Test Details
Methodology
Hemagglutination
Result Turnaround Time
2 - 4 days
Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.
Use
Group A subgroup typing of a potential organ donor for A1 may be important, as it may preclude a solid organ transplant to a group O or group B recipient. ABO antigens are expressed on the vascular endothelium of organs. Major incompatibility between donor ABO antigens and recipient plasma can result in acute humoral rejection of the transplanted organ. The occurrence of the A1 antigen is 34% in Caucasians, 19% in Blacks, and 27% in Asians. A1 is present in 80% of group A individuals.
Special Instructions
Limitations
Presence of potent cold agglutinins, a positive direct antiglobulin test, and (in some cases) bacteremia may interfere with test interpretation.
Specimen Requirements
Specimen
Whole blood
Volume
1 mL
Minimum Volume
0.5 mL (Note: This volume does not allow for repeat testing.)
Container
Lavender-top (EDTA) tube
Stability Requirements
Temperature | Period |
|---|---|
Room temperature | 72 hours |
Refrigerated | 72 hours |
Storage Instructions
Specimens should be tested as soon as possible or within 72 hours of collection. Samples that cannot be tested immediately should be stored at 2°C to 8°C. Do not freeze red cells.
Causes for Rejection
Gross hemolysis; bacterial or other contamination
References
LOINC® Map
| Order Code | Order Code Name | Order Loinc | Result Code | Result Code Name | UofM | Result LOINC |
|---|---|---|---|---|---|---|
| 006002 | A1 RBC Antigen Typing | 844-1 | 006001 | A1 RBC Antigen Typing | 844-1 | |
| Order Code | 006002 | |||||
| Order Code Name | A1 RBC Antigen Typing | |||||
| Order Loinc | 844-1 | |||||
| Result Code | 006001 | |||||
| Result Code Name | A1 RBC Antigen Typing | |||||
| UofM | ||||||
| Result LOINC | 844-1 |