This is a prospective monocenter, non-randomised, open-lable single-group intervention diagnostic trial on the accuracy, reliability and feasibility of the continuous glucose monitoring system in critically systemic lupus erythematosus (SLE). Newly developed technologies for continuous glucose monitoring in critically SLE patients may improve glycemic control and reduce glucose variability. Critically SLE patients will be performed by continuous glucose monitoring. The subcutaneous glucose will be continuously monitored in critical SLE patients by freestyle libre glucose monitoring system for 14 days. The aim of this study is to evaluate accuracy feasibility and acceptance of these methods. To analyze accuracy sensor glucose levels will be validated due to venous blood measurements with glucose oxidase methods. The influence of several factors like oedema, perspiration, BMI, body temperature, pH-value application of vasoconstrictors on accuracy and feasibility of the particular system would be evaluated. Furthermore the acceptance of physicians and Nursing staff would be evaluated by a questionnaire.

Inclusion Criteria:

• Systemic lupus erythematosus (SLE), as defined by meeting at least 4 of 11 classification criteria of American College of Rheumatology for the classification of systemic lupus erythematosus, either sequentially or coincidentally. The 4 criteria doesn't need to be present at the time of study enrollment;
• critically SLE patients
• informed consent by the patients or legal proxy

Exclusion Criteria:

• age < 18
• no informed consent by the patients or legal proxy
• pregnancy
• infaust prognosis