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Hemodialysis - Kt/V and URR
Dialyzer Urea
Clearance (K):
L/min Dialysis Time (t):
Height: Weight:
Age: years Gender:
Target Kt/V: Diabetes?
Urea Volume Distrib (V)
:
liters
Kt/V:
 
Pre-dialysis BUN: mg/dL
Post-dialysis BUN: mg/dL
Post-dialysis Weight:
Ultrafiltrate Removed: liters
Urea Reduction Ratio: %
Kt/V:

Watson: Male TBW = 2.447 - (0.09156 x age) + (0.1074 x height) + (0.3362 x weight)
Female TBW = -2.097 + (0.1069 x height) + (0.2466 x weight)
Hume-Weyers: Male TBW = (0.194786 x height) + (0.296785 x weight) - 14.012934
Female TBW = (0.34454 x height) + (0.183809 x weight) - 35.270121
Chertow's Bioelectrical Impedance: TBW = ht x (0.0186104 x wt + 0.12703384) + wt x (0.11262857 x male + 0.00104135 x age - 0.00067247 x wt - 0.04012056) - age x (0.03486146 x male + 0.07493713) - male x 1.01767992 + diabetes x 0.57894981
Mellits-Cheek (kids): Boys TBW =
=
-1.927 + 0.465 x weight + 0.045 x height, for height < 132.7 cm
-21.993 + 0.406 x weight + 0.209 x height, for height > 132.7 cm
Girls TBW =
=
0.076 + 0.507 x weight + 0.013 x height, for height < 110.8 cm
-10.313 + 0.252 x weight + 0.154 x height, for height > 110.8 cm
Urea Reduction Ratio: URR =
(1 -
post-BUN ) x 100

pre-BUN
Daugirdas: Kt/V =
-ln( post-BUN  - 0.03) + (4 - 3.5 x  post-BUN ) x  UF



pre-BUN pre-BUN weight
Hume R, Weyers E. Relationship between total body water and surface area in normal and obese subjects. J Clin Pathol 24:234-238, 1971.
Watson PE, Watson ID, Batt RD. Total body water volumes for adult males and females estimated from simple anthropometric measurements. Am J Clin Nutr 33:27-39, 1980.
Chertow GM, Lowrie EG, Lew NL, Lazarus JM. Development of a population-specific regression equation to estimate total body water in hemodialysis patients. Kid Int 51:1578-1582, 1997.
Daugirdas JT. Second generation logarithmic estimates of single-pool variable volume Kt/V: an analysis of error. J Am Soc Nephrol 4:1205-1213, 1993.

DISCLAIMER
DISCLAIMER: All calculations must be confirmed before use. The authors make no claims of the accuracy of the information contained herein; and these suggested doses are not a substitute for clinical judgement. Neither ValueMD nor any other party involved in the preparation or publication of this site shall be liable for any special, consequential, or exemplary damages resulting in whole or part from any user's use of or reliance upon this material.


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