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Test Code F9M Coagulation Factor IX Activity Assay, Plasma

Additional Codes

 

MAYO Test ID

F_9

EPIC Test ID

LAB308

 

Reporting Name

Coag Factor IX Assay, P

Useful For

Diagnosing deficiencies, particularly hemophilia B (Christmas disease)

 

Assessing the impact of liver disease on hemostasis

 

Investigation of a prolonged activated partial thromboplastin time

Testing Algorithm

See Hemophilia Testing Algorithm in Special Instructions.

Method Name

Activated Partial Thromboplastin Clot-Based Assay

Performing Laboratory

Mayo Medical Laboratories in Rochester

Specimen Type

Plasma Na Cit


Specimen Required


See Coagulation Studies in Special Instructions.

 

Specimen Type: Platelet-poor plasma

Collection Container/Tube: Light-blue top (citrate)

Submission Container/Tube: Plastic vial

Specimen Volume: 1 mL

Collection Instructions:

1. Spin down, remove plasma, and spin plasma again.

2. Freeze specimen immediately at ≤-40° C, if possible.

Additional Information:

1. Double-centrifuged specimen is critical for accurate results as platelet contamination may cause spurious results.

2. Patient must not be receiving Coumadin or heparin therapy.

3. Each coagulation assay requested should have its own vial.

4. If priority specimen, mark request form, give reason, and request a call-back.

5. Coagulation testing is highly complex, often requiring the performance of multiple assays and correlation with clinical information. For that reason we suggest ordering Coagulation Consultations.


Specimen Minimum Volume

0.5 mL

Specimen Stability Information

Specimen Type Temperature Time
Plasma Na Cit Frozen 14 days

Reject Due To

Hemolysis

Mild OK; Gross reject

Lipemia

Mild OK; Gross reject

Icterus

Mild OK; Gross reject

Other

NA

Reference Values

Adults: 65-140%

Normal, full-term newborn infants or healthy premature infants may have decreased levels (≥20%) which may not reach adult levels for ≥180 days postnatal.*

*See Pediatric Hemostasis References in Coagulation Studies in Special Instructions.

Day(s) and Time(s) Performed

Monday through Friday

CPT Code Information

85250

LOINC Code Information

Test ID Test Order Name Order LOINC Value
F_9 Coag Factor IX Assay, P 3187-2

 

Result ID Test Result Name Result LOINC Value
F_9 Coag Factor IX Assay, P 3187-2

Analytic Time

1 day

Test Classification

This test has been modified from the manufacturer's instructions. Its performance characteristics were determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.