Other immunoenzymatic tests

Vitamin B12 deficiency is associated with weakness, fatigue, mobility problems, joint pain, mouth ulcers, mood swings, impaired vision and memory, and in severe cases, depression.

The test is used to diagnose vitamin D deficiency or excess, and to assess whether abnormalities in laboratory tests reflecting calcium metabolism (calcium, phosphorus, parathyroid hormone (PTH)) are due to vitamin D deficiency or excess.