Extended Patient Phenotype (7 or more antigens)
| Also Known as (Alias) | Red Cell antigen typing other than Rh antigens |
| Indications | Determination the presence (or absence) of specific red cell antigens which includes, but not limited to: K, Fya, Fyb, Jka , Jkb, S, s. Any patient that produces an unexpected antibody to one or more red cell antigens will need an extended phenotype of all the common antigens to confirm or exclude antibody specificity. Patients who may require long-term transfusion therapy (eg. sickle cell anemia or hemolytic anemia patients) will need extended RBC phenotype to identify the safest RBC product for transfusion. When an antibody identification workup is ordered, the extended phenotype is part of the identification process. If Rh phenotype is desired, order Rh phenotype. |
| Method | Standard test tube methodology, Hemagglutination |
| Test Information | Test dependent on the antigen present |
| Additional Test Information | If the patient has been transfused in the last three months, antigen typing of patient red cells may yield unreliable results due to the presence of donor cells. A pre-transfusion should be used for antigen typing, if available. RBC genotyping can provide this information in recently transfused recipients. |
| Sample Requirements | EDTA tube. Serum separator gel tube is not acceptable. |
| Requested Volume | 1 full 7 ml EDTA sample |
| Minimum Volume or Pediatric volume | Minimum volume: 1 full 7 ml EDTA sample Pediatric: 1 full 3 ml EDTA sample; neonate: 2 full 0.5 ml EDTA microtainers |
| Shipping Information | Ship at ambient temperature
Send samples to: |
| Requisition Form | RFT-Request for Testing Transfusion Services |
| Transaction Code | 3136-00 |
| CPT Codes | 86905 |
| Test Schedule | Monday through Sunday |
| Turn around Time (analytic time) | 24 hours if weekday; 48 hours if weekend |
| Report/ Results | Fax number required to receive report |