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WA1 IgG Antibody, IFA [17231X]

Test Code


CPT Code(s)


Preferred Specimen(s)

0.5 mL Serum
Instructions: Test is not available for New York State
patient testing. There is no recommended alternative for
New York State clients.

Minimum Volume

0.2 mL

Specimen Container

Red-top tube (no gel)

Transport Temperature


Specimen Stability

Room Temperature: 2 days
Refrigerated: 2 months
Frozen: indefinite


Immunofluorescence Assay (IFA)

Performing Laboratory

Focus Diagnostics, Inc.
5785 Corporate Ave, Suite 200
Cypress, CA 90630

Setup Days

Tuesday-Saturday Morning
Report available: Next Day

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.

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.