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Recommendations when to order or not order the test. May include related or preferred tests.
Determine if the Fy(a) (FY1) and Fy(b) (FY2) antigens are expressed on the patient's red blood cells. To determine if the patient is heterozygous or homozygous for the Fy(a) and Fy(b) antigens. In an otherwise healthy individual, this test is sufficient for evaluation of Duffy-null associated neutropenia. This test does not assess for mutation to the binding site of the erythroid-specific GATA1 transcription factor; if this is indicated, refer to Red Blood Cell Antigen Genotyping (3001053).
New York DOH Approval Status
Indicates whether a test has been approved by the New York State Department of Health.
This test is New York state approved.
Specimen Required
Patient PreparationInstructions patient must follow before/during specimen collection.
CollectSpecimen type to collect. May include collection media, tubes, kits, etc.
Lavender (K2EDTA) or pink (K2EDTA).
Specimen PreparationInstructions for specimen prep before/after collection and prior to transport.
Do not freeze. Transport 7 mL whole blood. (Min: 0.5 mL)
Storage/Transport TemperaturePreferred temperatures for storage prior to and during shipping to ARUP. See Stability for additional info.
Refrigerated.
Unacceptable ConditionsCommon conditions under which a specimen will be rejected.
Separator tubes.
RemarksAdditional specimen collection, transport, or test submission information.
StabilityAcceptable times/temperatures for specimens. Times include storage and transport time to ARUP.
The American Medical Association Current Procedural Terminology (CPT) codes published in ARUP's Laboratory Test Directory are provided for informational purposes only. The codes reflect our interpretation of CPT coding requirements based upon AMA guidelines published annually. CPT codes are provided only as guidance to assist clients with billing. ARUP strongly recommends that clients confirm CPT codes with their Medicare administrative contractor, as requirements may differ. CPT coding is the sole responsibility of the billing party. ARUP Laboratories assumes no responsibility for billing errors due to reliance on the CPT codes published.
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Aliases
Other names that describe the test. Synonyms.
Duffy A Antigen Typing; Duffy B Antigen; FYI antigen; FY2 antigen; 2007717; 2007725; Duffy Null
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