Intraoperative Blood Loss Estimation

Estimates surgical blood loss: weighing sponges (1 g ≈ 1 mL blood), canister volume minus irrigation, visual estimation by procedure type. Typical blood loss: appendectomy 50–100 mL, cholecystectomy 100–200 mL, bowel resection 200–500 mL, hip replacement 200–500 mL, Whipple 500–1500 mL.

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Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How to Use

Enter the values for the scenario you are assessing. Estimates surgical blood loss: weighing sponges (1 g ≈ 1 mL blood), canister volume minus irrigation, visual estimation by procedure type. Typical blood loss: appendectomy 50–100 mL, cholecystectomy 100–200 mL, bowel resection 200–500 mL, hip replacement 200–500 mL, Whipple 500–1500 mL. Use the surgical blood loss result to inform your calculation.

Frequently Asked Questions