Based on Mrs. Smith's total amount of fluid to be removed, what is the ultrafiltration rate per hour (mL/hr) for her 4-hour treatment?

• A. 1,000 mL/hr
• B. 1,385 mL/hr
• C. 1,540 mL/hr
• D. 2,000 mL/hr

Answer: (B)

The ultrafiltration rate is the amount of fluid removed per hour, so you divide the total fluid to be removed by the treatment time.

If the total fluid to remove is 5,540 mL over 4 hours, the rate is 5,540 ÷ 4 = 1,385 mL per hour.

This rate must be checked against the patient’s tolerance; removing fluid this quickly can increase the risk of intradialytic hypotension, cramps, or other hemodynamic issues, so monitor closely and adjust as needed.