Dialysis Efficiency (Kt/V) Calculator

Dialysis Efficiency (Kt/V) Calculator

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If you are on dialysis, is it working for you? You should begin to feel better when your blood is getting adequately cleaned. Use this calculator to check if your dialysis session was efficient. Kt/V and Urea Reduction Ratio (URR) are two parameters used to measure the adequacy of dialysis, and consequently dialysis dose. Kt/V indicates the amount of blood cleared of urea and Urea Reduction Ratio is the percentage of urea cleared from your body.

Ideally Kt/V must be greater than 1.2 and URR must be above 65%
Enter the details
Pre-dialysis BUN
(BUN = Blood Urea Nitrogen)
Post-dialysis BUN
(BUN = Blood Urea Nitrogen)
(measured 2 to 5 minutes after the end of dialysis)
Dialysis time
Ultrafiltration Volume
Postdialysis Weight
* All fields are mandatory.

What is Kt/V?

Like any other medication or treatment, dialysis also has to be tailored to meet the requirements of the patient. The parameter that helps the doctors find out if the dialysis you are receiving is adequate is Kt/V. It is the ratio of urea clearance (K) multiplied by dialysis time (t) to the volume of water in your body. Kt/V values can be improved by either increasing blood flow rate through the dialyser, which increases urea clearance, or by increasing the duration of dialysis sessions.

Additional Information

It is important to ensure that your dialysis sessions are consistently efficient. You may not immediately feel the harmful effects of waste materials building up in your body, but some symptoms can help you figure out if you are receiving inadequate dialysis.

Watch out for:


There are some simple methods to ensure that you get adequate dialysis.
  • Be on time for your dialysis sessions
  • Make sure you stay till the end of the treatment session
  • Don't settle for lesser treatment time in case the staff wants to leave
  • Ensure you make up for time lost during bathroom trips or machine breakdowns
  • If you feel uneasy or restless towards the end don't hesitate to ask for help
  • Take note of how many times a dialyser is being reused and note down when you get a new dialyser.
  • Ensure that a new dialyser is rinsed well with saline before use
  • Try to get a new dialyser if you feel a reused one is not working for you
  • Strictly follow the fluid intake limits between sessions

What is Kt/V?

Like any other medication or treatment, dialysis also has to be tailored to meet the requirements of the patient. The parameter that helps the doctors find out if the dialysis you are receiving is adequate is Kt/V. It is the ratio of urea clearance (K) multiplied by dialysis time (t) to the volume of water in your body. Kt/V values can be improved by either increasing blood flow rate through the dialyser, which increases urea clearance, or by increasing the duration of dialysis sessions.

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Goldsboropiper Thursday, February 9, 2017

My wife is on PD. Normally her KT/V is in the range of 2.5-2.9 but her last Adequacy test results were .95. Is it normal for a patient to occasionally not have a good reading? Is this something to worry about? We haven't changed her routine.

surendar Wednesday, April 3, 2013

Dear, kschen. The calculator has been updated. Please try and provide your feedback. This calculator uses updated Daugirdas Formula to calculate KT/V. So you don't need to key in your pre-dialysis weight. Your ultra-filtration volume gives that. This formula is widely used to calculate kt/v. I request you to key in correct values. The result will be pretty close to what's shown in the dialysis machine.

kschen Monday, February 7, 2011

U only asked for the postdialysis weight.How about the predialysis weight?.Is it not important? What has Ultrafiltration got to do with the calculation? The result as shown is way out compared with the result as shown by the Dialysis machine.Thank you

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