Vitamin D 25 Hydroxy Test

Vitamin D 25 Hydroxy Test

Biochemistry

Test Schedule:

Daily

Report Collection:

Same Day

Test Overview

Test Components

This assay measures both D2 and D3 components.

Vitamin D Blood test (25-hydroxyvitamin D)

Vitamin D is a vital vitamin for our body that promotes calcium and phosphorus absorption; it keeps bones, teeth, and muscles healthy. It protects against osteocalcin, osteoporosis. Vitamin D blood test helps to measure the level of vitamin D in the body. The most common vitamin D test is the 25-hydroxyvitamin D, known as 25(OH) Vitamin D

When is the Vitamin D test done?

A doctor may advise this test

  • To monitor the functioning of the parathyroid gland, Parathyroid hormone activates Vitamin D.
  • Screen the people who are at high risk of deficiency.
  • In patients having an abnormal level of calcium, phosphorus.
  • Evidence of bone disease or bone weakness
  • Before starting the drug treatment for osteoporosis
  • Patients suffering from cystic fibrosis, Crohn's disease

What are the components of the Vitamin D test?

The main component checked in this test is Vitamin D.  Two forms of this vitamin can be measured

  • 25-hydroxyvitamin D
  • 1,25-dihydroxyvitamin D. 

The 25-hydroxyvitamin D is the primary form of vitamin D in the blood and is considered the best indicator of Vitamin D's nutritional status. Vitamin D is influenced by exposure to sunlight, skin pigmentation, sunscreen use, and hepatic function. The assay measures both vitamin D2 and D3 metabolites of vitamin D.

Procedure and Prerequisites

No special preparation is required. Blood is collected from the vein.

Reference Range

Deficient <15mg/ml
Insufficient 15-20 mg/ml
Sufficient 20-100 mg/ml

Decreased level indicates-

  • Inadequate exposure to sunlight
  • Dietary deficiency
  • Vitamin D malabsorption

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