ARUP's Laboratory Test Directory

0030115: Factor XII, Activity

Test Mnemonic: F12
Methodology: Clotting

Performed: Mon, Wed, Fri

Reported: 1-4 days

Specimen Required:  
Collect: One 5 mL lt. blue (sodium citrate).  Refer to the Hemostasis/Thrombosis Specimens section in the front of this User's Guide for special collection instructions.

Transport: 2 mL platelet-poor plasma, frozen. (Min: 1 mL) Submit specimen in an ARUP Standard Transport Tube.

Pediatric Collection/Transport: 1 mL platelet-poor plasma, frozen.

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

Unacceptable Conditions: Serum.  Nonfrozen or hemolyzed specimens.

Stability: Ambient: 4 hours; Refrigerated: 4 hours; Frozen: 2 weeks

Reference Interval:
58-166%

CPT Code(s):
85280