Ordering Recommendation

Order to diagnose factor XI deficiency (hemophilia C).

Methodology

Electromagnetic Mechanical Clot Detection

Performed

Mon-Sat

Reported

1-3 days

New York DOH Approval Status

This test is New York DOH 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

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