To evaluate the effect of using a mathematical model developed through pre- and post-surgical hemoglobins to predict the volume to aspirate in patients undergoing primary body liposuction.

Postoperative anemia is a significant risk associated with liposuction, yet the scientific literature lacks detailed data on blood loss relative to the volume of fat removed. To address this, the investigators aimed to develop a mathematical formula predicting the decrease in postoperative hemoglobin (Hb post) based on preoperative hemoglobin (Hb pre), Body Mass Index (BMI), and the volume of fat suctioned. An observational, analytical, non-experimental, prospective study was conducted on liposuction patients to validate this predictive formula. Statistical analysis using Spearman's test showed that the results were statistically significant (P < 0.05).

Inclusion Criteria:

• Patients of indistinct gender, operated on at the Centro Médico Nacional de Occidente for primary liposuction.
• Age between 18 to 60 years old
• Liposuction technique used: Super wet or Tumescent.
• Surgical procedure on any area of the body
• Large volume liposuction (> 5 L)
• Use of regional anesthesia

Exclusion Criteria:

• Presence of any of the following comorbidities: Systemic Arterial Hypertension or Diabetes Mellitus type 2.
• Performance of 2 or more procedures
• Use of medications (NSAIDs and/or coadjuvants that modify coagulation times).

Patients undergoing the first-time liposuction procedure, operated in the Plastic and Reconstructive Surgery Service