Medical Laboratory Science

1. Question 1 · Blood Banking

   Which of the following antigens is the most immunogenic after the D antigen in the Rh blood group system?
   • A.E
   • B.C
   • C.K
   • D.Fya
   Show answer and explanation

   Answer: C. K

   The Kell (K) antigen is highly immunogenic, second only to the D antigen in the Rh system. Its ability to stimulate antibody formation makes it clinically significant in transfusion medicine and hemolytic disease of the fetus and newborn (HDFN).

2. Question 2 · Laboratory Operations

   Which reagent strip test is most sensitive to detecting urinary protein?
   • A.SSA test
   • B.Biuret method
   • C.TCA precipitation
   • D.Protein error of indicators
   Show answer and explanation

   Answer: D. Protein error of indicators

   The dipstick test for protein is based on the “protein error of indicators,” where certain dyes change color in the presence of protein without a change in pH. Next, I’ll proceed with:

3. Question 3 · Chemistry

   Which of the following conditions most commonly leads to respiratory acidosis?
   • A.Panic attack
   • B.Vomiting
   • C.Salicylate poisoning
   • D.Opioid overdose
   Show answer and explanation

   Answer: D. Opioid overdose

   Opioids can suppress the respiratory center, leading to hypoventilation and CO₂ retention, resulting in respiratory acidosis.

4. Question 4 · Blood Banking

   Which of the following is part of the innate immune system?
   • A.T-lymphocytes
   • B.Neutrophils
   • C.B-lymphocytes
   • D.Plasma cells
   Show answer and explanation

   Answer: B. Neutrophils

   Neutrophils are a key component of the innate immune response, providing rapid, nonspecific defense against invading pathogens.

5. Question 5 · Microbiology

   (Passage-based):

   A 45-year-old man with AIDS presents with meningitis. CSF India ink stain reveals round yeast cells with a large clear halo.

   Which organism is most likely responsible?
   • A.Cryptococcus neoformans
   • B.Histoplasma capsulatum
   • C.Aspergillus fumigatus
   • D.Candida glabrata
   Show answer and explanation

   Answer: A. Cryptococcus neoformans

   Cryptococcus neoformans is an encapsulated yeast often seen in immunocompromised patients. Its polysaccharide capsule is best visualized using the India ink stain.

6. Question 6 · Blood Banking

   Which immunohematologic technique uses antihuman globulin to detect non-agglutinating antibodies?
   • A.Forward typing
   • B.Saline replacement technique
   • C.Indirect Coombs test
   • D.Reverse typing
   Show answer and explanation

   Answer: C. Indirect Coombs test

   The indirect Coombs (indirect antiglobulin) test detects antibodies in serum that can bind to red cells but do not cause agglutination. Antihuman globulin is used to bridge the gap and form visible clumping.

7. Question 7 · Laboratory Operations

   Which of the following urine parameters is most affected by exposure to light and therefore must be tested promptly?
   • A.Glucose
   • B.Urobilinogen
   • C.Blood
   • D.Ketones
   Show answer and explanation

   Answer: B. Urobilinogen

   Urobilinogen is light-sensitive and degrades quickly when exposed, leading to false-negative results. Urine should be tested as soon as possible or kept in the dark. Next, I will continue with:

8. Question 8 · Chemistry

   What is the primary buffer system that maintains pH in blood?
   • A.Protein-phosphate buffer
   • B.Bicarbonate-carbonic acid buffer
   • C.Hemoglobin buffer
   • D.Chloride shift
   Show answer and explanation

   Answer: B. Bicarbonate-carbonic acid buffer

   This buffer system maintains blood pH through the dynamic equilibrium of carbonic acid and bicarbonate, regulated by the lungs and kidneys.

9. Question 9 · Blood Banking

   Which cytokine is primarily responsible for promoting inflammation by inducing fever and activating endothelial cells?
   • A.Interferon-alpha
   • B.Interleukin-1
   • C.Interleukin-10
   • D.Tumor necrosis factor-beta
   Show answer and explanation

   Answer: B. Interleukin-1

   IL-1 is a pro-inflammatory cytokine that induces fever, promotes leukocyte migration, and activates the endothelium in inflammatory responses.

10. Question 10 · Microbiology

    Which of the following parasites is typically detected in a blood smear with a “ring form” inside red blood cells?
    • A.Plasmodium falciparum
    • B.Trypanosoma cruzi
    • C.Leishmania donovani
    • D.Toxoplasma gondii
    Show answer and explanation

    Answer: A. Plasmodium falciparum

    Plasmodium falciparum, the causative agent of severe malaria, appears as ring forms (trophozoites) inside erythrocytes on a Giemsa-stained blood smear.

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