Medical Technologist Test Medical Technologist Knowledge 2

Question 1

Which anticoagulant is used in the light blue (sodium citrate) tube and what is the correct blood-to-anticoagulant ratio?

Accepted Answer

Sodium citrate at 9:1

Answer

Light blue tubes contain sodium citrate at a 9:1 blood-to-anticoagulant ratio, critical for accurate coagulation testing.

Question 2

A patient's peripheral blood smear shows hypersegmented neutrophils (>5 lobes). Which deficiency is most likely?

Accepted Answer

Vitamin B12 or folate deficiency

Answer

Hypersegmented neutrophils are a classic hallmark of megaloblastic anemia caused by vitamin B12 or folate deficiency.

Question 3

In urinalysis, a positive nitrite result on a dipstick indicates:

Accepted Answer

Gram-negative bacterial infection

Answer

Nitrite is produced when gram-negative bacteria reduce dietary nitrate to nitrite in the bladder.

Question 4

The QC rule that flags a run when two consecutive control values exceed the same 2s limit on the same side of the mean is:

Accepted Answer

2-2s Westgard rule

Answer

The 2-2s rule is a warning rule indicating systematic error when two consecutive controls fall beyond ±2s on the same side.

Question 5

Which hepatitis B serologic marker is FIRST to appear after acute infection and is used to detect the window period?

Accepted Answer

Anti-HBc IgM

Answer

Anti-HBc IgM appears early and persists through the window period when HBsAg has cleared but Anti-HBs is not yet detectable.

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