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Kidney Function

What is Calcium? Your Complete Guide

Calcium is essential for bones, muscles, nerves, and heart function. Your blood calcium level is tightly regulated by parathyroid hormone and vitamin D.

💡Simply Explained

Calcium is like the construction material for your bones and teeth. But it does much more — it helps your muscles contract, your nerves send signals, and your heart beat regularly. Your body guards its blood calcium level very carefully.

📏Normal Range

8.5 – 10.5mg/dL

Typical reference range. Your lab may use slightly different values.

LowNormalHigh
< 8.5 mg/dL8.5 – 10.5 mg/dL> 10.5 mg/dL

⬆️What High Calcium Means

Possible Causes

  • Hyperparathyroidism (overactive parathyroid glands)
  • Cancer
  • Excessive vitamin D supplementation (common self-medication in India)
  • Dehydration
  • Thiazide diuretics

Foods That Can Help

  • Reduce calcium-rich supplements if taking any
  • Reduce vitamin D supplements if taking mega-doses
  • Stay hydrated

⬇️What Low Calcium Means

Possible Causes

  • Vitamin D deficiency (extremely common in India)
  • Hypoparathyroidism
  • Chronic kidney disease
  • Low albumin (makes total calcium look falsely low)
  • Malabsorption

Foods That Can Help

  • Milk, curd, paneer, cheese daily
  • Ragi (finger millet) — highest calcium among grains
  • Sesame seeds (til) and almonds
  • Dark leafy greens: amaranth, drumstick leaves
  • Calcium-fortified foods

🏃Lifestyle Actions

If Your Calcium Is High

  • Check if you're taking excessive vitamin D or calcium supplements
  • Get parathyroid hormone (PTH) level tested
  • Stay well hydrated
  • If persistent, see a doctor for investigation

If Your Calcium Is Low

  • Get vitamin D levels checked — vitamin D is needed to absorb calcium
  • Start vitamin D supplementation if deficient (extremely common in India)
  • Include calcium-rich foods in every meal
  • Supplement calcium only if dietary intake is insufficient

🩺When to See a Doctor

High Calcium

Mildly high calcium needs investigation but isn't urgent. Very high calcium (>12 mg/dL) with confusion, nausea, or excessive thirst — see a doctor within 1-2 days.

Low Calcium

Mildly low calcium — start vitamin D and calcium-rich foods. Very low calcium with muscle cramps, tingling, or spasms — see a doctor within a few days.

🎯Did You Know?

Ragi (finger millet), a common Indian grain, contains 3 times more calcium than milk per 100 grams! It's one of the richest plant sources of calcium in the world.

❓Frequently Asked Questions

What is Calcium?

Calcium is like the construction material for your bones and teeth. But it does much more — it helps your muscles contract, your nerves send signals, and your heart beat regularly. Your body guards its blood calcium level very carefully.

What is the normal range for Calcium?

The typical normal range for Calcium is 8.5–10.5 mg/dL.

What causes high Calcium?

Hyperparathyroidism (overactive parathyroid glands). Cancer. Excessive vitamin D supplementation (common self-medication in India).

What causes low Calcium?

Vitamin D deficiency (extremely common in India). Hypoparathyroidism. Chronic kidney disease.

How can I check my Calcium levels?

You can check your Calcium levels with a routine blood test. Upload your lab report to ScanHealth for an instant, plain-language explanation.

Check Your Calcium Results Instantly

Upload your blood test report and get a plain-language explanation of your Calcium result — plus all other markers. Free.

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This guide is for informational purposes only and does not constitute medical advice. Reference ranges may vary by lab. Always consult a qualified healthcare provider for diagnosis and treatment.