General Information

UPHSM LIS Test #: 7062
Schedule: Monday - Friday
Testing Time: Varies
Testing Lab: Mayo Labs

Specimen Info
Only 1 specimen type required, unless otherwise specified

Volume: 3.0 mL citrated Plasma
Temperature: Frozen
Tube Type: 1 Light Blue Citrate tube
Collection Info:
3 mL Plasma in 3 plastic vials each containing 1 mL of plasma.

1. Specimen must be drawn prior to factor replacement therapy.
2. Spin down, remove plasma, and spin plasma again.
3. Freeze specimens immediately at < or = minus 40 degrees C, if possible.
4. Send specimens in the same shipping container.
Additional Information:
1. Double centrifuged specimen is critical for accurate results as platelet contamination may cause spurious results.
2. If priority specimen, mark request form, give reason, and request a call back.
3. Each coagulation assay requested should have its own vial.


Activated Partial Thromboplastin Time-Based Clotting Assay Automated Latex Immunoassay (LIA) Latex Particle Enhanced Immunoassay Ristocetin Induced Aggregation of Washed Normal Platelets Agarose Gel Electrophoresis/Infrared Dye-Labeled Antibody Detection

CPT Codes

85240-Coagulation factor VIII assay
85246-von Willebrand factor antigen
85397-von Willebrand factor activity
85245-von Willebrand factor ristocetin cofactor activity (if appropriate)
85247-von Willebrand factor multimer (if appropriate)
85335-Bethesda titer (if appropriate)
85335-Coagulation factor VIII inhibitor screen (if appropriate)
85390-26-Special Coagulation interpretation (if appropriate)

* 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

AN interpretive report will be sent.