Retinitis laboratory findings

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Laboratory Findings

Infectious Agents

Cytomegalovirus

• Polymerase chain reaction (PCR) testing in particular regions
• Usually detectable in blood and other bodily fluids

Tuberculosis

• Positive purified derivative skin testing
• Interferon-gamma release assay (QuantiFERON Gold TB Test)
• Isolation of acid-fast bacilli

Fungal

• Testing methods for identification of a fungal infectious agent largely depend on microscopic examination of infected area.
• Localized infections may display hyphae and typically, easily identifiable lesions.

Toxoplasmosis

• Serologic testing (ELISA)

Syphilis

• Serologic testing
• Rapid plasma reagin (RPR) testing
• Fluorescent treponemal antibody absorption testing (FTA-ABS)