ARUP's Laboratory Test Directory

Protein C, Functional : 0030113

Mnemonic: PROT C F

Methodology: Clotting
Performed: Sun-Sat
Reported: 1-2 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 specimen collection instructions.

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

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

Unacceptable Conditions:  Serum and nonfrozen or hemolyzed specimens.

Stability:  Ambient: 2 hours; Refrigerated: 4 hours; Frozen: 2 weeks
Reference Interval:
1-4 days: 17-53%
5-29 days: 20-64%
30-89 days: 21-65%
90-179 days: 28-80%
180-364 days: 37-81%
1-6 years: 40-92%
7-9 years: 56-144%
10-11 years: 59-143%
12-13 years: 57-142%
14-15 years: 56-162%
16-17 years: 68-154%
18 years and older: 77-173%
Interpretive Data: Patients on oral anticoagulants will have decreased functional protein C/S values. Patients should be off oral anticoagulant therapy for two weeks for accurate measurement of functional protein C/S levels.

Interfering Factors: Artifactually decreased functional protein C values may be seen in patients with abnormally elevated levels of factor VIII. Artifactually increased levels of functional protein C/S values may be seen in patients on heparin therapy.
CPT Code(s): 85303
 
 

 

 

 
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