Blood loss during major surgery is best estimated by:: (A) Visual assessment, (B) Suction bottles, (C) Transesophageal USG Doppler, (D) Cardiac output by thermodilution
Answer is B. Measurement of blood loss during surgery (Gravimetric Method)

Blood loss during operation is measured by: Weighing the swabs after use and subtracting the dry weight and fluid used + volume of blood collected in suction bottles (after subtracting irrigating fluid)