Hypophosphataemia
Severity
Range
- MildPO₄ 0.6–0.8
- ModeratePO₄ 0.3–0.59
- SeverePO₄ < 0.3 or symptomatic
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Endocrine / metabolic Causes
Refeeding syndromeDKA recoveryHyperparathyroidismVitamin D deficiency
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Gastrointestinal Causes
Malabsorption (coeliac, short bowel)Chronic diarrhoea / vomitingPhosphate-binding antacids (aluminium, calcium, sevelamer)Alcoholism, malnutrition
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Renal Causes
Fanconi syndrome / RTAPost-renal transplantTubular dysfunction (tenofovir, ifosfamide)
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Cellular shift Causes
Insulin / glucose infusionRespiratory alkalosis (hyperventilation, sepsis)Catecholamine surge
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Drugs Causes
IV iron (ferric carboxymaltose)Tenofovir, imatinibDiuretics