Factor 13 Antigen Subunit A

Abbrev Code:F13A   
Order Code:LAB6599Order Name:Factor 13 Antigen Subunit A
Synonyms:Factor 13 Antigen Subunit A; Factor 13A; Factor XIII Antigen
CPT Codes: 85290 x1, 85290 x1
Turnaround Time:Turnaround time is 7 days, testing performed 1 day per week (Wednesday or Thursday). With pre-notification, STATs are done within 1 hour after receipt in the testing laboratory.
Associated Links:

Specimen Collection and Processing for Coagulation Specimens

Collection Instructions

Optimal Volume:2.7 mL (in 3 mL tube) - filled to fill line on the tube.
Container:Blue Na Citrate, 3.2% - fill to fill line on tube
Collection Instructions:See link to Specimen Collection and Processing for Coagulation Specimens.
Causes for Rejection:Underfilled tubes, overfilled tubes, clotted specimens, not received or processed and frozen within 4 hours of collection or, specimen thawed during transit. Grossly hemolyzed, icteric or lipemic specimens.

Processing and Shipping

Specimen Processing:
  • Process for Platelet Poor Plasma within 4 hours of collection.
  • Aliquot plasma, place clear tape around label, and freeze at -20C or on dry ice within 4 hours of collection.
  • If multiple tests are collected on 1 blue top, split each blue top into 2 aliquots. Minimum 0.5 mL per tube.
  • A maximum of 6 aliquots are needed per collection.
See link to Specimen Collection and Processing for Coagulation Specimens.
Shipping Instructions:
  • Ensure specimen is frozen before shipping.
  • Ship on dry ice, sample must remain frozen during shipping.
See link to Specimen Collection and Processing for Coagulation Specimens.
Test Performed at or Referral Lab UM Special Coag (K)  (UMMC East Bank)


Critical Range:Less than 10%
Reference Range:

1-4 d


5-29 d


30-89 d


90-179 d


180-364 d


1 y and older


Age specific reference ranges have not been established for newborns less than 1 day old.


Use:Factor XIII is essential for maintaining hemostasis due to its role in fibrin stabilization and in the protection of fibrin from proteolytic degradation by the fibrinolytic system. In addition, Factor XIII is also involved in maintaining pregnancy and wound healing.

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