Treatment of Acute Hypocalcemia with Serum Calcium Below 1.9 mmol/L or Symptomatic Presentation
Clinical Scenario
This protocol applies to patients presenting with severe hypocalcemia: a serum calcium below 1.9 mmol/L, or any patient symptomatic at any level below the reference range. Both thresholds independently trigger the same urgent management pathway.
Defining the Population
Severe hypocalcaemia is defined as serum calcium <1.9 mmol/L and/or symptomatic at any level below reference range. Symptomatic status — regardless of the absolute calcium value — is sufficient to indicate this acute presentation.
Treatment Approach (Partial Overview)
The acute phase involves intravenous calcium replacement administered under ECG monitoring, followed by a continuous infusion titrated toward normocalcaemia. Treatment of the underlying cause — which may include hypoparathyroidism, vitamin D deficiency, or hypomagnesaemia — forms an essential part of the regimen…
Complete dosing, infusion rates, titration algorithm, and sequencing are in the full protocol.
Treatment Goals
- Achieve normocalcaemia
- Render the patient asymptomatic
- Where hypomagnesaemia is implicated: achieve normal serum magnesium level
References
DOI: 10.1530/EC-16-0056
- Severe hypocalcaemia: serum calcium <1.9 mmol/L and/or symptomatic at any level below reference range.
- Administer i.v. calcium gluconate.
- Titrate the rate of infusion to achieve normocalcaemia and continue until treatment of the underlying cause has taken effect.
- This can be repeated until the patient is asymptomatic.
- Monitor serum Mg² and aim to achieve normal serum magnesium level.
- Treat the underlying cause; in post-operative hypocalcaemia and other cases of hypoparathyroidism, this consists of alfacalcidol or calcitriol therapy.
- Vitamin D deficiency or hypomagnesaemia should be treated as described above.
View source ↗