Sign in →

Test Code F7IT Factor VII 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.

Preferred Volume

2 mL

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.

Test Usage

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

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).
 

Samples that arrive after 12 noon on Monday-Thursday will be
kept until the next morning to be run.

Fee Code

30285335

Synonyms

FVII (7) IT; Factor VII (7) 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 a.m. 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.