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Test Code MISC2MAYOA1R A1 Antigen Subtype, Blood

Important Note

Miscellaneous Test

Shipping Instructions

Specimen must arrive within 7 days of collection

Specimen Required

Container/Tube: Pink top (EDTA)

Specimen Volume: 6 mL

Pediatric Volume: 2 mL blood in 6 mL pink-top (EDTA) tube

Collection Instructions: Send whole blood specimen in original tube. Do not aliquot.

Secondary ID


Useful For

Additional proof of alloantibody specificity


Assessment of solid organ transplantation donor compatibility


This test is not useful for the purpose of establishing paternity.

Method Name


Reporting Name

A1 antigen subtype

Specimen Type

Whole Blood EDTA

Specimen Minimum Volume

See Specimen Required

Specimen Stability Information

Specimen Type Temperature Time Special Container
Whole Blood EDTA Refrigerated (preferred) 7 days
  Ambient  72 hours

Reject Due To

Gross hemolysis OK

Clinical Information

The presence or absence of a cellular antigen is an inherited trait. As a general rule, individuals will not make antibody directed against an antigen present on their own red blood cells.

Reference Values

Reported as Negative or Positive

Method Description

Agglutination of red blood cells with an antiserum represents the presence of the corresponding antigen in the red blood cells.( MK, Eder AF, Spitalnik SL, Westhoff CM: Technical Manual. 19th ed. AABB; 2017)

Day(s) Performed

Monday through Friday, Sunday

Report Available

1 to 5 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
A1R A1 antigen subtype 844-1


Result ID Test Result Name Result LOINC Value
A1R A1 antigen subtype 844-1