Vitamin D Test: Why Every Delhi Resident Should Check Their Levels

By Dashvanth Healthcare Medical Team · Reviewed by our specialists · East Delhi

The Delhi Vitamin D Paradox

Delhi receives abundant sunlight, yet 70–90% of its residents are Vitamin D deficient. This is one of the most important unrecognised health issues in the city — Vitamin D deficiency is linked to bone loss, muscle weakness, recurrent infections, depression, cardiovascular disease, diabetes, and certain cancers.

The Test: 25-OH Vitamin D

The correct test is serum 25-hydroxyvitamin D (25-OH Vit D or calcidiol). NOT the active form (1,25-dihydroxy Vitamin D) — this is a different, more expensive test used only for specific medical conditions.

Reference Ranges

• Deficient: Below 20 ng/mL (<50 nmol/L)
• Insufficient: 20–29 ng/mL
• Sufficient: 30–100 ng/mL
• Toxic: Above 150 ng/mL (rare with supplements)

Who Should Be Tested?

• People with bone pain, muscle weakness, or fatigue
• Recurrent fractures or osteoporosis
• Recurrent respiratory infections
• Autoimmune conditions (thyroid, RA, IBD)
• Depression or mood disorders
• Obesity (Vitamin D stored in fat, less bioavailable)
• Dark skin + indoor lifestyle (highest risk)

Supplementation Guide

• Mild deficiency (20–30 ng/mL): 2000 IU/day
• Moderate deficiency (10–20 ng/mL): 4000 IU/day
• Severe deficiency (<10 ng/mL): Stoss therapy — 60,000 IU weekly for 8–12 weeks, then maintenance
• Recheck after 3 months