Vitamin D (25-OH) in Hisar

What is the Vitamin D (25‑OH) test?

• Measures the level of 25‑hydroxyvitamin D in the blood, the main circulating form of vitamin D.
• Reflects overall vitamin D status from sun exposure, diet, and supplements.

Key parameter

Why it is done

• Routine screening in people at risk of deficiency (elderly, limited sun exposure, darker skin, malabsorption).
• Evaluation of bone health complaints (back pain, fractures, osteomalacia).
• Monitoring patients on vitamin D supplementation or chronic kidney disease.
• Assessing risk factors for autoimmune conditions, certain cancers, and cardiovascular disease.

Early detection

The test can help identify signs of vitamin D deficiency or excess, but it does not diagnose a disease on its own – a doctor interprets the result together with symptoms, history, and other tests.

What abnormal results may indicate

• Low levels may suggest deficiency, leading to bone pain, muscle weakness, increased fracture risk, and may be associated with autoimmune disorders.
• High levels may indicate excessive supplementation or certain rare conditions, potentially causing hypercalcemia, nausea, or kidney stones.
• Results can be influenced by hydration, recent sun exposure, diet, medications (e.g., anticonvulsants), and laboratory variation.

Who might be advised to get this test

• Adults over 65, pregnant women, nursing mothers, people with limited sun exposure, individuals with darker skin, those on long‑term steroids, patients with malabsorption syndromes, chronic kidney disease, or a history of fractures.

Summary

The 25‑OH vitamin D test measures your body’s vitamin D level, helping doctors assess bone health and guide supplementation.

• Fasting: No fasting required.
• If combined with fasting tests: Follow the longest fasting period required among the tests.
• Procedure: A healthcare professional draws a small amount of blood (usually 5–10 mL) from a vein in the arm using a needle. The process takes about 5 minutes.
• Discomfort: Mild pinch or sting from the needle; bruising may occur.
• Precautions: No special precautions needed. Avoid excessive alcohol or strenuous exercise 24 h before if you are also taking other tests that require it.
• Recommendation: Confirm specific preparation instructions with your doctor or the lab. This information is general educational content and not a substitute for professional medical advice.