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Test Code F10T Factor X Inhibitor Titer

Specimen Type

Plasma

Container/Tube

Light blue top tube, 3.2% sodium citrate

Offsite Collection Instructions

  • Samples must be centrifuged at >1500 x g for 10 minutes
    at
    room temperature.
  • Carefully remove plasma from the cells using a plastic
    transfer
    pipette avoiding the buffy coat.
  • Aliquot the removed plasma into 2 plastic tubes containing
    a
    minimum of 1000 uL of specimen in each tube.
  • The plasma samples must then be frozen at -20C.
  • 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 or
    send
    the whole blood sample. It now becomes vital that the specimen
    arrives in the lab within three hours of collection.

Turnaround Time

Monday to Friday: 20 hours.

Test Includes

The test includes Factor X inhibitor titer

Preferred Volume

2 mL

UCMC Collection Instructions

Sample may be collected at anytime. 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.

Test Usage

Bethesda assay for Factor X inhibitor titers generally
performed only in the setting of significantly decreased levels
of
Factor X.

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).

Fee Code

30685335

Synonyms

Factor X (10) Inhibitor Titer

Critical Results

n/a

STAT Turnaround Time

n/a

Specimen Minimum Volume

1 mL

DAY(S) AND TIME(S) PERFORMED

Monday - Friday, 8:00 am to 12:00 noon

STAT DAY(S) AND TIME(S) PERFORMED

Not Available

CPT

85335

Method Name

Clotting

Reference Values

<0.6 Bethesda Units

Reject Due To

Specimens that have wrong ratio of blood to anticoagulant
(over
drawn or under drawn) clotted or grossly hemolyzed.