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Test ID FFAG4 Filaria Antibody (IgG4)

Specimen Required

Specimen Type: Serum

Container/Tube: Red or SST

Specimen Volume: 0.5 mL

Collection Instructions: Draw blood in a plain red-top tube(s), serum gel tube(s) is acceptable. Spin down and send 0.5 mL serum refrigerated in a plastic vial.

Method Name


Reporting Name

Filaria Antibody (IgG4)

Specimen Type


Specimen Minimum Volume

0.5 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Refrigerated (preferred) 14 days
  Frozen  30 days
  Ambient  7 days

Reference Values

Reference Range: <2.50 index


 Interpretive Criteria:


 <2.50         Negative

≥2.50         Positive


 This assay detects Filaria IgG4 associated with infections caused by the major filarial parasites, including Dirofilaria immitis, Wuchereria brancrofti, Brugia malayi, and Onchocerca volvulus.

Chronic filarial infections manifesting as elephantiasis may not show a significant IgG4 response and cannot be ruled out using this test. Samples containing antibodies to other nematodes,

particularly Strongyloides, may cross-react in the assay.

Day(s) Performed


Report Available

6 to 20 days

Performing Laboratory

Quest Diagnostics

Test Classification

This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by the U.S. Food and Drug Administration. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
FFAG4 Filaria Antibody (IgG4) 14208-3


Result ID Test Result Name Result LOINC Value
FFAG4 Filaria Antibody (IgG4) 14208-3

NY State Approved