What It Measures#
The Vitamin D test measures the level of 25-hydroxyvitamin D [25(OH)D] in your blood — the most accurate marker of your body's vitamin D status. Vitamin D is essential for:
- Calcium absorption and bone health — deficiency causes rickets in children and osteomalacia/osteoporosis in adults.
- Immune function — vitamin D modulates both innate and adaptive immunity.
- Muscle strength — low levels are linked to fatigue, muscle pain, and frequent falls in the elderly.
- Mood regulation — deficiency is associated with depression and seasonal affective disorder.
Despite abundant sunlight, 70–90% of Indians are vitamin D deficient, primarily due to indoor lifestyles, pollution, darker skin pigmentation, and limited dietary sources.
Who Should Get Tested#
- Anyone with unexplained fatigue, bone pain, muscle weakness, or frequent infections.
- Women above 30 — particularly at risk for osteoporosis.
- Elderly adults (above 60) — reduced skin synthesis of vitamin D.
- People with limited sun exposure (office workers, night-shift employees).
- Patients with thyroid disorders, PCOD, or autoimmune conditions.
- Pregnant and breastfeeding women.
- Anyone with recurrent fractures or low bone density on DEXA scan.
How to Prepare#
- No fasting required.
- No special preparation needed.
- Inform your doctor about vitamin D supplements, as they affect test interpretation.
Understanding Your Results#
| Vitamin D Level | Interpretation | |----------------|---------------| | Below 10 ng/mL | Severe deficiency — urgent supplementation needed | | 10–20 ng/mL | Deficiency — supplementation recommended | | 20–30 ng/mL | Insufficiency — may need supplements | | 30–100 ng/mL | Sufficient / Optimal | | Above 100 ng/mL | Toxicity risk (rare, from over-supplementation) |
Most Indian labs report values in ng/mL. The optimal target for most adults is 30–50 ng/mL. Your doctor will prescribe oral cholecalciferol (D3) sachets or capsules based on your level — typically 60,000 IU weekly for 8 weeks in deficiency, followed by monthly maintenance.
Related Tests#
- Vitamin B12 Test — often deficient alongside vitamin D.
- CBC — anaemia and vitamin D deficiency frequently coexist.
- Thyroid Function Test — thyroid and vitamin D share an autoimmune link.
- Iron Studies — iron deficiency is common in the same population.
Booking & Home Collection#
Book a Vitamin D test on PingMeDoc — no fasting, any time of day. Home sample collection across 50+ cities. Reports within 24–48 hours.