Manufacturer Description Specimen Used Need to send sample to lab
ZRT Laboratory Detects vitamin D deficiency by measuring 25(OH)D found in the blood. Blood Yes
Direct Labs Test is used to determine if bone weakness, bone malformation, or abnormal metabolism of calcium (reflected by abnormal calcium, phosphorus or PTH tests) is occurring as a result of a deficiency or excess of vitamin D. Blood Yes
Dr. Soram Khalsa Detects vitamin D deficiency by measuring 25(OH)D found in the blood. Blood Yes