. Author manuscript; available in PMC: 2014 Oct 1.

Published in final edited form as: Urolithiasis. 2013 Jul 24;41(5):389–394. doi: 10.1007/s00240-013-0591-6

Table 1.

Culture results of PCNL patients grouped by stone mineral content.

Stone Mineral Content	Both Negative	Positive Urine Culture	Positive Stone Culture	Both Urine and Stone Culture Positive
Struvite	6 (9.4)	11 (17.2)	7 (10.9)	40 (62.5)
Apatite	21 (16.9)	22 (17.7)	19 (15.3)	62 (50)
Other	37 (20.6)	46 (25.6)	30 (16.7)^*	67 (37.2)^*
Total	64 (17.4)	79 (24.5)	56 (15.2)	169 (45.9)

PCNL: percutaneous nephrolithotomy. Struvite includes any patient with any struvite reported in the stone analysis, regardless of the percentage. Apatite includes patients with no struvite and >50% apatite (either reported as hydroxyapatite or carbonate apatite). Other is all non-struvite, non-apatite patients.

Fraction of stone cultures that were positive (summing all positive stone culture results, ignoring urine culture results) was significantly less than for Struvite and Apatite groups, p<0.05.