Koff developed a simple score for predicting the bladder capacity in normal pediatric patients.
Patient selection: pediatric, ages 5 to 12
(1) age in years
predicted bladder capacity in ounces =
= ((age in years) + 2)
predicted bladder capacity in mL =
= ((age in years) + 2) * 29.59
or if simplified:
= ((age in years) + 2) * 30
According to Berger et al, the standard deviation is 2 ounces.
After age 12 the predicted bladder volume is 390 mL (30*12+30).
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Specialty: Nephrology, Clinical Laboratory