Vitamin Deficiency Test lab tests in LabsMD Lab Test Test Cost Vitamin A (Retinol) - Vitamin A blood test $60.00 Folate, RBC $42.86 Vitamin D, 1,25-Dihydroxy, LC/MS/MS - vitamin d test cost $88.57 Vitamin D, 25-Hydroxy LC/MS/MS - Vitamin D Blood Test $82.86 Vitamin B12 - Vitamin B12 Testing $38.00 Folate (Folic Acid) - Folate Blood Test $38.00 Homocysteine, Cardiovascular - Homocysteine Test $77.14 Vitamin B12 and Folates - Vitamin B12 deficiency blood test $50.29 Methylmalonic Acid - Methylmalonic Acid Test (Blood) $71.14