“…Less than two-thirds of studies were prospective (61.8%) and interpretation of tests were commonly performed post hoc without blinding (72.7%). In the majority of studies (67.3%), a confirmatory test was used as a reference standard, 18,22–25,28,29,31,32,34,36–42,44,47,50,53,55–59,61,63–67,69–74 and in nearly a quarter (23.6%), the same test was used as part of its own reference standard. 23,28,29,31,36–39,41,42,53,71,74 Few studies applied complete verification with the same reference standard to all participants (25.5%) and of those that did, only one study (1.8%) used an independent reference that was not contingent upon a confirmatory test (ie, adrenal vein sampling to identify unilateral aldosterone excess, and where it was assumed that patients without lateralization were negative).…”