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Characteristics of study subjects.
| Subjects with emergency department (ED) diagnosis of renal colic | 511 |
| Subjects with computed tomography (CT) evidence of stone | 198 |
| Subjects with CT evidence of stone and ED bedside ultrasound (US) performed | 125 |
| Gender (% female) | 37% |
| Mean age (years) | 40.5 |
| Bedside US evidence of stone | 98 |
| Mean stone size | 7.66 mm |
| Mean number of stones | 1.26 |
