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Test Code FFAG4 Filaria Antibody (IgG4)

Additional Codes

Epic Ordering Code LAB3040770
NBS code LBC02292
Service code 33107


Specimen Required


Collection Container/Tube:

Preferred: Red top

Acceptable: Serum gel

Submission Container/Tube: Plastic vial

Specimen Volume: 0.5 mL Serum

Collection Instructions:

1. Centrifuge and aliquot 0.5 mL serum into a plastic vial.

2. Send refrigerate.


National University Hospital-Singapore Note:

NUH Outreach Laboratories:
Specimen Requirements
Submit only one of the following:
Preferred: Red Top
Acceptable: Yellow Top
Processing Requirements
Centrifuge and aliquot serum into a Mayo plastic tube.
Specimen type: Serum
Volume: 0.5 mL
Storage/transport requirements: Refrigerated

Secondary ID

57875

Method Name

Immunoassay

Reporting Name

Filaria Antibody (IgG4)

Specimen Type

Serum

Specimen Minimum Volume

See Specimen Required

Specimen Stability Information

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

Reject Due To

Gross hemolysis Reject
Gross lipemia Reject
Gross icterus Reject
CSF Reject

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

3 to 18 days
National University Hospital-Singapore Note:

Please note that this is a referral test requiring transport to the external testing facility and an additional 3-5 days is required.

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

86682

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
National University Hospital-Singapore Additional Information:

Last updated 17/07/2026