For patients with acute renal failure and possible urinary retention, do you obtain a bedside bladder POCUS exam before ordering renal imaging or placing a Foley catheter?

Bedside Bladder Ultrasound has a strong role in the evaluation of acute urinary retention (AUR) as a possible cause for acute renal failure. Practice varies, as does the evidence base, but most POCUS experts recommend ultrasounding both the bladder (to assess for post-void residual volume) and both kidneys for hydronephrosis in their evaluation. Most agree this should be completed not only in patients for whom you have a high suspicion of acute urinary retention but even in patients at lower risk, given the ease of the assessment and benefits of early diagnosis. In patients with moderate/high risk for AUR, a bladder volume >500 ml had an incredibly high specificity (96.3%) and strong + likelihood ratio (10.8) for AUR. Interestingly, bladder...