NHI Phlebotomy and Lab Procedures 3

Question 1

What is the recommended angle of needle insertion for standard venipuncture?

Accepted Answer

15–30 degrees

Answer

A 15–30 degree angle allows the needle to enter the vein smoothly without passing through the posterior wall.

Question 2

Which evacuated tube color is used for serum chemistry tests and contains a clot activator?

Accepted Answer

Gold/Red-gray SST

Answer

Gold or red-gray serum separator tubes (SSTs) contain silica particles that activate clotting and a gel that separates serum from the clot after centrifugation.

Question 3

A specimen labeled 'QNS' has been rejected by the laboratory. What does QNS mean?

Accepted Answer

Quantity Not Sufficient

Answer

QNS means 'Quantity Not Sufficient,' indicating the specimen volume is inadequate to perform the ordered tests.

Question 4

When performing capillary puncture on an infant's heel, which area should be AVOIDED?

Accepted Answer

Central posterior curvature of the heel

Answer

The central posterior curvature of the heel is too close to the calcaneus bone, risking osteomyelitis (bone infection) in infants.

Question 5

Which type of specimen collection is used for blood cultures to detect systemic infection?

Accepted Answer

Two separate venipunctures, each yielding aerobic and anaerobic bottles

Answer

Blood cultures require two separate venipuncture sites to reduce false positives from contamination, each yielding aerobic and anaerobic culture bottles.

(NHI) National Healthcareer Institute Certification Practice Test

(NHI) National Healthcareer Institute Certification Practice Test

NHI Phlebotomy and Lab Procedures 3