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Some drugs that stop clots from forming (anticoagulants), such as warfarin (Coumadin) can decrease protein C and protein S levels. Health care providers may find it difficult to read protein C or S measurements in patients taking anticoagulants.
Clot events such as a clot in the lung (pulmonary embolism) reduce protein C and S levels, and their measurements may be misleading until the clot is treated.
Veins and arteries vary in size from one patient to another and from one side of the body to the other. Getting a blood sample from some people may be harder than from others.
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