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Test Code ADMB ADAMTS13 Inhibitor Bethesda Titer, Plasma


Specimen Required


Only orderable as a reflex. For more information see ADAMP / ADAMTS13 Activity with Reflex Inhibitor Profile, Plasma.

 

Specimen Type: Platelet-poor plasma

Patient Preparation: Fasting preferred

Collection Container/Tube: Light-blue top (3.2% sodium citrate)

Submission Container/Tube: Plastic vials

Specimen Volume: 2 mL in 2 plastic vials, each containing 1 mL

Collection Instructions:

1. Specimen must be collected prior to factor replacement therapy.

2. For complete instructions, see Coagulation Guidelines for Specimen Handling and Processing.

3. Centrifuge, transfer all plasma into a plastic vial, and centrifuge plasma again.

4. Aliquot plasma (1 mL per aliquot) into 2 separate plastic vials leaving 0.25 mL in the bottom of centrifuged vial.

5. Freeze plasma immediately (no longer than 4 hours after collection) at -20° C or ideally, at or below -40° C.

Additional Information:

1. Double-centrifuged specimen is critical for accurate results as platelet contamination may cause spurious results.

2. Each coagulation assay requested should have its own vial.

Specimen Stability Information: Frozen 2 years


Secondary ID

620817

Useful For

Assisting with the diagnosis of congenital, immune or acquired thrombotic thrombocytopenic purpura as a part of a profile

Method Name

Only orderable as a reflex. For more information see ADAMP / ADAMTS13 Activity with Reflex Inhibitor Profile, Plasma.

 

Fluorescence Resonance Energy Transfer (FRET)

Specimen Type

Plasma Na Cit

Specimen Minimum Volume

2 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Plasma Na Cit Frozen

Reject Due To

  All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.

Reference Values

Only orderable as a reflex. For more information see ADAMP / ADAMTS13 Activity with Reflex Inhibitor Profile, Plasma.

 

<0.5 BU

Interpretation

Assisting with the diagnosis of congenital, immune or acquired thrombotic thrombocytopenic purpura as a part of a profile

Method Description

The ADAMTS13 activity is measured by a fluorescence resonance energy transfer-based assay using a synthetic fragment of von Willebrand factor as substrate. Cleavage of this small fragment by the ADAMTS13 protease generates fluorescence that is directly proportionate to the quantification of ADAMTS13 activity. The Bethesda titer assay is performed using mixing studies. One inhibitor (Bethesda) unit is defined as the concentration of an inhibitor that is able to reduce ADAMTS13 activity of normal pooled plasma by 50%.(Package insert: ATS-13 ADAMTS13 Activity Assay 2.0. Immucor; 08/2023)

Day(s) Performed

Monday through Friday, Sunday

Report Available

1 to 3 days

Specimen Retention Time

14 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information

85335

LOINC Code Information

Test ID Test Order Name Order LOINC Value
ADMB ADAMTS13 Inhibitor Titer, P 40824-5

 

Result ID Test Result Name Result LOINC Value
620817 ADAMTS13 Inhibitor Titer 40824-5