Ordering Recommendation

Order to diagnose factor IX deficiency (hemophilia B) and monitor factor IX replacement therapy.

Mnemonic

F9

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 15-91% 7-9 years 70-133%
5-29 days 15-91% 10-11 years 72-149%
30-89 days 21-81% 12-13 years 73-152%
90-179 days 21-113% 14-15 years 80-161%
180-364 days 36-136% 16-17 years 86-176%
1-5 years 47-104% 18 years and older 78-184%
6 years 63-89%

Interpretive Data



Compliance Category

Standard

Note

Hotline History

N/A

CPT Codes

85250

Components

Component Test Code* Component Chart Name LOINC
0030100 Factor IX, Activity 3187-2
* 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 B
  • Christmas Factor
  • Coagulation Factor IX Activity Assay, Plasma
  • Intrinsic Factor Proteins
  • Intrinsic Factors
  • Plasma Thromboplastin Component
  • PTC
Factor IX, Activity