[Control of diabetes mellitus with the insulin pen. Adequately managed?]

An insulin pen is often preferred to conventional injection material. It implies the use of 100 IU insulin/ml and the patient may not be aware of the change from 40 IU/ml. Moreover the handling of the insulin pen materials is not well known to home care workers called in when the patient is unable to help him/herself. General change over to insulin concentrations of 100 IU/ml is desirable.