Validation of the GIDS and Description of Phosphate Disorders

Patient population All consecutive adult patients that are admitted to participating ICU during a recruitment period of maximum 8 weeks.

Duration of the study for the individual patient:

• Study period of a maximum of 7 days
• Follow-up period of a maximum of 90 days All patients will be included in the Part A of the study validating GIDS, patients from sites with routine serum phosphate measurements will be included also in the Part B of the study where additional data on serum phosphate levels and management of phosphate disorders will be collected. There will be no additional measurements due to study participation, daily routine is documented.

Baseline characteristics will be collected at ICU admission/study inclusion Daily data include routine data on organ dysfunctions and organ support therapies and specific data on phosphate where available.

Outcome data include 28 and 90 days mortality, and days free of organ support by day 28.

Inclusion criteria

• Admission to ICU during the study period
• Age ≥18 years

Exclusion criteria

• Age <18 years;
• Patients with restrictions of care such as "no intubation" or "no renal replacement therapy" on ICU admission and patients admitted for treatment as organ donors;
• Continuous chronic home ventilation for neuromuscular disease;
• Declined participation or informed consent (if the local ethics committee requests the latter for this non-interventional study);
• Readmission to ICU during the study period