Golisano Children's Hospital / Pediatric Nephrology / Urine Collection Instructions Random Urine Collection Instructions Orthostatic proteinuria work-up consists of four separate urine samples collected for two consecutive nights and mornings. To collect urine samples: Collect a urine sample before bed, go directly to bed, and then collect another urine sample first thing in the morning Label sample with name, date and time collected Collect urine samples for two consecutive nights and mornings Take all samples to the lab for analysis Samples will be measured for protein:creatinine ratios