In newborns a level below 2.2 mmol/L (40 mg/dL) or less than 3.3 mmol/L (60 mg/dL) if symptoms are present indicates hypoglycemia.
Children's blood sugar levels are often slightly lower than adults'. Overnight fasting glucose levels are below 3.9 mmol/L (70 mg/dL) in 5% of healthy adults, but up to 5% of children can be below 3.3 mmol/L (60 mg/dL) in the morning fasting state.
This can be administered immediately after the potassium level is known to be higher than 3.3 mmol/l; if the level is any lower, administering insulin could lead to a dangerously low potassium level (see below).
Therefore, continuous observation of the heart rate is recommended, as well as repeated measurement of the potassium levels and addition of potassium to the intravenous fluids once levels fall below 5.3 mmol/l. If potassium levels fall below 3.3 mmol/l, insulin administration may need to be interrupted to allow correction of the hypokalemia.