Reset Osmostat: A Challenging Case of Hyponatremia

Table 1

Blood test results.

Hb	13.2 g/dL (13–18)	TSH	3.2 mU/L (0.35–5.50)
WBC	6.4 × 10^9/L (4–11)	T4	13 pmol/L (10.5–20)
Plt	457 × 10^9/L (150–500)	9 am cortisol	487 nmol/L (180–620)
Na	128 mmol/L (134–145)	LFTs	Normal
K	4.2 mmol/L (3.5–5)	Ca (total)	2.5 mmol/L (2.12–2.65)
Ur	6.7 mmol/L (2.5–6.7)	Phosphate	0.9 mmol/L (0.8–1.45)
Cr	88 mmol/L (70–150)