Apollo Diagnostics | NABL-Certified Lab | No Fasting Required | Digital Reports on WhatsApp
What is a Vitamin D (25-OH) Test?
The Vitamin D (25-Hydroxy) test is the most accurate way to measure the actual amount of Vitamin D in your body. Often called the sunshine vitamin, Vitamin D is essential for the absorption of calcium and phosphorus — the building blocks of healthy bones. This test measures both Vitamin D2 (from food and supplements) and Vitamin D3 (produced by the skin in response to sunlight). Since many city residents spend significant time indoors, this test is crucial for identifying silent deficiencies that can impact long-term health.
✓ No fasting required — The Vitamin D test can be done at any time of day, with or without food. However, inform your phlebotomist if you are currently taking high-dose Vitamin D supplements as this helps your doctor interpret results accurately.
Why Vitamin D Monitoring is Essential
Vitamin D acts more like a hormone than a vitamin, influencing everything from bone density to immune function:
- Bone Health — Prevents Osteoporosis and Osteomalacia in adults and Rickets in children by regulating calcium absorption
- Immune Support — Adequate levels help the body fight respiratory infections and modulate autoimmune responses
- Identifying Deficiency Symptoms — Investigates the cause of chronic fatigue, unexplained bone pain, muscle weakness or mood changes like depression
- High-Risk Groups — Essential for elderly individuals, those with darker skin tones, and people with malabsorption conditions like Crohn's or Celiac disease
Normal Vitamin D Range
| Vitamin D Level | Interpretation |
|---|---|
| Above 50 ng/mL | Optimal – excellent Vitamin D status |
| 30 – 50 ng/mL | Sufficient – adequate for most people |
| 20 – 29 ng/mL | Insufficient – supplementation recommended |
| Below 20 ng/mL | Deficient – treatment required |
| Below 10 ng/mL | Severely deficient – urgent treatment needed |
| Above 100 ng/mL | Toxicity risk – excessive supplementation |
Your doctor will interpret your Vitamin D result alongside your Serum Calcium and clinical symptoms.
Who is at High Risk of Vitamin D Deficiency?
High-risk groups who should test regularly:
- Office workers and people with limited sun exposure
- Elderly individuals — skin produces less Vitamin D3 with age
- People with darker skin tones — melanin reduces Vitamin D3 synthesis
- Vegetarians and vegans — fewer dietary sources of Vitamin D2
- Patients with Crohn's disease, celiac disease or inflammatory bowel disease
- Obese individuals — Vitamin D is sequestered in fat tissue
- Pregnant and breastfeeding women
- Patients on long-term corticosteroids or anticonvulsant medications
When is a Vitamin D Test Recommended?
Your doctor may recommend a Vitamin D test if you experience:
- Persistent fatigue or unexplained tiredness
- Bone pain, back pain or frequent fractures
- Muscle weakness or cramps
- Depression or low mood
- Frequent infections or poor immunity
- Hair loss
- Slow wound healing
- As part of an annual health checkup especially for elderly patients or those with limited sun exposure
- Monitoring Vitamin D supplementation therapy
What Conditions Does Vitamin D Test Help Diagnose or Monitor?
- Vitamin D deficiency and insufficiency
- Osteoporosis and osteomalacia (softening of bones)
- Rickets in children
- Hypocalcemia (low blood calcium linked to Vitamin D deficiency)
- Hyperparathyroidism (secondary to low Vitamin D)
- Autoimmune conditions — Vitamin D plays a role in immune modulation
- Depression and seasonal affective disorder
- Monitoring supplementation in deficient patients
Vitamin D Test Price in Kolkata
Vitamin D (25-OH) Test Price: ₹1,750
No fasting required | Can be done any time of day | Free home collection above ₹2,000
No fasting required | Can be done any time of day | Free home collection above ₹2,000
Tests Commonly Ordered Alongside Vitamin D
- Serum Calcium — Vitamin D deficiency directly affects calcium levels in the blood
- PTH (Parathyroid Hormone) — elevated in secondary hyperparathyroidism caused by Vitamin D deficiency
- Serum Phosphorus — affected by Vitamin D and parathyroid hormone levels
- Vitamin B12 — frequently deficient alongside Vitamin D, especially in vegetarians
- CBC (Complete Blood Count) — to check for anemia alongside nutritional deficiencies
- Thyroid Profile (TSH) — thyroid disorders can cause similar fatigue symptoms
Home Collection for Vitamin D Test in Kolkata
Apollo Diagnostics provides home blood sample collection for Vitamin D tests across North and Central Kolkata. No fasting is required, so you can book any convenient time slot. Our phlebotomists arrive at your doorstep with sterile equipment and transport samples to our NABL-certified central laboratory using cold-chain protocols.
- Home collection available: 7:00 AM – 2:30 PM Daily
- No fasting required — book any time
- Free home collection on orders above ₹2,000
- Digital reports delivered to WhatsApp within 24 hours
Quick Links
→ Apollo Diagnostics Nagerbazar → Full List of Individual Tests → Book Home Collection → Full Body Checkup Packages
→ Apollo Diagnostics Nagerbazar → Full List of Individual Tests → Book Home Collection → Full Body Checkup Packages
Frequently Asked Questions
Q1. What is the Vitamin D test used for?
The Vitamin D (25-OH) test measures the level of Vitamin D in your blood. It is used to diagnose Vitamin D deficiency or insufficiency, investigate bone pain, fatigue and muscle weakness, monitor supplementation therapy and screen high-risk groups like the elderly, vegetarians and people with limited sun exposure.
Q2. What is the normal Vitamin D level?
A sufficient Vitamin D level is between 30–50 ng/mL. Optimal levels are above 50 ng/mL. Levels between 20–29 ng/mL are insufficient and supplementation is recommended. Below 20 ng/mL confirms deficiency and requires treatment. Below 10 ng/mL is severely deficient and needs urgent attention.
Q3. Does the Vitamin D test require fasting?
No. The Vitamin D test does not require fasting. You can eat and drink normally before the test and book a home collection at any convenient time of day. However inform your phlebotomist if you are taking high-dose Vitamin D supplements as this helps your doctor interpret the result accurately.
Q4. What is the Vitamin D test price at Apollo Diagnostics Kolkata?
The Vitamin D (25-OH) test price at Apollo Diagnostics is ₹1,750. No fasting is required. Home collection is available free on orders above ₹2,000.
Q5. Why is Vitamin D deficiency so common in Kolkata?
Despite Kolkata's sunny climate, Vitamin D deficiency is extremely common because most city residents spend the majority of the day indoors — at home, in offices, or in vehicles. Even when outdoors, sunscreen use, clothing coverage and air pollution reduce UV exposure. Additionally, very few foods naturally contain significant amounts of Vitamin D, making dietary sources insufficient for most people.
Q6. What are the symptoms of Vitamin D deficiency?
Common symptoms include persistent fatigue, bone pain especially in the back and legs, muscle weakness or cramps, frequent infections, depression or low mood, hair loss and slow wound healing. Many people with Vitamin D deficiency have no obvious symptoms initially — which is why routine testing is recommended for high-risk groups.
Q7. How is Vitamin D deficiency treated?
Treatment depends on the severity of deficiency. Mild insufficiency may be corrected with daily oral Vitamin D3 supplements (typically 1,000–2,000 IU per day) and increased sun exposure. Moderate to severe deficiency usually requires higher doses prescribed by a doctor — often weekly or monthly high-dose supplements or injections. Follow-up testing after 3 months confirms whether levels have normalised.
Q8. Is home collection available for Vitamin D test in Kolkata?
Yes. Apollo Diagnostics provides home blood sample collection for Vitamin D tests across Dum Dum, South Dum Dum, Nagerbazar, Satgachi, Baguiati, Lake Town, Bangur, Kaikhali, Sealdah, Entally, Phoolbagan, Tangra and surrounding areas. No fasting required. Book by calling or WhatsApping +91 8660434628.
Q9. How long does it take to get Vitamin D test results?
Vitamin D test results are typically available within 24 hours of sample collection. Reports are delivered digitally to your WhatsApp or email.
Q10. Which centre processes my Vitamin D sample in Kolkata?
All samples collected across North and Central Kolkata are processed at Apollo Diagnostics Nagerbazar — Nandarani Apartment, 8A Narasingha Avenue, Nagerbazar, Dum Dum, Kolkata 700074. Our lab is NABL-certified and ISO-certified.
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