ARUP's Laboratory Test Directory

Factor II, Activity (Prothrombin) : 0030007

Mnemonic: F2

Methodology: Clotting
Performed: Mon-Fri
Reported: 1-4 days
Specimen Required: Collect: Lt. blue (sodium citrate). Refer to Specimen Handling at aruplab.com for hemostasis/thrombosis specimen handling guidelines.

Specimen Preparation: Transfer 2 mL platelet-poor plasma to an ARUP Standard Transport Tube. (Min: 1 mL)

Storage/Transport Temperature: CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.

Remarks:

Unacceptable Conditions: Serum. Non-frozen or hemolyzed specimens.

Stability (collection to initiation of testing): Ambient: 4 hours; Refrigerated: 4 hours; Frozen: 2 weeks
Reference Interval:
1-4 days: 26-70%
5-29 days: 33-93%
30-89 days: 34-102%
90-179 days: 45-105%
180-364 days: 60-116%
1-5 years: 71-116%
6 years:  67-107%
7-9 years: 78-125%
10-11 years: 78-120%
12-13 years: 72-123%
14-15 years: 75-135%
16-17 years: 77-130%
18 years and older: 86-150%
Note: Do not order for prothrombin mutation.
CPT Code(s): 85210
Cross References: Coagulation Factor II Activity Assay, Plasma (Factor II, Activity (Prothrombin)), Common Pathway Proteins, Factor II (Factor II, Activity (Prothrombin)), Prothrombin (Factor II, Activity (Prothrombin))