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Test Code F10 Factor X (F10) Assay

Collection Container

Light Blue

Specimen Required

Platelet poor plasma, whole blood if received in laboratory within 4 hours of collection

Specimen Volume

Platelet poor plasma: 1 ml aliquot, Whole blood: 2.7 mL

Minimum Specimen Volume

Platelet poor plasma: 0.5 mL, Whole blood: 2.7 mL.

Special Handling Instructions

Spin down, remove plasma and spin again. Double centrifued specimen is critical for accurate results as platelet contamination may cause spurious results.

Transport Temperature

Platelet poor plasma: frozen, whole blood: ambient temperature

Specimen Stability

Whole blood: 4 hours

Reasons for Rejection

Hemolyzed, clotted, Whole blood >4 hours old


Prothrombin clot based assay

Reference Ranges


Turnaround Time

1-3 days, depending on receipt in laboratory

CPT Code


Units of Measure


Days and Times Performed

7 AM-3 PM, Monday-Friday