Test & Collection Guide

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Bethesda Assay

Ordering information:

By consultation with haematolgist.

Contact laboratory before collection.

Alternate names:
Factor Inhibitor Assay
Referred Test
Specimen types:
Container types:
Sodium CitrateSodium Citrate
Collection Instructions:

Filled to label marker and mixed by inversion.

This quantifies antibodies to coagulation factors.

Result Turnaround Time:
4 weeks
Reference Interval:

0.0-0.5 Bethesda unit/mL

Laboratory Use Only
Storage Instructions:

Specimens kept at room temperature, should be centrifuged ASAP and tested within 4 hours from time of specimen collection. If testing is not completed within 4 hours, plasma should be removed from cells and aliquoted (1mL) into Eppendorf tubes, 2 X 1 mL vials per factor inhibitor assay.

Plasma may be frozen @ -20 C for up to 2 weeks or -70 C for up to 6 months. Frost free freezers should not be used.

External Laboratory:
Alfred Hospital
 External Laboratory details...