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WA1 IgG Antibody, IFA [17231X]

Test Code


CPT Code(s)

**This test is not available for New York patient testing**

Preferred Specimen(s)

0.5 mL serum collected in a red-top tube (no gel)

Minimum Volume

0.2 mL

Transport Temperature

Refrigerated (cold packs)

Specimen Stability

Room temperature: 48 hours
Refrigerated: 60 days
Frozen: Indefinitely


Immunofluorescence Assay (IFA)

Performing Laboratory

Quest Diagnostics Infectious Disease, Inc.
33608 Ortega Highway, Bldg B-West Wing
San Juan Capistrano, CA 92675-2042

Setup Schedule

Set up: Tues-Sat; Report available: 2-4 days

Reference Range(s)


Clinical Significance

WA1 is a Babesia-like piroplasm recently associated with cases of babesiosis in the Pacific Northwest. Studies indicate a seroprevalence rate of approximately 20% in Pacific Northwest residents, including those living in northern California. Little, if any, cross-reactivity occurs between Babesia microti and WA1.

Alternative Name(s)

Babesia duncani IgG Antibody, IFA

LOINC®' Code(s)

The Result and LOINC information listed below should not be used for electronic interface maintenance with Quest Diagnostics. Please contact the Quest Diagnostics Connectivity Help Desk for more information at 800-697-9302.

NOTE: The codes listed in the table below are not orderable Test Codes.

Result NameLOINC CodeComponent Name
17231WA1 IgG Antibody, IFA41415-1Babesia duncani Ab
ASTMRCVDResults Received19146-0Reference lab test results

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

LOINC assignment is based on a combination of test attributes, including the method used by the performing laboratory. For tests not performed by Quest Diagnostics, codes are assigned by the performing laboratory.

* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.