metaboliqBlood test explained
Vitamin D test: what your 25-hydroxy level means, and the normal range
Included in the ₹1,799 home panel: collected at home where your pincode is served, and read by a doctor.
Start my free checkVitamin D deficiency is one of the most common findings on Indian blood reports, sunshine or not. The test measures the body's stored form, and the number is read against thresholds that expert bodies draw slightly differently.
What it is
What the Vitamin D test measures
The test measures 25-hydroxyvitamin D, the form the liver makes from vitamin D taken in through skin exposure to sunlight, food or supplements. It circulates for two to three weeks, so it reflects the body's store rather than yesterday's sun.
The kidneys convert it into the active hormone that helps absorb calcium and supports bone and muscle. The active form is not the right test for deficiency, because its level is kept steady until stores are very low.
Why it matters
Why it matters for weight and metabolism
Vitamin D dissolves in fat, and people with more body fat tend to have lower blood levels, partly because more of it is held in fat tissue. Low vitamin D is also associated with muscle weakness, aches and tiredness, which make it harder to train.
What is not established is that correcting vitamin D reduces weight. It is on a metabolic panel because deficiency is common, easy to fix and relevant to muscle and bone, which a weight plan is trying to protect.
Reading the result
How a result is usually read
Standard reference points, not a reading of anybody's own report. The interval your laboratory prints is the one that applies, and a doctor reads the number beside the rest of the panel and your history.
- Below 20 ng/mL (below 50 nmol/L)
- Deficient, by the Endocrine Society's definition.
- 21 to 29 ng/mL
- Insufficient by the same definition; other bodies consider 20 ng/mL adequate for bone health.
- 30 to 100 ng/mL
- Sufficient by the Endocrine Society's definition.
- Well above 100 ng/mL
- Higher than needed; very high levels, usually from high-strength supplements taken without checks, can be harmful.
Sources: Endocrine Society clinical practice guideline, 2011; US National Academies (IOM) dietary reference intakes, 2011. To convert, 1 ng/mL equals 2.5 nmol/L. Your laboratory's printed interval applies.
At home
How it is collected at home
A phlebotomist from a partnered NABL-accredited laboratory draws one blood sample at your address, in a morning slot, and the laboratory reports the results to the doctor who reads your panel. Home collection depends on your pincode, which is checked before you pay.
No fasting is needed; it is drawn from the same sample as the rest of the panel.
If you already take a vitamin D supplement, tell the doctor what and how often, so the result is read as a level on supplementation rather than a baseline.
The Vitamin D test is part of the core of every Metaboliq panel, whatever else a doctor adds.
The limit
Its limits, stated plainly
A vitamin D level says nothing about calcium balance or bone density on its own, and it moves with season. It also cannot explain tiredness by itself: a low level and an underactive thyroid or low B12 often turn up together, which is why they are read side by side.
Read beside it
The tests a doctor reads with this one
A body is read as a whole. These are the results this one is most often read against.
- Vitamin B12 test
What a vitamin B12 test measures, how low and borderline levels are read, why vegetarian diets in India raise the risk, and what B12 does and does not do for energy.
- CBC test
What a complete blood count (CBC) shows — haemoglobin, red cell size, white cells and platelets — how anaemia is defined, and why it sits in a metabolic panel.
- Thyroid test
What a thyroid test measures: TSH, free T3 and T4 and anti-TPO antibodies, how the ranges are read, what the thyroid has to do with weight, and home collection.
Conditions it helps a doctor read
Questions
Questions people ask about the Vitamin D test
I get sun every day. Can my vitamin D still be low?
Yes, and in India it often is. Time indoors, darker skin, clothing that covers most of the body, air pollution and sunscreen all reduce how much vitamin D the skin makes, even in a sunny climate.
Can vitamin D be too high?
Yes. Levels far above the sufficient range, almost always from high-strength supplements taken without monitoring, can raise blood calcium and cause nausea, weakness and kidney problems. That is why correction is guided by a repeat test.
When should vitamin D be rechecked?
Because the stored form takes weeks to settle, a recheck is usually most informative about three months after a change. A doctor sets the timing.
One next step
Have it read by a doctor, with the rest of your panel
Health assessment: ₹1,799. Blood test, 45+ metabolic markers, Collected at your home, A doctor reviews your results, A decision on whether this is right for you, A nutritionist on your care team, Health Coach, A personalised plan around day 3. A registered doctor reads every result against your history and writes your plan.