Test Details: Vitamin C (Ascorbic acid) is a water soluble vitamin, which is not produced in the human body yet is essential to its functioning. It is available through dietary sources, with citrus fruits being the major sources of Vitamin C. It is helpful in protein metabolism and is necessary for the synthesis of neurotransmitters, L-carnitine, and collagen in the body, as well as in the regeneration of vitamin E. It also plays a pivotal role in immune system function and also in the absorption of non-haeme iron. An assessment of the levels of vitamin C helps in the blood proves useful in assessing the nutritional status of an individual.