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Test ID FIL Filaria, Blood

Useful For

Detecting microfilariae in peripheral blood

Method Name

Microscopic Examination

Reporting Name

Filaria, B

Specimen Type

Whole Blood Na Cit

Specimen Required

Container/Tube: Light-blue top (3.2% sodium citrate)

Specimen Volume: 2.7 mL

Collection Instructions: Certain microfilariae have a nocturnal or diurnal periodicity, therefore the blood collection should be timed to correspond with the release of microfilariae in the peripheral circulation. For the agents of lymphatic filariasis (Wuchereria bancrofti and the Brugia species), blood should be collected between 10 p.m. and 2 a.m., whereas for detection of Loa loa, blood should be collected between 10 a.m. and 2 p.m.

Specimen Minimum Volume

2 mL

Specimen Stability Information

Specimen Type Temperature Time
Whole Blood Na Cit Ambient (preferred) 72 hours
  Refrigerated  72 hours

Reference Values


If positive, organism is identified.

Day(s) Performed

Monday through Friday

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information



LOINC Code Information

Test ID Test Order Name Order LOINC Value
FIL Filaria, B 10662-5


Result ID Test Result Name Result LOINC Value
FIL Filaria, B 10662-5

Test Classification

This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

Report Available

1 to 4 days

NY State Approved



If not ordering electronically, complete, print, and send a Microbiology Test Request (T244) with the specimen.

Reflex Tests

Test ID Reporting Name Available Separately Always Performed
FILB Filaria Bill Only No, (Bill Only) No

Testing Algorithm

In the event that microfilaria is discovered in the Knott Concentration; a Giemsa stain for identification will be performed at an additional charge.


For more information see Mosquito-borne Disease Laboratory Testing.