Kt/V Calculator Daugirdas
Calculate dialysis adequacy using the Daugirdas Kt/V equation
Calculate Kt/V
Blood urea nitrogen before dialysis
Blood urea nitrogen after dialysis
Duration in hours (typically 3-4 hours)
Fluid removed during dialysis
Patient weight after dialysis session
Target Values
Hemodialysis
Kt/V ≥ 1.2 (minimum)
Kt/V ≥ 1.4 (target)
URR ≥ 65%
Peritoneal Dialysis
Weekly Kt/V ≥ 1.7
Acute Kidney Injury
Weekly Kt/V ≥ 3.9
Typical BUN Values
Pre-dialysis BUN
40-100 mg/dL
14-36 mmol/L
Post-dialysis BUN
15-40 mg/dL
5-14 mmol/L
Normal BUN
6-24 mg/dL
2.1-8.5 mmol/L
Kt/V vs URR
Kt/V Advantages
- • Accounts for ultrafiltration
- • Considers urea generation
- • More comprehensive measure
- • KDOQI recommended
URR Benefits
- • Simple calculation
- • Easy to understand
- • Quick assessment
- • Widely used
Understanding Kt/V in Dialysis
What does Kt/V mean?
Kt/V is a dimensionless number that measures dialysis adequacy. It represents the ratio of urea clearance (K) multiplied by time (t) to the patient's total body water volume (V). This metric indicates how effectively the dialysis treatment removes waste products.
Components of Kt/V
- •K: Dialyzer clearance (blood passage through filter)
- •t: Duration of dialysis session
- •V: Volume of total body water
Daugirdas vs Simple Kt/V
Daugirdas Formula
More accurate calculation that accounts for:
- • Ultrafiltration effects
- • Urea generation during dialysis
- • Rebound effects
Simple Kt/V
Basic calculation: -ln(Post BUN/Pre BUN)
Easier to calculate but less comprehensive
Optimal Kt/V (≥1.4)
- • Excellent patient outcomes
- • Reduced mortality risk
- • Better quality of life
- • Fewer complications
Adequate Kt/V (1.2-1.4)
- • Meets minimum standards
- • Acceptable outcomes
- • Consider optimization
- • Monitor closely
Inadequate Kt/V (<1.2)
- • Increased mortality risk
- • Poor quality of life
- • More complications
- • Urgent optimization needed
Improving Kt/V
Increase Treatment Time
- • Extend dialysis sessions
- • More frequent dialysis
- • Home dialysis options
Optimize Parameters
- • Increase blood flow rate
- • Use larger dialyzer
- • Improve vascular access
⚠️ Important Medical Disclaimer
This calculator is for educational purposes only and should not replace professional medical supervision.
- • Kt/V targets may vary based on individual patient factors and clinical guidelines
- • Always consult with a qualified nephrologist for dialysis prescription optimization
- • Regular monitoring and adjustment of dialysis parameters are essential
- • Consider other adequacy measures and patient-specific factors
- • Results should be interpreted within the full clinical context