One of the most powerful antioxidants, vitamin C is essential for the health of each individuals body. It has been discovered that a shortage of vitamin C frequently causes a number of harmful problems. So, in many situations, it becomes very important for the doctors to be aware of the current Vitamin C level in a certain patient. Doctors will advise a patient to have a Vitamin C (Active) test in this circumstance. The only objective of the test is to quantify the amount of Vitamin C that is present in a blood sample. The test is also conducted throughout or following the course of treatment for vitamin C insufficiency.