ADAMTS 13 Activity
| Also Known as (Alias) | ATS-13 |
| Indications | TTP/HUS |
| Method | Flourescence Resonance Transfer Assay (FRET) |
| Test Information | ADAMTS13 activity is measured by a Fluorescence Resonance Transfer (FRET) Assay in which fluorescence is detected when a synthetic von Willebrand Factor peptide (VWF73) is cleaved by ADAMTS13. |
| Additional Test Information | ADAMTS13 is a plasma protein that cleaves ultra-large VWF multimers, thus regulating the interaction of platelets with von Willebrand. Low ADAMTS13 activity is found in patients with thrombotic thrombocytopenia purpura (TTP). Very low levels of activity can be seen in congenital TTP, whereas modestly decreased levels have been reported in a number of clinical settings. ADAMTS13 activity levels may help differentiate TTP from other microthrombolytic disorders such as HUS or atypical HUS. Caution should be exercised in the interpretation of any assay for ADAMTS13; the results should only be considered in the conjunction with the patient’s clinical condition. Previous transfusion, plasma infusion, plasma exchange, or free hemoglobin in the plasma (>2g/L) may affect the level of ADAMTS13 as well as any inhibitors that are present. |
| Sample Requirements | Citrate (blue top) |
| Requested Volume | 5cc Citrate (blue top) |
| Shipping Information | Ship to Bloodworks immediately after draw to ensure the laboratory receives specimen within 4 hours of draw time. If this is not possible, spin within 4 hours and freeze plasma at -20C, then ship frozen specimen on dry ice.
NOTE: If the sample is received as whole blood after 4 hours of draw time, the sample will need to be redrawn Send samples to: For additional information, please see Ordering Information |
| Requisition Form | RFT- Platelet Immunology Laboratory RFT- Hemostasis Reference Laboratory |
| Transaction Code | 3260-01 |
| CPT Codes | 85397 |
| Test Schedule | Monday, Wednesday, and Friday |
| Turn around Time (analytic time) | 2-3 business days |
| Report/Results | Fax number required to receive report |
