Barrier Functions oF Skin in ICU: SKIN-BAR

Inclusion Criteria: * Adults aged \>18 years * Admission to the intensive care unit * Initial skin assessment completed within the first 4 hours after ICU admission * Hemodynamically stable enough to undergo follow-up and repeated skin measurements * Intact skin integrity at ICU admission * Willingness to participate in the study, with informed consent provided by the participant or legally authorized representative Exclusion Criteria: * Inability to tolerate position changes * Post-cardiopulmonary resuscitation care period at enrollment * Cardiac arrest or cardiopulmonary resuscitation during follow-up * Severe edema or subcutaneous fluid accumulation * Presence of skin lesions before ICU admission * Systemic dermatologic disease directly affecting skin barrier function