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This Vitamin D 25-Hydroxy Blood Test, or calcidiol test, measures the amount of vitamin D2 (vitamin D 25-hydroxy or calcidiol) in the blood. It is the preferred test to diagnose potential vitamin D deficiencies. Vitamin D deficiencies can lead to more serious conditions including osteomalacia and hypocalcemia and signs include weakness, fatigue, and various aches and pains. Sunlight, fish, and vitamin D milk are excellent sources of vitamin D and are suggested remedies for those needing a vitamin D boost. Pinpoint the source of these symptoms by taking our reliable Vitamin D 25-Hydroxy Test.