Ordering Recommendation

Order to diagnose factor IX deficiency, detect factor IX inhibitors, and monitor factor IX replacement therapy.


Electromagnetic Mechanical Clot Detection




1-3 days

New York DOH Approval Status
This test is New York DOH approved.
Specimen Required
Patient Preparation

Lt. blue (sodium citrate). Refer to Specimen Handling at aruplab.com for hemostasis/thrombosis specimen handling guidelines.

Specimen Preparation

Transfer two 3 mL aliquots of platelet-poor plasma to two ARUP Standard Transport Tubes. (Min: 2 mL/each)

Storage/Transport Temperature

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

Unacceptable Conditions

Serum. EDTA plasma, clotted or hemolyzed specimens.


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

Reference Interval
Test Number
Reference Interval
0030100 Factor IX, Activity
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%

Bethesda Quantitative, Factor IX Effective May 19, 2014
0.4 BU or less

Interpretive Data

No compliance statements are in use for this test.


If Factor IX activity is 20 percent or less, then Bethesda Quantitative, Factor IX will be added. Additional charges apply.

Hotline History
CPT Codes

85250; if reflexed, add 85335

Component Test Code* Component Chart Name LOINC
0030033 Bethesda Quantitative, F9 3185-6
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.
  • Bethesda Quantitative Factor IX
  • Coagulation Factor IX Inhibitor, Plasma
  • Factor IX Inhibitor Concentration
  • Factor IX Inhibitor, Quantitative
  • Factor IX, Activity
Factor IX Activity with Reflex to Bethesda Quantitative, Factor IX