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What is a VITAMIN D 25-HYDROXY?

A vitamin D 25-hydroxy test is a blood test that measures the level of the circulating form of vitamin D, called 25(OH)D. It’s done to assess whether you have enough vitamin D for healthy bones and overall health, or to diagnose deficiency or insufficiency. Results help guide supplementation decisions and monitor treatment, especially if you have risk factors like limited sun exposure, malabsorption, darker skin, or certain medical conditions.

Additional Information

Also known as/ Other names: 25-hydroxyvitamin D test, 25(OH)D test, 25-hydroxycholecalciferol test, 25(OH) vitamin D total, Vitamin D, total (25-hydroxy)
Parameters: 1
Recommended for: M/F/Others
Sample Type: Blood
Patient Preparation: No prior preparation is needed
Reports: Same Day

FAQs

When should I get tested?

If you have limited sun exposure, dark skin, malabsorption, certain medical conditions, or are starting/adjusting vitamin D supplementation. Your healthcare provider may also test during bone health assessments.

Can vitamin D levels be affected by season or geography?

Certainly, levels often vary with sun exposure, latitude, season, and skin complexion.

Do vaccines affect test results?

No. Vaccination does not alter 25(OH)D levels or cause a false positive/negative.

How is the sample collected?

The sample is collected through a simple blood draw, usually from a vein in the arm.

Can a vitamin D test be done at home?

Vitamin D test at home or your nearest location can be possible by collection of samples with a home collection facility. The home collection facility enables you to get vitamin D tests near your preferred area or location and is convenient and easy.

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