Test Catalog

Test ID: 11INE    
Factor XI Inhibitor Evaluation, Plasma

Useful For Suggests clinical disorders or settings where the test may be helpful

Detection and quantitation of inhibitor to coagulation factor XI


This test is not useful for the detection of a lupus-like circulating anticoagulant inhibitor, a nonspecific circulating anticoagulant, or other inhibitors that are not specific for coagulation factors.

Profile Information A profile is a group of laboratory tests that are ordered and performed together under a single Mayo Test ID. Profile information lists the test performed, inclusive of the test fee, when a profile is ordered and includes reporting names and individual availability.

Test IDReporting NameAvailable SeparatelyAlways Performed
11INTFXI Inhib Profile Tech InterpNoYes
F_11Coag Factor XI Assay, PYesYes

Reflex Tests Lists tests that may or may not be performed, at an additional charge, depending on the result and interpretation of the initial tests.

Test IDReporting NameAvailable SeparatelyAlways Performed
11AIHFXI Inhib Profile Prof InterpNoNo
11_ISFactor XI Inhib ScrnNoNo
GBETHGeneral Factor Bethesda Units, PNoNo

Testing Algorithm Delineates situations when tests are added to the initial order. This includes reflex and additional tests.

Testing begins with coagulation factor XI activity assay with dilutions to evaluate assay inhibition; if the factor XI activity assay is normal or increased, then a technical interpretation will be provided.


If the factor XI activity assay is decreased, then an inhibitor screen will be performed at an additional charge to look for specific factor XI inhibition and a professional interpretation will be provided. If specific inhibition is apparent, the titer of the inhibitor will be determined.

Special Instructions Library of PDFs including pertinent information and forms related to the test

Method Name A short description of the method used to perform the test

Optical Clot-Based

NY State Available Indicates the status of NY State approval and if the test is orderable for NY State clients.


Reporting Name Lists a shorter or abbreviated version of the Published Name for a test

Factor XI Inhib Profile, P

Aliases Lists additional common names for a test, as an aid in searching

Factor XI Inhibitor Screen, Plasma