Serum Vitamin C (Ascorbic Acid) Concentration

Why Might This Test Be Ordered?

Your healthcare provider may recommend this test if you have symptoms of vitamin C deficiency, such as fatigue, frequent infections, or slow wound healing. It may also be used to monitor vitamin C levels in people taking supplements or those with certain medical conditions that affect nutrient absorption, like malabsorption syndromes or chronic illnesses.

What Does a Low or High Level Mean?

Low levels of vitamin C might indicate deficiency, which can weaken your immune system or cause skin problems. High levels are less common but could be due to excessive supplementation or certain medical conditions. Your results will be discussed with your doctor to determine the best next steps.

How Is This Test Done?

A blood sample is taken from a vein in your arm. The blood is then sent to a lab where it is processed to measure vitamin C levels using a specialized analytical method.

What Are Common Causes of Low Vitamin C?

Conditions like smoking, certain medications, or malabsorption issues (such as celiac disease or Crohn’s disease) can lead to lower vitamin C levels. Dietary deficiencies, especially in areas with limited access to fresh fruits and vegetables, are also common causes.