Volume calculation:
V = (H x W x D) X 0.625 mL1
H=height, W= width, D=depth
Volume by age = (age in years + 2) x 30 mL
Bladder wall thickness2
(ages 1 day to 19 years)
Site of measurement: sagittal plane: posterior inferior wall (away from rectum)
| Degree of distention | Thickness (mm) | SD (mm) | Range (mm) |
| Full | 1.55 | 0.56 | 1-3 |
| Empty | 2.76 | 0.58 | 2-4.5 |
References:
1. Haken berg OW, Ryall RL, Langlois SL, et al: The estimation of bladder volume by sonocystography. J Urol 1983; 130:249-251
2. Jequier S, Rousseau O. Sonographic measurements of the normal bladder wall in children. AJR 149:563-566, Sep 1987