Post Transfusion Purpura (PTP) Workup
| Also Known as (Alias) | PTP |
| Method | Flow Cytometry, Polymerase Chain Reaction (PCR), Enzyme Linked Immunosorbant Assay (ELISA) |
| Test Information | Strong positive antibody results against platelets from random donors and the absence of common platelet antigens in the patient are indicative of PTP. |
| Additional Test Information | Post-transfusion Purpura (PTP) can occur in patients who have been previously sensitized to platelets by transfusion or through pregnancy. Transfusion of cellular blood products containing any platelets (e.g., platelets, granulocytes or red blood cell transfusions) induce a recall of a previously formed alloantibody against platelet specific antigen(s) between 5-10 days post-transfusion. In the process of recalling the alloantibody, the patient apparently also develops a transient autoantibody that leads to the destruction of the patient’s own platelets often resulting in severe thrombocytopenia. |
| Sample Requirements | Please contact Platelet Immunology Laboratory at 206-689-6543 for sample and drug requirements |
| Sample Information | Samples must be received Monday thru Friday morning. Samples received after 10:00am on Friday or over the weekend will have to be re-drawn. |
| Shipping Information | Send whole blood specimens at ambient temperature. Specimens should arrive in the lab within 24 hours from draw time.
Send samples to: For additional information, please see Ordering Information |
| Requisition Form | RFT- Platelet Immunology Laboratory |
| Transaction Code | 3660-00 |
| CPT Codes | 81105, 81106, 81107, 81108, 81109, 81110, 81111, 81112, 86022 x6, 86023 x4, 86832 x1 |
| Test Schedule | As requested |
| Turn around Time (analytic time) | 1 business day for antibody screen 5 business days for additional testing |
| Report/Results | Fax number required to receive report |
