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Test Code FFAG4 Filaria Antibody (IgG4)


Specimen Required


Specimen Type: Serum

Container/Tube: Red or SST

Submission Container/Tube: Plastic vial

Specimen Volume: 0.5 mL

Collection Instructions:

1. Draw blood in a plain red-top tube(s), serum gel tube(s) is acceptable.

2. Centrifuge and send 0.5 mL serum refrigerated in a plastic vial.


Method Name

Immunoassay

Reporting Name

Filaria Antibody (IgG4)

Specimen Type

Serum

Specimen Minimum Volume

0.5 mL

Specimen Stability Information

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

Reject Due To

Gross Hemolysis Mild OK; Gross Reject
Gross Lipemia Mild OK; Gross Reject
Other reason for rejection CSF

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

Wednesday

Report Available

6 to 20 days

Performing Laboratory

Quest Diagnostics

CPT Code Information

86682