Calcium fulfills various functions like bone mineralization and transmission of nerve impulses. Decreased amounts occur e.g. in osteoporosis and kidney diseases; increased levels indicate hyperparathyroidism and malignant diseases.

Reference Ranges

Adults8.6 – 10.3 mg/dL2.15 – 2.57 mmol/L
Newborns, premature6.2-11.0 mg/dL1.55-2.75 mmol/L
Children < 10 d7.6-10.4 mg/dL1.90-2.60 mmol/L
Children 11 d-2 yr9.0-11.0 mg/dL2.25-2.75 mmol/L
Children 3-12 yr8.8-10.8 mg/dL2.20-2.70 mmol/L
Children 13-18 yr8.4-10.2 mg/dL2.10-2.55 mmol/L
Women< 250 mg/24h6.24 mmoL/24h
Men< 300 mg/24h7.49 mmoL/24h
Each laboratory should check if the reference ranges are transferable to its own patient population and determine own reference ranges if necessary. For diagnostic purposes, the results should always be assessed with the patient’s medical history, clinical examinations and other findings.

Increased in

  1. Hyperparathyroidism
  2. Myeloma
  3. Metastic carcinoma
  4. Sarcoidosis
  5. Thiazide therapy
  6. Thyrotoxicosis

Decreased in

  1. Hypoparathyroidism
  2. Hypoalbuminemia
  3. Chronic renal disease
  4. Acute pancreatitis
  5. Prolonged or severe Vitamin D deficiency (Rickets, Osteomalacia)
  6. Malnutrition
  7. Sprue steatorrhea


Use our conversion tool to quickly convert between conventional units and SI units



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