Vitamin D (25-OH) Test in Delhi
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Know More About the Vitamin D (25-OH) Test
The Vitamin D (25-OH) test, also called the serum 25-hydroxyvitamin D test, measures the total amount of 25-hydroxyvitamin D in the blood — the storage form of vitamin D and the most reliable indicator of overall vitamin D status in the body. It is the only test that accurately reflects both dietary intake and sun-derived vitamin D synthesis, making it the universally recommended marker for assessing deficiency, insufficiency, or adequate levels.
Vitamin D is a fat-soluble prohormone that, once activated in the kidneys, acts across virtually every tissue in the body. Its best-characterised role is regulating calcium and phosphate absorption in the intestine, which is essential for bone mineralisation. Deficiency leads to reduced calcium absorption, secondary hyperparathyroidism, and ultimately bone softening — causing rickets in children and osteomalacia in adults. Chronic deficiency is also a major contributor to osteoporosis and fragility fractures in older adults.
Reference ranges: Vitamin D status is classified as follows — levels below 10 ng/mL indicate severe deficiency; 10–19 ng/mL indicates deficiency; 20–29 ng/mL indicates insufficiency; 30 ng/mL and above is considered sufficient. Some clinical guidelines use 40 ng/mL as the optimal lower threshold for individuals with osteoporosis, malabsorption, or chronic illness. Toxicity (hypervitaminosis D) is rarely seen below 100 ng/mL and is typically the result of excessive supplementation rather than sun exposure.
Beyond bone health, vitamin D receptors are present in immune cells, the heart, the pancreas, muscles, and the brain. Low vitamin D has been associated with immune dysregulation (including increased susceptibility to respiratory infections), insulin resistance, cardiovascular disease, muscle weakness, and poor mood regulation. While causality is still being established for many of these associations, correction of frank deficiency broadly improves health outcomes.
Vitamin D deficiency is extraordinarily prevalent in India — studies show deficiency in 50–90% of urban Indians despite adequate year-round sun availability. The major reasons include limited sun-exposed skin area due to clothing, indoor lifestyles, dark skin pigmentation (which reduces cutaneous synthesis), high-rise apartments that block UVB, and widespread dietary insufficiency of vitamin D-rich foods in vegetarian populations.
No fasting is required. Any medications, including vitamin D supplements, can be continued before the test unless the purpose is to establish a true baseline before starting supplementation — in that case, pause supplements for at least a week before sampling.
Delhi's dense population — with high rates of indoor work, pollution-related sun avoidance, and poor dietary vitamin D intake across South Delhi, Dwarka, Rohini, East Delhi and the central districts — makes the 25-OH Vitamin D test one of the most clinically requested tests in the city. Book from ₹440 and compare NABL-accredited labs on HealthVas.
Who Should Get a Vitamin D (25-OH) Test
- People with Unexplained Bone Pain, Muscle Weakness, or Fatigue – Diffuse bone or muscle pain, proximal muscle weakness (difficulty climbing stairs or rising from a chair), and unexplained fatigue are hallmark symptoms of vitamin D deficiency. Testing confirms the diagnosis before supplementation is prescribed.
- Individuals with Osteoporosis or Low Bone Density – Vitamin D is essential for calcium absorption and bone mineralisation. Anyone diagnosed with osteoporosis, osteopenia, or fragility fractures should have their 25-OH D level checked as part of baseline workup and monitored during treatment.
- Vegetarians, Vegans, and People with Limited Dairy Intake – Vitamin D is naturally present in very few foods, and most dietary sources are animal-based — oily fish, egg yolks, liver, and fortified dairy. Individuals on plant-based diets or with low dairy consumption have limited dietary intake and are at elevated deficiency risk.
- Indoor Workers and People with Minimal Sun Exposure – Vitamin D is synthesised in the skin on exposure to UVB radiation. People who work indoors, cover their skin extensively outdoors, use high-SPF sunscreen consistently, or live in heavily polluted areas where UVB is filtered out are at high risk of sun-derived vitamin D deficiency.
- Pregnant and Breastfeeding Women – Vitamin D requirements increase during pregnancy and lactation. Maternal deficiency is associated with neonatal rickets, impaired fetal bone development, and gestational complications. Regular monitoring allows timely supplementation to protect both mother and child.
- Delhi Residents Seeking Preventive Health Checks – Urban Delhi's combination of indoor occupations, air-pollution-related sun avoidance, and predominantly vegetarian dietary patterns makes vitamin D deficiency a near-universal finding in first-time testers across South Delhi, Dwarka, Rohini, East Delhi and the central districts. A baseline test is advisable for any adult who has never had their level checked.
How to Prepare
No fasting is required for the Vitamin D (25-OH) test. Continue all regular medications and multivitamins unless the purpose of the test is to establish a true pre-supplementation baseline, in which case pause vitamin D supplements for at least a week before sampling. If you are already on a therapeutic vitamin D dose and want to check response, continue the supplement — the test is checking the level achieved.
HealthVas partner labs offer free home sample collection across Delhi-NCR — a trained phlebotomist visits your home or office at a time slot you choose, so there is no travel and no waiting room. Reports are delivered digitally and a branded copy can be shared directly on WhatsApp.
Why Compare Lab Prices on HealthVas?
Multiple NABL-accredited partner labs offer the Vitamin D (25-OH) test on HealthVas, and the price for the exact same test can differ widely from one lab to the next. Delhi has the densest concentration of NABL-accredited labs in NCR — and the price spread is widest here, meaning the difference between the most expensive and cheapest accredited option can be substantial.
NABL accreditation is the baseline standard for diagnostic accuracy in India — it certifies that a lab's equipment, reagents and reporting meet national quality benchmarks. Many partner labs additionally hold NABH, ISO or CAP certification, which add stricter internal quality controls. HealthVas shows you the accreditation alongside the price for each lab so you are comparing like with like, not just chasing the lowest number.
Unlike single-lab booking sites that only ever show you their own rate, HealthVas puts the accredited options side by side on one page. You see the lowest available price, the report turnaround, and whether free home collection is included — then book the lab that fits your budget and timeline.
Vitamin D (25-OH) Test — What to Know Before Booking
The Vitamin D (25-OH) test measures total serum 25-hydroxyvitamin D — the storage form of vitamin D that reflects both sun-derived synthesis and dietary/supplemental intake. It is the correct test for diagnosing deficiency and monitoring supplementation response. Do not confuse it with the 1,25-dihydroxyvitamin D test (calcitriol), which measures the active hormone and is used for specific kidney and parathyroid disorders — not for routine vitamin D status assessment.
No fasting required. Most labs report results within 24–48 hours. The result should be interpreted alongside calcium, phosphorus, PTH, and alkaline phosphatase when assessing bone health comprehensively.
Compare Vitamin D test prices from NABL-accredited partner labs on HealthVas and book with free home sample collection across Delhi-NCR.
Frequently Asked Questions
Common questions for this test.
What does the Vitamin D (25-OH) test measure?
The test measures serum 25-hydroxyvitamin D, the storage form of vitamin D in the body. It is the most accurate indicator of overall vitamin D status, reflecting contributions from both sunlight-driven skin synthesis and dietary or supplemental intake.
What is the normal range for Vitamin D?
Standard classification: below 10 ng/mL is severe deficiency; 10–19 ng/mL is deficiency; 20–29 ng/mL is insufficiency; 30 ng/mL and above is sufficient. Some guidelines recommend 40 ng/mL as the target for people with osteoporosis or malabsorption conditions. Levels above 100 ng/mL may indicate toxicity from excessive supplementation.
Do I need to fast for the Vitamin D test?
No fasting is required. You can eat and drink normally before the sample is collected. Continue all medications and supplements unless you specifically want a pre-supplementation baseline reading, in which case pause vitamin D supplements for about a week before the test.
What is the price of the Vitamin D (25-OH) test?
It starts at ₹440 on HealthVas, with the lowest current rate from Healthians. Prices vary across NABL-accredited partner labs — the live price for each is shown on the page.
Is home sample collection available for the Vitamin D test?
Yes. HealthVas partner labs offer free home sample collection across Delhi-NCR. A trained phlebotomist visits your home or office at the time slot you choose — no travel, no waiting room.
How long do Vitamin D test reports take?
Most partner labs deliver results within 24–48 hours of sample collection. The exact turnaround time for each lab is shown alongside the price on the HealthVas listing page.
Why is vitamin D deficiency so common in India despite abundant sunshine?
Despite year-round sun, urban India has very high deficiency rates — estimated at 50–90% in urban populations. Causes include indoor occupations, extensive skin coverage due to clothing, dark skin pigmentation (which reduces UVB synthesis efficiency), high-rise living that blocks direct UVB, air pollution filtering sunlight, and low dietary intake due to largely vegetarian diets.
What are the symptoms of vitamin D deficiency?
Common symptoms include bone pain, muscle weakness (particularly proximal muscles used for climbing or rising from chairs), fatigue, and a general sense of malaise. Severe or prolonged deficiency causes rickets in children (soft, deformed bones) and osteomalacia in adults (bone softening). However, many people with deficiency or insufficiency have no obvious symptoms at all, which is why testing is recommended for at-risk individuals.
Is the Vitamin D (25-OH) test the same as a Vitamin D3 test?
Yes, the 25-OH Vitamin D test measures total 25-hydroxyvitamin D, which reflects the combined contribution of D3 (cholecalciferol, from skin and animal foods) and D2 (ergocalciferol, from fortified foods and some supplements). It is the standard test for assessing vitamin D status and is what is meant by 'Vitamin D test' in clinical practice.
Why should I compare Vitamin D test prices across labs?
The same NABL-accredited Vitamin D (25-OH) test can vary significantly in price across labs in the same city. Comparing on HealthVas ensures you pay the lowest accredited rate without any compromise in accuracy or reporting.
Do I need a prescription to book the Vitamin D test?
No. The Vitamin D test does not require a prescription on HealthVas. You can book it directly for preventive screening or to monitor a known deficiency.
Are the labs on HealthVas NABL-accredited?
Yes. Every partner lab listed on HealthVas is NABL-accredited. NABL certification verifies that the lab's equipment, reagents, methods, and quality systems meet national standards for diagnostic accuracy.
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