Basal rate
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In biology, basal rate is a rate of continuous supply of some chemical or process. In the case of diabetes mellitus, it is a low rate of continuous insulin supply needed for such purposes as controlling cellular glucose and amino acid uptake.
Together with a bolus of insulin, the basal insulin completes the total insulin needs of an insulin dependant person.
An insulin pump is one way to arrange for a closely controlled basal insulin rate. The slow-release insulins (e.g, Lantus and Levemir) can provide a similar effect.