programmed by Stephen Z Fadem

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THE PATIENT

Male Female
Feet inches Centimeters
Check anthropometric equations
feet inches
cms
Height in meters: xxx M
Weight in kg
Age in years

RESIDUAL KIDNEY UREA CLEARANCE

V24 hr urine: cc. Vurine = xxx liters
mg/dL mmol/L
Uurine urea nitrogen: ____
Pplasma urea nitrogen: ____

Measured in whole plasma (Europe)

RKC (uncorrected) : ???cc/min
RKC (Residual Kidney Urea Clearance): ??? cc/min/1.73m2

DIALYSATE CLEARANCE

Vdialysate: Liters/24 hr
Udialysate urea: ____
Purea: ___
Cdialysate uncorrected: ??? L/week
Cdialysate: ??? L/week/1.72m2

WEEKLY KT/V

kt/VWatson: ___
kt/VHume: ___
TBWWatson: ??? (anthropometric volume)
TBWHume: ???(anthropometric volume)
BSADubois: ??? (Body Surface Area)

FORMULA

  • Plasma Urea in USA is measured in Plasma Water. In Europe in Whole Plasma - correction factor = 1.07
  • RKC=V*U urea/Purea
  • RKCcc/min=RKC/1440
  • RKCcorrected=RKC*1.73/BSA;
  • RKCL/min=RKC/1000
  • RKCL/wk=RKCmin/cc*10080
  • Cdialysate=Durea*Vdialysate/Purea)*1.73/BSA
  • Kt/Vwk=(RKC+Cdialysate)/Vanthropometric
  • Alternatively Kt/Vweek=[(RKCuncorrected+Cdialysate - uncorrected)/V]*1.73/BSA
    • 10080=minutes/week =24 hours*7 days*60 min
    • 1440=minutes/24 hours
    • C=Clearance
    • P=Ureaplasma urea nitrogen
    • RKC = residual kidney function
    • D=dialysate
    • V = volume
    • U = urine

REFERENCES

  1. K DOQI 2006 Updates
  2. 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
  3. Hume R and Weyers E. Relationship between total body water and surface area in normal and obese subjects Clin Path 24(3):234-238, 1971
  4. DuBois D, DuBois EF.Clinical Calorimetry: Tenth Paper A formula to estimate the approximate surface area if the height and weight are known. Arch Intern Medicine. 17:863-71, 1916
  5. TOUCHCALC.com

© 2008-14, Stephen Z. Fadem, M.D., FASN. All rights reserved. No part of this application may be duplicated without written permission from the author.

DISCLAIMER:

The licensee or user understand and agree that the technology and content of this application are provided for educational purposes only. All calculations must be checked for accuracy and confirmed before use, clinical or otherwise. All medical decisions must be based upon the clinical judgment of a licensed physician. Licensee or user assumes the duty to have any and all laboratory values or calculations verified by a licensed physician. Neither licensor nor its associated authors or other entities warrant the accuracy of any information provided by or resulting from the technology or the content for clinical management, and licensee or user agree that no such persons or entities shall be liable for any adverse consequences resulting from the use of any of the same.

Licensee or user shall indemnify, defend and hold harmless licensor, its affiliates, and their respective officers, directors, owners, agents, information providers and employees from and against any claims, demands or causes of action whatsoever, including without limitation those arising on account of, or resulting from the exercise or practice of the license granted hereunder by licensee, its sublicensees, if any, its subsidiaries or other officers, employees, agents or representatives.

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