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CPT — Certified Phlebotomy Technician (NHA)

Prepare for CPT — Certified Phlebotomy Technician (NHA) with practice questions covering 38 topics. Build your knowledge, track your progress, and study effectively with AH Prep.

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6 units

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A few questions from this module, with the answer and a full explanation. The complete bank is available when you start practising.

  1. A phlebotomist inadvertently punctures the brachial artery during an antecubital draw. Blood fills the vacuum tube very rapidly and appears brighter than expected. The tube fills in under 10 seconds without any syringe plunger action. Which combination of physiological mechanisms explains both the speed of filling and the blood colour?

    • Bright colour alone confirms arterial entry; venous blood is dark red because peripheral haemoglobin is fully deoxygenated by tissue metabolism
    • Arterial blood does not fill vacuum tubes faster than venous blood; the rapid fill reflects a defect in the tube's vacuum seal
    • The brachial artery operates under high systolic pressure (approximately 80–120 mmHg), driving rapid passive filling; the bright colour reflects high haemoglobin oxygen saturation in arterial blood
      Correct answer
    • Rapid filling is explained by the vacuum tube being undersized relative to the vein, not by arterial pressure
    Explanation

    In an artery, systolic pressure (80–120 mmHg) greatly exceeds the negative pressure inside a vacuum tube, causing blood to rush in passively and rapidly without requiring the needle's bevel to be optimally positioned. Arterial blood is highly oxygenated (SaO2 ~98%), giving it a bright cherry-red colour. Both findings together — very rapid filling and bright red colour — are classic signs of inadvertent arterial entry and indicate immediate needle withdrawal. Key takeaway: rapid passive tube filling (driven by arterial pressure) + bright red colour = inadvertent arterial entry — withdraw needle and apply firm sustained pressure.

  2. A phlebotomist palpates the median cubital vein and finds it is soft and bouncy, refills after compression, and runs straight across the antecubital fossa. What do these findings collectively indicate?

    • The vein is patent, well-positioned, and suitable for routine venepuncture
      Correct answer
    • The findings indicate oedema; soft tissue in oedematous arms can feel similarly bouncy on palpation
    • The vein's refilling indicates it is a thrombosed vein that has partially recanalised
    • The vein is too superficial because patent veins run close to the skin surface
    Explanation

    Soft, bouncy, refilling, and straight are the four key positive palpation findings that confirm a vein is patent and suitable for venepuncture:

    1. Soft — confirms the vein wall is not sclerotic
    2. Bouncy/resilient — confirms the lumen contains actively circulating blood
    3. Refills after compression — confirms unobstructed blood flow
    4. Straight segment — facilitates needle alignment and reduces through-puncture risk

    Per CLSI GP41-A7, all four criteria collectively confirm suitability. Arteries are pulsatile and firmer; oedematous tissue is diffusely soft without the specific rebound of a vein lumen. This is the ideal palpation finding for any venepuncture site.

  3. Which federal law directed OSHA to explicitly require safety-engineered sharps devices in healthcare settings?

    • The Occupational Safety and Health Act of 1970
    • The Clinical Laboratory Improvement Amendments (CLIA)
    • The OSHA Bloodborne Pathogens Standard (original 1991 version)
    • The Needlestick Safety and Prevention Act of 2000
      Correct answer
    Explanation

    The Needlestick Safety and Prevention Act (P.L. 106-430), signed in 2000, directed OSHA to amend the Bloodborne Pathogens Standard to explicitly require safety-engineered sharps where feasible. The original 1991 BBP Standard referenced engineering controls generally, but the 2000 Act made safety-engineered sharps and employee input in device selection explicit requirements. The amended standard took effect in 2001. Key takeaway: The Needlestick Safety and Prevention Act of 2000 mandated explicit use of safety-engineered sharps and employee input in device selection.