Monitor and correct phosphate in refeeding syndrome. Target serum phosphate above 0.8 mmol/L during refeeding. If phosphate drops to 0.5-0.8 mmol/L, use oral sodium phosphate supplementation and slow caloric advancement. If phosphate falls below 0.5 mmol/L (severe hypophosphatemia), use IV phosphate replacement and caloric restriction until above 0.8 mmol/L.
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