Preferred Sample Type

Bethesda / Inhibitor Assay (Human and Porcine)

Bethesda / Inhibitor Assay (Human and Porcine)

Specimen Volume

2 x 3.5 mL

Specimen Transport

Standard transport to laboratory - State for the attention of Special Coagulation on request form

Sample Preparation

Samples for any coagulation tests must be filled to the black fill line indicated on the sample tube. Any sample filled above or below this level will be rejected and a repeat sample will be required

Turnaround Time

21 days

Sample Processing In Laboratory

Sample should be centrifuged

Sample Stability

12 hours from venepuncture (ideally received no later than 4 hours after collection)

General Information

Note: For external requests please click Here for Coagulation Disorders request form. Please complete all information fully 

Samples that meet the following criteria will not be processed:

  • Haemolysed, clotted, underfilled or overfilled samples.
  • Samples >12 hours old from the time of collection.
  • Samples received from other hospital laboratories that have been frozen and thawed.
  • Samples which fail the minimum data set.

Assay Limitations:

  • If a patient has been treated with blood products e.g. factor concentrate, FEIBA, etc before performing coagulation inhibitor assays this should be taken into consideration when interpreting the data obtained.
  • It may also be useful to perform a lupus inhibitor screen when dealing with a suspected acquired coagulation factor inhibitor.

Reference Range

<0.6 BU/mL


  • EQA Status: ECAT
  • EQAS Scheme: Yes

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Location of Laboratories

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