ASCP Capillary Puncture and Dermal Collection 2

Question 1

Which lancet is most appropriate for a premature infant requiring a heel stick?

Accepted Answer

A retractable lancet designed for premature neonates with a depth of 0.85 mm or less

Answer

Premature neonates have thinner skin and less tissue depth, requiring shallower lancets (0.85 mm or less) to avoid bone injury.

Question 2

Which analyte shows the greatest variation between capillary and venous blood samples?

Accepted Answer

Glucose

Answer

Glucose concentrations can differ significantly between capillary and venous blood due to peripheral tissue metabolism, especially in fasting or diabetic patients.

Question 3

When performing a heel stick on a neonate, where should the puncture NOT be made?

Accepted Answer

Posterior curvature of the heel

Answer

The posterior curvature of the heel is avoided because it is closest to the calcaneus bone, increasing the risk of osteomyelitis and nerve damage.

Question 4

Why must alcohol be completely dried before performing a capillary puncture?

Accepted Answer

Residual alcohol can hemolyze the specimen and cause a burning sensation

Answer

Residual alcohol hemolizes red blood cells in the specimen and causes patient discomfort at the open puncture site.

Question 5

What must be done to a capillary tube used for microhematocrit before centrifugation?

Accepted Answer

Seal one end with clay or a plastic cap

Answer

All capillary tubes used for microhematocrit must be sealed at one end with clay or a plastic cap to prevent leakage during high-speed centrifugation.

ASCP Phlebotomy Technician Exam Practice Test

ASCP Phlebotomy Technician Exam Practice Test

ASCP Capillary Puncture and Dermal Collection 2