IBCC Episode 36 - All things Phosphate

Phosphorus management in critical care centers on the clinical nuances of hypophosphatemia and hyperphosphatemia. Hypophosphatemia often correlates with poor outcomes, yet evidence remains inconclusive regarding whether supplementation improves patient status or simply normalizes serum levels. Because 99% of phosphorus resides intracellularly, serum measurements frequently fail to reflect true total body stores, particularly in patients with refeeding syndrome or diabetic ketoacidosis. Clinicians must prioritize renal function and calcium levels when treating these imbalances, as aggressive correction risks severe complications like calciphylaxis or symptomatic hypocalcemia. Hyperphosphatemia, though less frequent, typically arises from renal failure combined with tissue necrosis, necessitating strategies like volume resuscitation and forced diuresis. Ultimately, electrolyte abnormalities often present in clusters, requiring a comprehensive diagnostic approach rather than isolated laboratory correction.