ADAMTS 13 Antibody
|Also Known as (Alias)||ATS-13 Antibody|
|Test Information||If ADAMTS 13 activity is less than 30%, then reflex testing for an inhibitor and antibody will be performed. The ADAMTS 13 antibody test uses microtiter wells coated with a recombinant ADAMTS 13 protease. After incubation with the patient’s plasma, a conjugated anti-human IgG is applied and the test is completed with the change of color as an indication of an antibody. Test results of 12 – 15 units/mL is borderline positive for an antibody. Results of greater than 15 units/mL is positive.|
|Additional Test Information||Strong antibody-mediated inhibition of ADAMTS13 activity (>90%) is seen in approximately half of the patients with acquired TTP. The presence of this level of inhibition strengthens the case for a diagnosis of TTP. The significance of milder ADAMTS13 inhibition is unclear, particularly when the overall ADAMTS13 level is not severely depressed. The assay used does not distinguish between antibody-mediated and non-specific ADAMTS13 inhibition.
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
|Turn around Time (analytic time)||2-3 business days|
|Report/Results||Fax number required to receive report|