Calcium Administration Guidelines

Emergency/Acute IV Administration

The American Academy of Pediatrics recommends administering calcium chloride 20 mg/kg IV/IO (0.2 mL/kg of 10% solution) for hypocalcemia, hyperkalemia, hypermagnesemia, or calcium channel blocker toxicity 1, 2
Calcium chloride should be given by slow push during cardiac arrest; infuse over 30-60 minutes for other indications 1
Calcium chloride is preferred over calcium gluconate in critically ill children because it results in more rapid increases in ionized calcium concentration 1, 2
Administer through a central venous catheter when possible; extravasation through peripheral IV can cause severe skin and soft tissue injury 1, 2
Substitute calcium gluconate 60 mg/kg IV if calcium chloride is unavailable 1, 2
Monitor ECG continuously during administration; stop if symptomatic bradycardia occurs 1, 3
Never mix calcium with sodium bicarbonate or administer through the same line 1, 2
Use caution in hypocalcemia with elevated phosphate; increased calcium may precipitate calcium phosphate in tissues and cause obstructive uropathy 3

For patients with gastroesophageal reflux disease (GERD) or those taking proton pump inhibitors, prescribe calcium citrate as it does not require gastric acid for absorption and causes less gastrointestinal irritation 4
Calcium carbonate provides 40% elemental calcium but requires gastric acid and must be taken with meals 5, 4
Calcium citrate provides 21% elemental calcium but absorption is independent of meals and gastric acidity 5, 4
Divide total daily dose into increments of ≤500-600 mg elemental calcium per administration to maximize absorption 5, 6, 4
Space calcium and iron supplements 2 hours apart as calcium inhibits iron absorption 6
For pregnancy, administer 1.5-2.0 g elemental calcium daily in divided doses for preeclampsia prevention 5
After bariatric surgery (RYGB/sleeve gastrectomy), ensure adequate calcium intake with consideration for combined vitamin D and calcium supplementation if PTH is elevated 6

Never administer calcium during symptomatic hyperphosphatemia without addressing phosphate levels first; risk of tissue calcification 3
Avoid total daily calcium intake exceeding 2,000-2,500 mg due to increased risk of kidney stones and potential cardiovascular events 4
Do not give calcium bicarbonate for hypocalcemia in tumor lysis syndrome if phosphate is elevated; consult nephrology 3
Verify hyperkalemia with second sample before treating with calcium to rule out factitious elevation from hemolysis 3