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Monday, October 11, 2010

Table : US Characteristics of Normal Kidneys
FeatureNormal Characteristic
Size Length:
Adult:
9-13 cm
(decreases with age)
Male:
11.4 cm median length
Female:
10.9 cm
median length
Volume:
(length × width
× height
× 0.52)
Adult: Male: range:
109-194 mL
151 mL median
volume
Female: range:
91-151 mL
122 mL median
volume
Parenchymal
thickness:
Normal >10 mm
Echogenicity of cortexAdult:
renal parenchyma
echogenicity
equal to, or slightly
less than, normal liver
parenchyma
Neonate:
renal parenchyma
echogenicity
usually greater
than normal liver
parenchyma
Echogenicity of medullaAdult: slightly
less than
renal cortex
Neonate: much
less than
renal cortex
SurfaceSmooth,
well-defined,
slightly lobulated
with V-shaped
notches between lobes
Peak systolic velocity in main
renal artery
Normal <180>
Renal/aortic velocity ratioNormal <3.5
Resistive index–intrarenal
arteries and main renal artery
Adult: Normal <0.70>0.70
Systolic rise time (time to early
systolic peak) in main renal
artery


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