Inclusion Criteria:  Patients aged between 18 and 65 years, of any ethnic origin, with any type of comorbidities, with surgical indication in the Plastic, Maxillofacial and Obstetrics Surgery services scheduled or emergency under any mode of anesthesia (spinal, epidural, spinal combined or general anesthesia), following the usual practice of the service. That you agree to participate in the study by signing the informed consent.  Exclusion Criteria:  Children under 18 or over 65 years of age, having received active prewarming in the preoperative period, received anti-fibrinolytic treatment, with bleeding diathesis, untreated perioperative anemia, preoperative perinatal infections and / or requiring intraoperative blood transfusion. Patients who for any reason should not be included in the study according to the evaluation of the research team and / or who refuse to participate in the study.