Laboratory values at presentation in case 1
| Age (years) | 2 |
| Δ weight (g)* | +300 |
| Expected Δ weight (g) with dehydration† | −1103 |
| Plasma Na (mmol/L) | 165 |
| Creatinine (μmol/L) | 361 |
Urine values were unavailable, as the patient was anuric.
*The weight change is in comparison to a weight obtained 2 days prior.
†The change in weight expected with hypernatraemic dehydration was calculated according to formula 1: weight (12.3 kg)×total body water ratio (0.65)×(observed plasma Na (165) – upper limit of normal for plasma Na (145))/upper limit of normal for plasma Na (145).