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FACTOR X CHROMOGENIC ASSAY

Mnemonic

F10C

Synonym

Factor X Chromo - Chromogenic Factor X

Guidelines

This test is indicated to monitor oral anticoagulant therapy, especially in patients whose plasma contains lupus anticoagulants and in patients receiving the drug Argatroban.

Specimen Collection Requirements

Collect

Platelet-Poor Plasma, one light blue (3.2% sodium citrate) top tube

Handling

For detailed specimen collection and handling requirements, refer to Coagulation Specimen Collection Guidelines.

CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.

Preferred Volume

Two 1.0 mL aliquots

Minimum Volume

One 1.3 mL blue top tube

Transport

CRITICAL FROZEN

Rejection Criteria

Gross hemolysis or gross lipemia

Stability

Frozen: 14 days

Testing Information

Note

Liver disease and vitamin K deficiency may lower factor X levels. If factor X deficiency is suspected, order Coagulation Factor X Activity Assay, Plasma.

Performed

Mon - Fri

Reported

2-5 days

Method

Chromogenic

Referral Lab

Mayo (FXCH)

Reference Values

Reference Values

60-140%

A chromogenic factor X activity of approximately 20% to 35% corresponds to the usual warfarin therapeutic INR range (ie, INR = 2.0-3.0).

CPT Codes

85260

Last Updated: Thursday, January 5, 2017 03:41:03 AM


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