Heat distribution unit. The Heat Distribution Unit (HDU), also known as a Heat Interface Unit (HIU), provides domestic hot water (DHW) and space heating to properties that are serviced from district heating or centralised boiler plants.
Called hypoglycemia, this deficiency of glucose in the blood is considered critical at, or below, 40 milligrams of glucose per deciliter of blood, or 40 mg/dL. However, this figure must be adjusted individually, as the exact level at which an a person develops symptoms varies.
Blood glucose levels that are not in the critical range are not necessarily healthy ones. The American Diabetes Association has established ideal glucose levels: For non-diabetics, the range is 70 to 99 mg/dL fasting, and 70 to 140 mg/dL.