Medical Technologist Test Analyzing Medical Technologist 4

Question 1

Which hematology parameter is MOST useful to distinguish iron deficiency anemia from anemia of chronic disease?

Accepted Answer

Serum ferritin

Answer

Serum ferritin is low in iron deficiency but normal or elevated in anemia of chronic disease, making it the most discriminating test.

Question 2

A urine culture grows >100,000 CFU/mL of a single organism with a positive oxidase test and fruity odor. Which organism is MOST likely?

Accepted Answer

Pseudomonas aeruginosa

Answer

Pseudomonas aeruginosa is oxidase-positive and produces pyocyanin, giving cultures a fruity (grape-like) odor.

Question 3

In the ABO blood group system, which antibody class is responsible for immediate hemolytic transfusion reactions?

Accepted Answer

IgM

Answer

IgM anti-A and anti-B are naturally occurring, complement-fixing antibodies that cause severe intravascular hemolysis in ABO incompatibility.

Question 4

A chemistry analyzer flags a lipemic specimen. Which test result is MOST likely to be artifactually lowered?

Accepted Answer

Sodium

Answer

Lipemia causes volume displacement, artifactually lowering the measured concentration of electrolytes like sodium (pseudohyponatremia).

Question 5

Which fungal organism produces germ tubes when incubated in serum at 37°C for 2–3 hours?

Accepted Answer

Candida albicans

Answer

Candida albicans produces germ tubes (Reynolds-Braude phenomenon) in serum at 37°C, which is a rapid presumptive identification test.

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