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Blood Collection Equipment and Supplies Flashcards

7 cards from real Phlebotomy Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Blood Collection Equipment and Supplies flashcards as text

  1. What is the standard needle gauge most commonly used for routine adult venipuncture?

    Answer: 21 gauge

    The 21-gauge needle is the standard for routine adult venipuncture, providing adequate blood flow without causing excessive hemolysis.

  2. Which evacuated tube color contains EDTA as its anticoagulant and is most commonly used for CBC testing?

    Answer: Lavender/purple

    Lavender/purple top tubes contain EDTA, which chelates calcium to prevent clotting and is the additive of choice for hematology tests like CBCs.

  3. What is the primary purpose of applying a tourniquet during venipuncture?

    Answer: To distend veins by restricting venous blood flow

    A tourniquet restricts venous return, causing veins to distend and become more visible and palpable for easier needle access.

  4. What is the maximum recommended time a tourniquet should remain applied during venipuncture?

    Answer: 1 minute

    A tourniquet should not remain applied for more than 1 minute because prolonged application causes hemoconcentration, which can falsely elevate cell counts and large-molecule analytes.

  5. Which antiseptic is most commonly used to cleanse the venipuncture site for routine blood collection?

    Answer: 70% isopropyl alcohol

    70% isopropyl alcohol is the standard antiseptic for routine venipuncture; it must be allowed to air dry completely before needle insertion to prevent hemolysis and inaccurate results.

  6. What gauge needle is most commonly used with a butterfly (winged infusion) set for small or fragile hand veins?

    Answer: 23 gauge

    A 23-gauge butterfly needle is preferred for small, fragile, or difficult veins such as hand veins because its smaller diameter causes less trauma to delicate vessels.

  7. What is the primary advantage of the evacuated tube (Vacutainer) system over a syringe for routine venipuncture?

    Answer: It allows multiple tube collection from one venipuncture using pre-vacuumed tubes

    The evacuated tube system uses pre-vacuumed tubes that automatically draw the correct blood volume, enabling multiple samples from a single venipuncture by simply changing tubes.