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Calcium Test

✅ Up to date🔬 Evidence: ModerateInternal Medicine
Diğer adları: Ca, Calcium level, Ionized calcium
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Discuss your test results with your doctor. This page is for informational purposes only and does not provide a diagnosis.

⚡ Key Facts

• Calcium is essential for bone health, muscle contraction, and nerve function • Total calcium normal: 8.5–10.5 mg/dL (2.12–2.62 mmol/L) • Must be corrected for albumin level for accurate interpretation • Ionized calcium is the biologically active fraction

🧪 What Does This Test Measure?

The calcium test measures total calcium in the blood, a mineral essential for bone health, muscle contraction, nerve function, and blood clotting.

📋 Why Is It Ordered?

Ordered for bone disease evaluation, kidney disease monitoring, parathyroid disorder investigation, and pre/post-surgical assessment.

🔧 Preparation

No special preparation is generally required. Some laboratories recommend morning fasting collection.

📊 Reference Ranges

Total calcium normal: 8.5–10.5 mg/dL (2.12–2.62 mmol/L) Ionized calcium normal: 4.5–5.6 mg/dL (1.12–1.40 mmol/L) ⚠️ Correct for albumin when total calcium is used.

⬆️ High Values

High calcium (hypercalcemia) is most commonly associated with overactive parathyroid glands or certain malignancies.

⬇️ Low Values

Low calcium (hypocalcemia) is most commonly associated with vitamin D deficiency, low albumin, or underactive parathyroid glands.

⚙️ What Can Affect Results?

Albumin level, vitamin D status, medications, kidney function, and blood collection technique may affect calcium results.

🔬 Evidence Summary

Moderate evidence: 2 guidelines and 2 comprehensive reviews.

✅ Key Takeaways

💡

What you learned: Calcium is vital for bones, muscles, and nerves. Total calcium should be corrected for albumin; ionized calcium is the most accurate measure.

⛔

A calcium result alone cannot diagnose parathyroid or bone disease. Albumin, vitamin D, PTH, and clinical context are needed.

🔬 Sources Used on This Page

4 sources · Most recent publication: 2022
📋
Guideline
Expert society and guideline recommendations
2
sources
📖
Review
Comprehensive topic evaluation
2
sources
Overall assessment: Evidence level for this topic is moderate. This page is supported by 2 guidelines, 2 reviews.

📝 Questions to Ask Your Doctor

Be prepared for your appointment. Add questions to your list.

Last reviewed: 4/1/2026
Next review: 7/1/2026

🔗 Related Topics

🧪 Fosfor (P)🧪 Vitamin D🧪 Magnezyum (Mg)🧪 eGFR
⚖️ This page does not replace medical advice. Make treatment decisions with your doctor.
Content is based on scientific studies indexed in PubMed and current clinical guidelines.