NHI Phlebotomy and Lab Procedures 2

Question 1

Which additive in a lavender-top tube prevents clotting by binding calcium?

Accepted Answer

EDTA

Answer

Sodium citrate

Answer

Heparin

Answer

Sodium fluoride

Question 2

A patient's arm shows a hematoma forming during venipuncture. What is the FIRST action?

Accepted Answer

Release the tourniquet and remove the needle

Answer

Apply a warm compress

Answer

Redirect the needle to a different angle

Answer

Increase suction on the evacuated tube

Question 3

Which vein is considered the FIRST choice for routine venipuncture in adults?

Accepted Answer

Median cubital vein

Answer

Basilic vein

Answer

Cephalic vein

Answer

Dorsal hand vein

Question 4

What is the purpose of the 'order of draw' in phlebotomy?

Accepted Answer

To prevent cross-contamination of additives between tubes

Answer

To speed up specimen processing time

Answer

To ensure proper labeling sequence

Answer

To reduce patient discomfort during collection

Question 5

A gray-top tube contains sodium fluoride. What is its PRIMARY purpose?

Accepted Answer

Inhibit glycolysis to preserve glucose levels

Answer

Preserve coagulation factors

Answer

Promote clot formation

Answer

Prevent hemolysis of red cells

Question 6

Which condition results from excessive tourniquet pressure or prolonged application?

Accepted Answer

Hemoconcentration

Answer

Hemodilution

Answer

Hemolysis

Answer

Lipemia

Question 7

In the context of chain of custody, which specimen type typically requires this strict documentation?

Accepted Answer

Drug-of-abuse urine specimen

Answer

Routine CBC

Answer

Basic metabolic panel

Answer

Thyroid function test