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Image Attributions

Images used in LabGOTO assessment questions are sourced from public-domain and Creative-Commons licensed repositories. Credits are listed below.

Wikimedia Commons

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Gram-positive cocci arranged in clusters are most consistent with which organism?

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Which rapid test detects acid-fast bacilli and is commonly used for TB?

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The peripheral smear demonstrates red cells with a bull's-eye appearance: a central button of hemoglobin, a pale ring, a...

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The smear demonstrates erythrocytes with a slit- or mouth-shaped area of central pallor. Which morphology is shown?

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The smear demonstrates crescent-shaped, elongated red cells with pointed ends. These cells are most associated with whic...

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The smear demonstrates fragmented, helmet-shaped red cells. This finding is most consistent with which process?

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The Gram stain demonstrates Gram-positive cocci arranged in clusters. Which organism is most likely?

Wikimedia Commons · CC BY-SA 4.0 · Courtesy of CDC Public Health Image Library (public domain) · Source

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The Gram stain demonstrates lancet-shaped Gram-positive diplococci. Which organism is most likely?

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A stool specimen demonstrates a pear-shaped flagellate with two nuclei giving a falling-leaf appearance on wet mount. Wh...

Wikimedia Commons · CC BY-SA 4.0 · Courtesy of CDC DPDx (public domain) · Source

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A cornmeal agar preparation demonstrates yeast cells with pseudohyphae and blastoconidia. Which organism is most likely?

Wikimedia Commons · CC BY-SA 4.0 · Courtesy of CDC Public Health Image Library (public domain) · Source

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The smear shows small, round, dense red cells lacking central pallor. Which morphology is shown?

Wikimedia Commons · CC BY-SA 4.0 · Complete on fetch: author via Wikimedia Commons, CC BY-SA 4.0 · Source

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A urethral smear shows Gram-negative diplococci within neutrophils. The most likely organism is:

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A Ziehl-Neelsen stain shows red, slender acid-fast bacilli. The organism is most likely:

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Urine microscopy shows casts containing white cells. These casts indicate:

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A blast on the smear contains a rod-shaped, azurophilic inclusion. This finding supports:

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The smear shows a bilobed cell with large orange-red granules. This cell is increased in:

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Urine microscopy shows colorless prisms with a coffin-lid appearance. These crystals are:

Wikimedia Commons · CC BY-SA 3.0 · Complete on fetch: author via Wikimedia Commons, CC BY-SA 4.0 · Source