Table 1. Percentage of WD patients with abnormal copper studies, adapted from Steindl et al. (24).

Subgroup	Hepatic (%)	Neurologic (%)
Serum ceruloplasmin (<20 mg/dL)	59	85
Urine copper (>100 µg/day)	90	78
Liver copper content (>250 µg/gm)	90	93
KF rings (on slit lamp examination)	41	90

WD, Wilson disease; KF, Kayser-Fleischer.