NCCT Capillary and Special Collections 2

Question 1

Which finger is generally preferred for capillary puncture in adults?

Accepted Answer

Middle or ring finger

Answer

The middle and ring fingers are preferred because they have adequate blood flow and fewer nerve endings compared to the index finger or thumb.

Question 2

What is the maximum recommended depth for a lancet puncture on an infant's heel?

Accepted Answer

2.0 mm

Answer

The maximum safe depth for infant heel puncture is 2.0 mm to avoid reaching the calcaneus bone and causing osteomyelitis.

Question 3

Which of the following specimens is collected using a cold agglutinin test procedure?

Accepted Answer

Specimen kept at 37 degrees C during transport

Answer

Cold agglutinin specimens must be kept warm at 37 degrees C during collection and transport to prevent cold-reacting antibodies from attaching to red blood cells at lower temperatures.

Question 4

When performing a capillary blood gas collection, which of the following is required?

Accepted Answer

Warming the site prior to collection

Answer

Warming the capillary puncture site increases arterial blood flow to the area, making the capillary blood more closely reflect arterial values.

Question 5

What is the correct procedure when the first drop of blood appears after a capillary puncture?

Accepted Answer

Wipe it away with sterile gauze

Answer

The first drop of blood is wiped away because it contains tissue fluid that can dilute the sample and affect test results.

NCCT - National Certified Phlebotomy Technician Exam Practice Test

NCCT - National Certified Phlebotomy Technician Exam Practice Test

NCCT Capillary and Special Collections 2