A 3 day old baby boy is noted to have ambiguous genitalia at his postnatal check.
Investigations:
- Sodium 125 mmol/L (133-146)
- Potassium 5.2 mmol/L (3.4–6.0)
- Urea 5.0 mmol/L (0.8-5.5)
- Creatinine 70 micromol/L (21–75)/li>
- Bicarbonate 22 mmol/L. (22-29)
What is the most likely diagnosis:
- Acute renal failure
- Congenital adrenal hyperplasia
- Diabetes insipidus
- Hyponatraemic dehydration
- Renal tubular acidosis