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Lab Manual for UCSF Clinical Laboratories

Lab Manual for SFGH

Internal Resources


Item Value
Available Stat? No
Test code BLPF
Performed by? Microbiology (Parasitology)
Sendout? no
Price range $$$
In House Availability 7 days
Principle In patients infected with filarial parasites, adult worms live in the lymphatic system, subcutaneous tissues and deep connective tissues. The adult female produces microfiliariae which can be detected in peripheral blood. Thin and thick blood smears are prepared and stained with Wright's and Giemsa stains. A concentration procedure is also performed since the number of circulating microfilariae may be very low. The concentrated sediment is examined microscopically.
Interpretation Detection of microfilariae in blood confirms a diagnosis of filarial infection.
Container type EDTA (lavender top) tube
Sample type Whole blood, 4 mL in EDTA (lavender top tube). Microfilariae may exhibit periodicity in the circulation. In order to detect the microfilariae, blood may need to be collected at different times of the day or night. Contact the Laboratory Medicine Resident in Microbiology (206-8576 or pager 415-443-1438) for consultation.
Synonyms Blood Parasites;
Stability Keep blood at room temperature; deliver immediately to Lab. Blood smears should be prepared within one hour after specimen was drawn.
References Garcia, LS, Diagnostic Medical Parasitology, 5th Ed., ASM Press, Washington, DC, 2007.
CPT coding 87207
Last Updated 4/30/2011 10:36:52 AM
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