Moderate-to-Severe Hypercalcemia When IV Rehydration Has Not Achieved the Urine Output Target

This protocol covers patients with corrected serum calcium at or above 3.0 mmol/L (moderate to severe), or symptomatic hypercalcaemia presenting with lethargy, coma, or ECG changes (shortened QT interval), where initial intravenous rehydration has fallen short of the required urine output goal.

Clinical Scenario

Corrected serum calcium 3.0 mmol/L or above (moderate to severe), or symptomatic hypercalcaemia characterised by lethargy, coma, or a shortened QT interval on ECG.

Prior Treatment — Insufficient Response

Rehydration with intravenous sodium chloride 0.9% was the first-line intervention, targeting a urine output greater than 60 mL/hr. This protocol applies when that urine output target has not been met.

Next-Step Approach

When rehydration alone is insufficient, bisphosphonate therapy becomes indicated — the specific agent, selection criteria, and full regimen are detailed in the structured protocol.

Instant Access to Structured Evidence-Based Regimens

References

HYPERcalcaemia (Mild: 2.55–2.9 mmol/L, Moderate: 3.0–3.2 mmol/L, Severe: more than 3.2 mmol/L corrected)
Moderate to severe or symptomatic hypercalcaemia (e.g. lethargy, coma, ECG changes [shortened QT interval])
Bisphosphonate therapy with either zoledronic acid or pamidronate may be indicated.

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