Test Catalog

Test ID: FIL    
Filaria, Blood

Testing Algorithm Delineates situations when tests are added to the initial order. This includes reflex and additional tests.

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


See Mosquito-borne Disease Laboratory Testing in Special Instructions.

Specimen Type Describes the specimen type validated for testing

Whole Blood Na Cit

Specimen Required Defines the optimal specimen required to perform the test and the preferred volume to complete testing

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

Specimen Volume: 4.5 mL

Collection Instructions: Certain of the microfilariae have a nocturnal periodicity, and the blood specimen is best taken at night between 10 p.m. and 2 a.m.

Special Instructions Library of PDFs including pertinent information and forms related to the test


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

Specimen Minimum Volume Defines the amount of sample necessary to provide a clinically relevant result as determined by the Testing Laboratory

2 mL

Reject Due To Identifies specimen types and conditions that may cause the specimen to be rejected

All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.

Specimen Stability Information Provides a description of the temperatures required to transport a specimen to the performing laboratory, alternate acceptable temperatures are also included

Specimen TypeTemperatureTime
Whole Blood Na CitAmbient (preferred)72 hours
 Refrigerated 72 hours