Introduction
Kt/V is the standard measure of dialysis adequacy, expressing how many times the patient's total body water has been effectively cleared of urea during a session.
How to use the Dialysis Dose (Kt/V) Calculator
- Enter the dialyzer urea clearance K in mL/min.
- Enter the session duration t in minutes.
- Enter the estimated volume of distribution (urea) V in mL.
- Click Calculate to see the Kt/V and whether it meets target.
Formula and Calculation Method
Kt/V = (Clearance K × Time t) ÷ Volume of distribution V
Visual breakdown
REFERENCE
Target single-pool Kt/V ≥ 1.2 per haemodialysis session
Why use this calculator
A Kt/V below target signals under-dialysis and higher risk of complications. This tool computes the ratio instantly and shows how extending or shortening session time would move the number relative to the 1.2 target.
FAQs
What Kt/V is considered adequate?
A single-pool Kt/V of at least 1.2 per session is a commonly cited minimum target for haemodialysis.
How is V typically estimated?
V is usually estimated from anthropometric formulas (e.g. Watson formula) based on age, weight, height and sex.
Is single-pool Kt/V the same as equilibrated Kt/V?
No — equilibrated Kt/V accounts for post-dialysis urea rebound and is typically slightly lower than single-pool Kt/V.