Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Protein C deficiency ?
    ### Response:
    How is protein C deficiency diagnosed? A diagnosis of protein C deficiency might be suspected in someone with a deep venous thrombosis (DVT) or a pulmonary embolism, especially if it occurs in a relatively young person (less than 50 years old) or has formed in an unusual location, such as the veins leading to the liver or kidney or the blood vessels of the brain.
    