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Diagnostic criteria for RFS severity [33]
| Severity of RFS | Mild | Moderate | Severe |
|---|---|---|---|
| Serum electrolytes* | 10–20% less | 20–30% less | > 30% less and/or organ dysfunction** |
| Timing | From hours up to 5 days after increasing the energy provision in an individual at risk | ||
*Decrease in any (one or more) of electrolyte serum levels, among phosphate, potassium, and/or magnesium
**Resulting from the decrease in any electrolyte and/or from thiamine deficiency
