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Test Code FA13 Factor XIII (13) Screen

Specimen Type



Two 3.2% light blue top tubes

Preferred Volume

5.4 mL

Offsite Collection Instructions

Whole blood sample must arrive in the laboratory within three hours of specimen collection.


If transport time exceeds three hours, follow centrifugation instructions:

  • Samples must be centrifuged at >1500 x g for 10 minutes at room temperature.
  • Carefully remove the plasma from the cells using a plastic transfer pipette avoiding the buffy coat.
  • Aliquot removed plasma into 2 plastic tubes containing a minimum of 1.0 mL of specimen in each tube.
  • The plasma samples must then be frozen at -20ºC.
  • Once solidly frozen, they must be shipped on dry ice. Samples that have thawed in transit will be rejected.

Note: For clients who do not have access to dry ice DO NOT freeze the specimen. Follow the centrifugation instructions and send fresh plasma or send whole blood sample. It now becomes vital that the specimen arrives in the lab within three hours of collection.

UCMC Collection Instructions

Specimens can be collected 24/7. Samples received in the lab after 12:00 pm (Monday-Thursday) will be run the next morning. Samples received after 12:00 pm on Friday will be run on Monday morning.


Collect 24/7, run Monday – Friday 8:00 am to 12:00 noon

Turnaround Time

30 hours

STAT Availability

Not Available

Test Usage

To screen for rhe presence of Factor XIII

Test Methodology


Additional Information

All 3.2% sodium citrate light blue top tubes require a ratio of 9 parts blood to 1 part anticoagulant (example: a 3.0 mL tube requires 2.7 mL blood added to 0.3 mL of anticoagulant).


This test is only a screening assay.  It only can determine if the patient has <1% or >1% Factor XIII (13) activity.

CPT Code


Test Includes

Factor XIII Screen

Reference Range


Minimum Volume

5.4 mL

Fee Code