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This test measures the level of protein C in your blood. Protein C helps your blood clot normally.
If you have too little protein C, called a protein C deficiency, it means that your blood may clot too much. Problems with blood clotting can be quite serious and possibly fatal if a blood clot reaches the lungs, a condition called pulmonary embolism.
Having too much protein C may not let your blood clot well. You may be at risk for bleeding.
Protein C deficiency is an inherited condition. It can cause mild or severe symptoms. About one in 500 people has a mild protein C deficiency, and about one in 4 million babies is born with a severe protein C deficiency.
Even people with mild protein C deficiency are at risk for serious blood clots that can be caused by:
Not moving around frequently
You might have this test if you:
Had a blood clot in the past
Have a family member with a protein C deficiency
Have a family member with a blood clotting disorder
Have blood that does not clot normally
Your doctor may look for any other abnormalities in your blood that could explain your blood clotting problems.
Many things may affect your lab test results. These include the method each lab uses to do the test. Even if your test results are different from the normal value, you may not have a problem. To learn what the results mean for you, talk with your health care provider.
A normal level of protein C in the blood is between 70 and 140 percent. Lower-than-normal readings may mean that you have a protein C deficiency.
A lower-than-normal level of protein C may be caused by:
Blood-thinning drugs, such as warfarin
Deficiency in vitamin K
Inherited protein C deficiency
Condition that causes the blood to clot too much, called consumptive coagulopathy
The test requires a blood sample, which is drawn through a needle from a vein in your arm.
Taking a blood sample with a needle carries risks that include bleeding, infection, bruising, or feeling dizzy. When the needle pricks your arm, you may feel a slight stinging sensation or pain. Afterward, the site may be slightly sore.
Taking certain medications may affect your test results. If you take a drug called stanozol or oral contraceptives, you may have a higher-than-normal level of protein C in your blood.
Your doctor will tell you if you need to stop taking any of your normal medications on the day of the test. Ask your doctor whether you should avoid eating or drinking anything for several hours before the test. Be sure your doctor knows about all medicines, herbs, vitamins, and supplements you are taking. This includes medicines that don't need a prescription and any illicit drugs you may use.
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