Treatment of Acute Hypocalcemia When Corrected Calcium Is Below 1.5 mmol/L or Symptomatic Presentation Is Present

Clinical Scenario

This protocol addresses acute hypocalcemia that has reached a threshold requiring immediate intervention — defined by severely depressed corrected serum calcium, a critically low ionised calcium, or the presence of symptoms signalling neuromuscular compromise.

Criteria for This Protocol

The protocol applies when any of the following are met: corrected serum calcium below 1.5 mmol/L, ionised calcium below 0.75 mmol/L, or active symptoms such as perioral or finger paraesthesia, seizures, tetany, or a positive Chvostek's or Trousseau's sign. Patients at high risk of becoming symptomatic — including those who are post-parathyroidectomy — are also included.

Corrected Ca < 1.5 mmol/L Ionised Ca < 0.75 mmol/L Seizures Tetany Paraesthesia Trousseau's sign Chvostek's sign Post-parathyroidectomy

Treatment Approach

At this severity, correction involves intravenous calcium gluconate — administered in a structured sequence of an initial bolus phase followed by a titrated continuous infusion. The complete dosing, timing, and monitoring parameters are contained in the full protocol.

Clinical Goal

Plasma calcium level is repeated 4 hours after commencing treatment to guide further management.

Instant Access to Structured Evidence-Based Regimens

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)
Severe or symptomatic hypocalcaemia (e.g. perioral/finger paraesthesia, seizures, tetany, positive Chvostek’s/Trousseau’s) or high risk of becoming symptomatic (e.g. post-parathyroidectomy)
Correct with intravenous calcium gluconate.
Repeat plasma calcium level 4 hours after commencing treatment.

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