see individual tests
Study to determine Protein C or Protein S causes of venous thrombosis.
Interpretive report provided for abnormal results
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
see individual tests
Days Test Performed
Soft Order Code
Update Type: New Tests
Updated Date: 04/09/2020
Looking to Order a Test?
We’ve provided helpful links to make ordering easy.
All specimens should be accompanied by a requisition.
Learn about how to properly label and where to ship specimens.
MLabs provides all the supplies necessary for the collection of specimens.
Visit our provider FAQ and learn about common questions to ordering tests.
Offsite Collection Instructions
Collect specimens in 3 blue top (citrate 3.2%) tubes. Mix by inversion. Specimens should arrive at the lab within 3 hours of collection; transport at room temperature. Alternatively, centrifuge, aliquot plasma into 3 plastic tubes, and freeze the specimen within 4 hours of collection. Transport frozen specimens on dry ice. Collection of the blood through lines that have been previously flushed with heparin should be avoided. If the blood must be drawn through a VAD (vascular access device), the line should be flushed with 5 mL of saline and the first 5 mL of blood or six dead space volumes of the VAD discarded.
Please provide clinical history (brief description of the reason for testing, e.g., history of easy bruising and menorrhagia, family history of von Willebrand disease) and a listing of current and recent medications, including oral contraceptives, anticoagulants, and factor replacement therapy/DDAVP.
Specimens will be rejected if not properly filled, clotted, grossly hemolyzed, or contaminated with heparin.
Not indicated for patients receiving anticoagulant therapy, or immediately following an acute thrombotic event.
3 full 2.7mL tubes or 7mL plasma (three 1mL aliquots)
3 full 1.8mL tubes or 7mL plasma (three 1mL aliquots)
Panel designed for MLabs clients includes Activated Protein C Resistance Assay, Protein C Activity, and Protein S Antigen, Free. Test may include pathologist interpretation of results at an additional charge. By ordering this test, the clinician acknowledges that a pathologist interpretation will be performed and billed as a separate additional charge if indicated.