Days Set Up
Thursday
Analytic Time

3 hours

Soft Order Code
INH2, INH5, INH7, INH10, INH11, INH12

Test Updated:

Synonyms

Bethesda Inhibitor
Coagulation Factor II Inhibitor Assay
Factor II Inhibitor Assay
Factor Inhibitor Assay
Inhibitor Assay II, V, VII, X, XI, or XII
Specific Factor Inhibitor Assay
Inhibitor Assay II:C
Inhibitor Assay V:C
Inhibitor Assay VII:C
Inhibitor Assay X:C
Inhibitor Assay XI:C
Inhibitor Assay XII:C
Coagulation Factor V Inhibitor Assay
Factor Inhibitor Assay
Factor V Inhibitor Assay
Inhibitor Assay II, V, VII, X, XI, or XII
Specific Factor Inhibitor Assay
Factor Inhibitor Assay
Factor VII Inhibitor Assay
Inhibitor Assay II, V, VII, X, XI, or XII
Specific Factor Inhibitor Assay
Coagulation Factor X Inhibitor Assay
Factor Inhibitor Assay
Factor X Inhibitor Assay
Inhibitor Assay II, V, VII, X, XI, or XII
Specific Factor Inhibitor Assay
Coagulation Factor XI Inhibitor Assay
Factor Inhibitor Assay
Factor XI Inhibitor Assay
Inhibitor Assay II, V, VII, X, XI, or XII
Specific Factor Inhibitor Assay
Coagulation Factor XII Inhibitor Assay
Coagulation Factor VII Inhibitor Assay
Factor Inhibitor Assay
Factor XII Inhibitor Assay
Inhibitor Assay II, V, VII, X, XI, or XII
Specific Factor Inhibitor Assay
II INHIB
II INHIB FACTOR INHIBITOR
V INHIB
VII INHIB
VIII INHIB
IX INHIB
X INHIB
XI INHIB
XII INHIB
Factor 7 Inhibitor Assay
Factor 2 Inhibitor Assay
Factor 5 Inhibitor Assay
Factor 10 Inhibitor Assay
Factor 11 Inhibitor Assay
Factor 12 Inhibitor Assay
INH10
INH11
INH12
INH2
INH5
INH7
INHIB

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Test Overview

Test Methodology

Photo-optical determination of clot inhibition.

Test Usage

Detection of inhibitors directed against specific coagulation factors.

Reference Range

Normal individuals have <0.5 Bethesda units. Critical value is >0.5 Bethesda units if no prior inhibitor has been detected.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Onsite

The specific factor assay activity level is included with this test order.The inhibitor level will not be performed if the factor activity level is greater than 50%. Collect specimen in two blue top (citrate 3.2%) tubes. Mix by inversion. Specimen should arrive at lab within 3 hours of collection; transport at room temperature. Collection of the blood through lines that have been previously flushed with heparin should be avoided. If the blood must be drawn through a VAD (vascular access device), the line should be flushed with 5 mL of saline and the first 5 mL of blood or six dead space volumes of the VAD discarded.

Collection Offsite

The specific factor assay activity level is included in this order.If the factor activity level is >50%, the inhibitor level will not be performed. Collect specimen in two blue top (citrate 3.2%) tubes. Mix by inversion. Specimen should arrive at lab within 3 hours of collection; transport at room temperature. Alternatively, centrifuge, aliquot plasma from each blue top tube into separate plastic vials, and freeze the specimen within 4 hours of collection. Transport frozen specimen on dry ice. Collection of the blood through lines that have been previously flushed with heparin should be avoided. If the blood must be drawn through a VAD (vascular access device), the line should be flushed with 5 mL of saline and the first 5 mL of blood or six dead space volumes of the VAD discarded.

Blue Top Tube
Normal Volume
2 full 2.7mL tubes or 2mL of plasma (two 1 mL aliquots)
Minimum Volume
2 full 1.8mL tubes or 2mL of plasma (two 1 mL aliquots)

Billing Information

CPT Code
85335
Pro Fee Code
 
LOINC
 

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.