MedLab Insight

Stool microscopy examination 😲😍🔬
Identify the stool Parasite 🪱 🦠

The oil immersion objective is most commonly used for observing:
A. Large parasites
B. Fungal colonies on agar plates
C. Bacteria and blood cells
D. Tissue blocks
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Why is the underside of a culture plate often examined during plate reading?
A. To determine colony pigmentation and hemolysis more clearly
B. To check the expiration date of the medium
C. To sterilize the plate
D. To identify the organism microscopically
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Urine microscopy examination 😍🦠

Which culture medium is commonly used for primary isolation of many pathogenic bacteria?
A. TCBS agar
B. Lowenstein–Jensen medium
C. Blood agar
D. Sabouraud dextrose agar
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A discrepancy between forward and reverse ABO grouping may be caused by:
A. Rouleaux formation
B. Weak subgroups of A or B
C. Unexpected antibodies
D. All of the above
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In the four-quadrant streak method, the number of organisms decreases progressively because:
A. Incubation temperature changes
B. The medium inhibits growth
C. Nutrients are depleted in successive quadrants
D. Each quadrant is streaked from the previous one with dilution of inoculum
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Blood film under the lens😍🔬

During pour plate preparation, the inoculum and molten agar should be mixed by:
A. Vigorous shaking to produce bubbles
B. Gentle rotation of the plate in a figure-eight motion
C. Centrifugation
D. Continuous stirring with a glass rod
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