What is the most common type of renal stone composed of?
a. Struvite
b. Cystine
c. Calcium
d. Uric acid
ANS: C
The most common stone types are calcium oxalate or phosphate (70-80%). Struvite (magnesi-um-ammonium-phosphate) occurs 15% of the time. Cystine stoes are rare (less than 1%). Uric acid stones occur 7% of the time.
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