Home → Tests → Calcium Test

Calcium Test

⚠️ Update approaching🔬 Evidence: ModerateInternal Medicine
Diğer adları: Ca, Calcium level, Ionized calcium
⚠️

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.

📚 Most Important Studies on This Topic

1

Evaluation and Management of Primary Hyperparathyroidism: Summary Statement and Guidelines from the Fifth International Workshop

Guideline· Journal of Bone and Mineral Research · 2022 · PMID: 36245251

2

Diagnosis and management of hypocalcaemia

Review· BMJ · 2008 · PMID: 18535072

3

Primary hyperparathyroidism

Review· Nature Reviews Endocrinology · 2018 · PMID: 28885621

✅ 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.

📋 References

[PMID: 36245251] Evaluation and Management of Primary Hyperparathyroidism: Summary Statement and Guidelines from the Fifth International Workshop. Journal of Bone and Mineral Research, 2022.
[PMID: 28885621] Primary hyperparathyroidism. Nature Reviews Endocrinology, 2018.
[PMID: 30675420] KDIGO 2017 Clinical Practice Guideline Update for the Diagnosis, Evaluation, Prevention, and Treatment of Chronic Kidney Disease-Mineral and Bone Disorder (CKD-MBD). Kidney International Supplements, 2017.
[PMID: 18535072] Diagnosis and management of hypocalcaemia. BMJ, 2008.
Last reviewed: 4/1/2026
Next review: 4/1/2027

🔗 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.