Electrolyte Supplementation

Patient Weight*

Phosphate (IV)

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Potassium phosphate adds potassium: count it toward the 0.5 mEq/kg/h potassium ceiling. Check the product label for its P and K content. Monitor phosphate every 6 to 12 h; priority electrolyte in re-feeding syndrome.

Magnesium (IV)

Default 4.06 mEq/mL (50% solution, 2.03 mmol/mL).

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1 mmol Mg = 2 mEq. Dilute MgSO4 50% to 20% or less before IV use. Monitor ECG, blood pressure and respiration during infusion.

Calcium Gluconate (IV)

Recorded in the plan; doses are weight based.

Default 9.3 mg/mL (10% gluconate).

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Give the acute dose SLOWLY over 10 to 20 min with ECG monitoring. Stop if bradycardia, QT shortening or arrhythmia develops. Do not mix with bicarbonate.

Sodium Bicarbonate

Enter BE as reported (negative in metabolic acidosis).

Enter weight and a negative base excess

Consider only if pH is below 7.1 to 7.2 after perfusion has been addressed. Give 1/3 to 1/2 of the calculated dose over 15 to 30 min, then recheck the blood gas. Flush the line before and after (incompatible with calcium).

This calculator is intended as a guide for use by veterinary professionals only. It is not a substitute for professional interpretation, diagnosis, or treatment. Calculations may not be accurate for all individuals or circumstances. Always use professional judgement and verify all calculations before use in clinical practice.