Treatment of Acute Hypocalcemia with Corrected Serum Calcium 1.5–2.15 mmol/L (Not Severe or Symptomatic)

This protocol covers acute hypocalcaemia presenting in the mild-to-moderate range — corrected serum calcium 1.5–2.15 mmol/L — where the patient is not severely affected and has no significant symptoms.

Clinical Scenario

Mild–Moderate Hypocalcaemia

Corrected serum calcium falls between 1.5 and 2.15 mmol/L. This range encompasses mild hypocalcaemia (2.15–1.91 mmol/L corrected) and moderate hypocalcaemia (1.9–1.5 mmol/L corrected). The presentation is not severe (below 1.5 mmol/L corrected or below 0.75 mmol/L ionised) and the patient is not symptomatic, permitting an oral management approach.

Management Approach

The standard intervention for this scenario is oral calcium supplementation. The full protocol specifies the choice of preparation, the appropriate amount, and the timing of administration. Only part of the approach is outlined here — the complete regimen is available via the link below.

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References

5. HYPOcalcaemia (Mild: 2.15–1.91 mmol/L corrected, Moderate 1.9–1.5 mmol/L corrected, Severe: less than 1.5 mmol/L corrected or 0.75 mmol/L IONISED)

Mild to moderate hypocalcaemia

Treat with oral supplementation:

Effervescent calcium tablets 1 g (Calsource®) 1–2 tablets (25–50 mmol) daily OR

Calcium 600 mg (e.g. Caltrate) 1–2 tablets (15–30 mmol) daily. Give with food.

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