Phlebotomy Test Capillary and Dermal Puncture 2

Question 1

Which lancet depth is recommended for an adult fingerstick to ensure adequate blood collection without causing undue pain?

Accepted Answer

1.5–2.0 mm

Answer

A lancet depth of 1.5–2.0 mm is typically sufficient for adult fingerstick collection, providing adequate blood flow while minimizing pain and avoiding deep tissue.

Question 2

A capillary blood glucose result is typically considered to be which of the following compared to a venous plasma glucose?

Accepted Answer

Approximately equal to or slightly higher than venous plasma glucose

Answer

Capillary blood glucose is approximately equal to or slightly higher (up to 10–15% higher) than venous blood glucose because capillary blood contains more arterial blood with higher glucose.

Question 3

Which of the following is an absolute contraindication for a fingerstick on a specific finger?

Accepted Answer

Fingers with edema or poor circulation

Answer

Fingers with edema have excess interstitial fluid that will dilute the blood sample, and poor circulation means inadequate blood flow for collection—both are contraindications.

Question 4

For a neonatal PKU screening (newborn screening), the blood specimen is collected on which type of collection device?

Accepted Answer

Blood spot filter paper card (Guthrie card)

Answer

Newborn metabolic screening uses filter paper blood spot cards (Guthrie cards), where blood drops are applied to designated circles and dried for analysis.

Question 5

After a fingerstick, the patient should be instructed to hold their finger:

Accepted Answer

Elevated above heart level with pressure applied

Answer

Elevating the puncture site above heart level reduces blood flow and promotes hemostasis while applying gentle pressure; dependent positioning increases bleeding.

Phlebotomy Practice Test Practice Test

Phlebotomy Practice Test Practice Test

Phlebotomy Test Capillary and Dermal Puncture 2