ALB and susceptibility to pneumonia measurement: Patients admitted to a medical or general surgical ICU due to infection (e.g., pneumonia or sepsis) or after surgery (e.g., oncological surgery) are more likely suffering from greater systemic inflammation expressed in a higher serum urea, and lower albumin, level and hence, a higher serum urea-to-albumin ratio than ICU-admitted neurosurgical ICH patients, in which loss of consciousness is the main indication for admission.