INS and periodic paralysis: Alternatively, a glucose provocation test, which aims to decrease serum potassium levels to below 3 mmol/l by oral administration of 2 g glucose/kg body weight and 10–20 IU insulin subcutaneously or i.v. administration of 1.5–3 g glucose/kg body weight and insulin over a period of 60 min, can confirm the diagnosis of hypokalemic periodic paralysis.