COAGULATION FACTOR VII ACTIVITY ASSAY, PLASMA
Marquette General Health System

General Info

HLAB/HOL Code

   FAC7

MGH LIS Test No

   996

Schedule

   Monday through Friday

Testing Time

   1 day

Testing Lab

   Mayo Labs

QORR Test Code

   FAC7

Specimen Info

Type

      

Volume

    

Temperature

   Frozen

Preservative

    

Collection Info

   See special instructions on "Coagulation Studies."
 
1. Draw blood in light blue-top (citrate) tubes.  Spin down, remove
   plasma, spin plasma again, and place 1.0 mL of citrate platelet-
   poor plasma in plastic vial.  (Glass vials cannot be accepted.)
   NOTE:  A. Patient must not be receiving heparin.
             therapy.
          B. Double-centrifuged specimens are critical for accurate
             results as platelet contamination may cause spurious
             results.
2. For factors V, VIII, XI, and XII, draw blood in light blue-top
   (citrate) tube as a control specimen from a normal, unrelated person
   at the same time.  Spin down, remove plasma, spin plasma again, and
   place 1.0 mL of citrate platelet-poor plasma in plastic vial.
   Label clearly on outermost label NORMAL CONTROL.
   NOTE:  Double-centrifuged specimens are critical for accurate
          results as platelet contamination may cause spurious results.
3. Freeze patient and control specimens immediately at < or = -40
   degrees C, if possible.
4. Send patient and control specimens frozen on dry ice in the same
   shipping container.
   NOTE:  Each coagulation assay requested should have its own
          separate set of patient and control vials.
5. If priority specimen, mark requisition, give reason, and request
   a call-back.
NOTE:  1. Tests for ristocetin cofactor (9046) and von Willebrand
          antigen (9051) are recommended in conjunction with assay for
          factor VIII activity.
       2. Please complete a "Coagulation Request Form" and forward it
          with the specimen.  This form is supplied by Mayo Medical
          Laboratories.  Requisitions for this procedure cannot be
          processed unless the information requested is supplied.      
 
Specimen Acceptability

Methods
Prothrombin Time-Based Assay COAGULATION TESTING IS HIGHLY COMPLEX, OFTEN REQUIRING THE PERFORMANCE OF MULTIPLE ASSAYS AND CORRELATION WITH CLINICAL INFORMATION. FOR THAT REASON, WE SUGGEST ORDERING "COAGULATION CONSULTATIONS".

Clinical Utilities

CPT Codes
85230

The CPT codes provided are based on AMA guidelines
and are for informational purposes only. CPT coding is the
sole responsibility of the billing party. Please direct any questions
regarding coding to the payer being billed.

Reference Range
Adults: 65-180%

Component Information

Collection Notes

Additional Comments

 

Questions or Comments email support@mgh.org

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