Medical Laboratory TechnicianĀ Exam FREE Medical Laboratory Technician MCQ Questions and Answers 2 ā Questions and Answers
Question 1: Which anticoagulant is found in a lavender-top blood collection tube?
- EDTA (Correct answer)
- Sodium citrate
- Heparin
- Potassium oxalate
Correct answer: EDTA
Lavender-top tubes contain EDTA, which is the preferred anticoagulant for complete blood count testing.
Question 2: What is the primary stain used to differentiate gram-positive from gram-negative bacteria?
- Gram stain (Correct answer)
- Acid-fast stain
- Wright stain
- Giemsa stain
Correct answer: Gram stain
The Gram stain uses crystal violet and safranin to classify bacteria based on cell wall composition.
Question 3: A patient's blood glucose level is 250 mg/dL with ketonuria present. Which condition is most likely?
- Diabetic ketoacidosis (Correct answer)
- Hypoglycemia
- Cushing syndrome
- Addison disease
Correct answer: Diabetic ketoacidosis
Elevated blood glucose combined with ketonuria is characteristic of diabetic ketoacidosis.
Question 4: Which electrolyte imbalance is most commonly associated with hemolyzed blood specimens?
- Falsely elevated potassium (Correct answer)
- Falsely decreased sodium
- Falsely elevated calcium
- Falsely decreased chloride
Correct answer: Falsely elevated potassium
Hemolysis releases intracellular potassium into the serum, causing a falsely elevated potassium result.
Question 5: What does an elevated erythrocyte sedimentation rate (ESR) primarily indicate?
- Inflammation (Correct answer)
- Polycythemia
- Dehydration
- Iron deficiency
Correct answer: Inflammation
An elevated ESR is a nonspecific marker of inflammation caused by increased fibrinogen and immunoglobulins.
Question 6: In urinalysis, the presence of waxy casts most commonly indicates what condition?
- Chronic renal failure (Correct answer)
- Acute pyelonephritis
- Urinary tract infection
- Nephrotic syndrome
Correct answer: Chronic renal failure
Waxy casts form in dilated tubules with prolonged urine stasis, indicating chronic renal failure.
Medical Laboratory TechnicianĀ Exam FREE Medical Laboratory Technician MCQ Questions and Answers 2
Which anticoagulant is found in a lavender-top blood collection tube?