Coagulation & Hemostasis Laboratory 

We now perform the Platelet Function Assay Test (PFA).The PFA test is a new laboratory screening test of platelet function that measures both platelet adhesion and aggregation (primary hemostasis). Common clinical applications include the following:

  • Preoperative evaluation of platelet function
  • Evaluation of women with menorrhagia
  • Determining the presence of drug-induced platelet dysfunction
  • Determining patient compliance with aspirin and other antiplatelet drugs
  • Determining platelet functionality in high-risk pregnancy
  • Evaluation of patients with suspected inherited or acquired platelet disorders, such as von Willebrand disease (vWD)
  • Evaluation of the bleeding patient
  • Monitoring DDAVP treatment in patients with Type I vWD

For more information, you may download our PFA-100 FAQ PDF Logo


About our Clinical Laboratory
The Coagulation and Hemostasis Laboratory offers expert interpretations of coagulation profiles and consultations in the diagnosis of coagulation diseases and disorders. We offer a wide range of tests, using advanced and progressive technology. 


For detailed information on the tests, specimen collection 
requirements and handling, a test schedule and turn around time, please refer to our Collection Requirements page and our Coagulation Test Table


We also offer Consultative Services regarding patients whose samples have been tested in this laboratory.


Hours of Operation
The Coagulation Laboratory is staffed 24 hours a day, 7 days a week, to perform routine Coagulation testing (PT, APTT, Fibrinogen, and D-Dimer). Any non-routine testing is performed Monday through Friday from 8 AM to 4 PM (EST), excluding national holidays. Please call within these hours with any questions for prompt service and response (804-628-5736). 


Turnaround Time
The turnaround time for each test can be found in the individual test description. For further details or to request ASAP testing in a emergency situation, please contact the Coagulation Laboratory. 


Specimen Handling 
Client Services 804-828-PATH (828-7284); 1-800-363-923

Coagulation tests are extremely sensitive to methods of collection and preservation. It is important that the sample collection and processing instructions be followed so accurate test results can be obtained. 


Unacceptable Specimen Samples
Samples which are incorrectly collected, labeled, processed, or transported will not produce accurate results. When a sample is not acceptable, you will be notified by telephone.


If you have any question prior to collection or transportation of a sample, please contact the Coagulation Laboratory at (804) 628-5736 for more information. 


The Clinical Pathology Receiving area is located on the 6th floor of the Clinical Support Center (CSC) building at 403 N 13th Street in Richmond, VA; phone (804) 828-6767.


Test Results 
Test results will be phoned and faxed by the Coagulation staff to the ordering institution upon completion of testing. Pathology Client Services will auto fax the test results to the ordering institution. These results should be received the next business day after test completion. If you would like results mailed to an additional person, please include this information on the test requisition form. 


Lab Leadership and Contact Information
For information contact (804) 628-5736.


For further inquiry contact: 
Roger S. Riley, MD, PhD
Director of Coagulation 
(804) 628-5780

Sheela Pai
Medical Technologist Senior