Phlebotomy Practice Test: Video 1 Answers (25 Questions)

Question 1

Which tube color is used for blood bank (type and screen, crossmatch) testing?

Accepted Answer

Pink (EDTA)

Answer

Pink top tubes contain EDTA and are specifically designated for blood bank testing to avoid confusion with other EDTA tubes, with special labeling requirements.

Question 2

What additive is found in a royal blue top tube used for trace element testing?

Accepted Answer

EDTA or no additive (K2EDTA or plain)

Answer

Royal blue tubes contain either EDTA or no additive and are made with trace-element-free stoppers to prevent contamination.

Question 3

In the order of draw, where does the EDTA (lavender) tube fall relative to heparin tubes?

Accepted Answer

After heparin tubes

Answer

EDTA tubes are drawn after heparin (green) tubes to prevent EDTA carryover from affecting coagulation or chemistry tests.

Question 4

How many times should a sodium citrate (light blue) tube be inverted after collection?

Accepted Answer

5–6 times

Answer

Light blue tubes should be inverted 3–4 times according to most manufacturers; however, CLSI and many references cite 3–4 gentle inversions to mix the anticoagulant without activating platelets.

Question 5

Which tube is collected FIRST in the venipuncture order of draw?

Accepted Answer

Blood culture bottles

Answer

Blood culture bottles are always collected first to minimize contamination risk from skin flora.