Vitamin C (ascorbic acid) is a water-soluble vitamin that serves as a powerful antioxidant and is essential for collagen synthesis, wound healing, iron absorption, and immune system function. This test measures vitamin C levels in the blood to evaluate nutritional status and diagnose deficiency. Vitamin C deficiency can lead to scurvy, a condition characterized by bleeding gums, easy bruising, poor wound healing, and in severe cases, death. Low vitamin C levels are common in individuals with poor dietary intake, smokers, alcoholics, and those with malabsorption disorders. Vitamin C is particularly important for maintaining healthy connective tissue, blood vessels, and skin. This test is commonly ordered when evaluating patients with unexplained bleeding, poor wound healing, or symptoms of malnutrition. Early detection and treatment of vitamin C deficiency can prevent serious complications and improve overall health outcomes.