Vitamin D Blood Test

Vitamin d blood test is done to measure Vitamin D levels in body.
Testing is required to diagnose rickets in children and osteomalacia in adults which presents as bone deformity and increase risk of fracture. Levels are also estimated to monitor vitamin D replacement therapy.
Low vitamin D levels can help diagnose a case of  secondary hyperparathyroidism.
Often Vitamin D levels are tested along with serum calcium, phosphorous, parathyroid hormone.
For patients with renal diseases 1,25 dihydroxy vitamin D should be tested

Vitamin d blood test measures level of 25 hydroxy vitamin D total

During a vitamin d blood test, a health care professional will take a blood sample from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial. You may feel a little sting when the needle goes in or out. This usually takes less than five minutes.

Low levels of Vitamin D are associated with  osteoporosis, bone weakness and increased chance of fractures. Severe deficiency can lead to Rickets and osteocalcin.
Very high levels are associated with nausea, vomiting, poor appetite, constipation, weakness