Serum copeptin levels on admission were significantly higher in patients with moderate-to-severe hyponatraemia (median 18.5 pmol/L) as compared with normonatraemic patients (12.7 pmol/L) but not with malaria patients who presented with mild hyponatraemia (13.2 pmol/L, Figure 2). The gene discussed is AVP; the disease is Hyponatremia.