Foundation of Practice — Practice
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Nephro-urology
Urea and electrolytes, 6-year-old with 3 days of vomiting and diarrhoea
| Result | Value | Reference range |
|---|---|---|
| Sodium | 128 mmol/L | 135-145 |
| Potassium | 5.8 mmol/L | 3.5-5.0 |
| Urea | 14.2 mmol/L | 2.5-6.5 |
| Creatinine | 88 µmol/L | 27-42 |
| Bicarbonate | 16 mmol/L | 22-29 |
A previously well 6-year-old presents with 3 days of vomiting and watery diarrhoea, reduced urine output, and lethargy. Capillary refill is 3 seconds. His blood results are shown above. Which of the following is the single most appropriate immediate management step?