Ordering Recommendation

Order to diagnose factor XI deficiency (hemophilia C).

New York DOH Approval Status

This test is New York state approved.

Specimen Required

Patient Preparation
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.

Unacceptable Conditions

Serum. EDTA plasma, clotted or hemolyzed specimens.

Remarks
Stability

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

Methodology

Electromagnetic Mechanical Clot Detection

Performed

Mon-Sat

Reported

1-3 days

Reference Interval

Age Reference Interval Age Reference Interval
1-4 days 10-66% 7-9 years 70-138%
5-29 days 23-87% 10-11 years 66-137%
30-89 days 27-79% 12-13 years 68-138%
90-179 days 41-97% 14-15 years 57-129%
180-364 days 38-134% 16-17 years 65-159%
1-5 years 56-150% 18 years and older 56-153%
6 years 52-120%

Interpretive Data



Compliance Category

Standard

Note

Hotline History

N/A

CPT Codes

85270

Components

Component Test Code* Component Chart Name LOINC
0030110 Factor XI, Activity 3226-8
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.

Aliases

  • Antihemophilic Factor C
  • Coagulation Factor XI Activity Assay, Plasma
  • F11
  • Factor XI Activity Assay
  • Intrinsic Factor Proteins
  • Intrinsic Factors
  • Plasma Thromboplastin Antecedent (PTA)
Factor XI, Activity