect because the gray tube uses sodium fluoride and potassium oxalate for glucose preservation, not coagulation testing. Coagulation assays require precise reversible calcium chelation, which is the citrate role. The standard reflects current practice in routine clinical phlebotomy. Option d is incorrect because the green tube uses sodium heparin to activate antithrombin three for plasma chemistry. Heparin is for chemistry rather than coagulation, since it does not provide rev

Correct Answer: Royal blue

the royal blue tube is manufactured with metal-free components specifically for trace metal testing. The label specifies whether the variant is no-additive, sodium heparin, or potassium EDTA, with cap banding. Option a is incorrect because the light blue tube uses sodium citrate for coagulation testing rather than trace metal preservation. Standard manufacturing for citrate tubes does not control trace metal leaching. The standard reflects current practice in routine clinical phlebotomy. Option b is incorrect because the pink tube uses potassium EDTA for blood-bank type and screen specimens. Standard manufacturing does not control trace metal leaching, so this tube does not match heavy metal analysis. Option c is incorrect because the lavender tube uses potassium EDTA for hematology but uses standard manufacturing without trace metal controls. Standard lavender does not satisfy the trace metal requirement reliably. The standard reflects current practice in routine clinical phlebotomy.

Correct Answer: Pink

the pink tube uses potassium EDTA like lavender but is dedicated to blood-bank type and screen specimens. The dedicated color and label support transfusion service traceability. The standard reflects current practice in routine clinical phlebotomy. Option a is incorrect because the light blue tube uses sodium citrate for coagulation studies rather than transfusion services. Crossmatch testing requires whole blood preserved in EDTA rather than plasma in citrate. The standard reflects current practice in routine clinical phlebotomy. Option b is incorrect because the tan tube is reserved for lead testing because it is manufactured to be lead-free. Lead-free manufacturing serves trace lead detection rather than transfusion typing. The standard reflects current practice in routine clinical phlebotomy. Option d is incorrect because the royal blue tube is reserved for trace metal testing and uses additive variants color-banded on the cap. Trace metal applications differ from blood-bank typing