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A homocysteine test measures the amount of the amino acid homocysteine in the blood.
A homocysteine blood test is done to:
Help identify vitamin B12 deficiency or folic acid deficiency. But other tests for these deficiencies are available.
Help identify a rare inherited disease (homocystinuria) that causes a deficiency of one of several enzymes needed to convert food to energy.
Help determine a cause for otherwise unexplained blood clots.