Nokea
Which of these will always be drawn first if multiple tests are ordered?
- A. Blood cultures
- B. Light blue top
- C. Red top
- D. Lavender top
Correct Answer: A
Rationale: Blood cultures are drawn first to minimize contamination risk, as they require sterile technique.
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When performing a dermal puncture for blood sugar on an adult patient, where should the puncture be made?
- A. On the lateral aspect of the heel
- B. On the lateral aspect of the finger tip
- C. On the end of the fingertip
- D. On the left earlobe
Correct Answer: B
Rationale: The lateral aspect of the fingertip is the preferred site for dermal puncture in adults to minimize pain and ensure adequate blood flow.
A patient has several blood tests ordered. You have gathered the correct tubes, which include a red top, green top, and light blue top. In which order will you draw them?
- A. Green, red, light blue
- B. Light blue, green, red
- C. Red, light blue, green
- D. Light blue, red, green
Correct Answer: D
Rationale: The order of draw is light blue (citrate), red (serum), green (heparin) to prevent cross-contamination.
Which of the following needle sizes would be an appropriate choice to use for phlebotomy in a 45-year-old patient?
- A. 16 gauge
- B. 19 gauge
- C. 21 gauge
- D. 23 gauge
- E. 30 gauge
Correct Answer: C,D
Rationale: 21- and 23-gauge needles are suitable for phlebotomy in adults, balancing blood flow and patient comfort.
A 'good' vein for phlebotomy should meet which of the following criteria?
- A. It should feel bouncy
- B. It should feel rigid
- C. It should feel knobby
- D. It should feel elastic
Correct Answer: A,D
Rationale: A good vein feels bouncy and elastic, indicating it is pliable and suitable for venipuncture.
When selecting a vein for phlebotomy, which of the following are true?
- A. Use the vein that looks the largest, no matter what its condition
- B. Avoid areas where the vein is crooked or feels hard and ropelike
- C. The site of choice is the dorsal side of the hand
- D. Use the right arm of a patient who has had a left mastectomy
- E. Use the right arm of a patient who has an IV in the right arm
Correct Answer: B,D
Rationale: Avoiding hard, crooked veins and using the non-mastectomy arm ensures safe and effective venipuncture.