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©2013 UpToDate ® Print Email Table showing the effect of body weight on Kt/V and creatinine clearance among peritoneal dialysis patients Body weight ratio, actual to desired <.09 0.9-.11 >.11 Percent of patients 19 33 48 BWa/BWd 0.82 1.01 1.37 Kt/Va 1.95 2.08 1.94 Kt/Vd 1.74 2.08 2.25 CCra, L/week 68.1 71.5 64.1 CCrd, L/week 62.6 71.7 72.4 Effect of body weight, using actual (a) and desired (d) values, on Kt/V and weekly creatinine clearance (CCr). If the actual weight is used, patients well below the desired weight (ratio between actual and desired weight below 0.9) will overestimate solute clearance, while those well above the desired weight (ratio above 1.1) will underestimate solute clearance.