The most important confirmatory test is an ultrasound scan. US confirm gallstones, showing thickening and oedema of the gallbladder wall and localise the tender spot to the gallbladder itself. It can also exclude dilatation of the common bile duct and other pathology, such as liver masses.
Benign prostatic hypertrophy (BPH) is an extremely common condition in elderly men and is a major cause of outflow obstruction. Ultrasound has become the standard first line investigation after the urologist's finger. Typically there is an increase in volume of the prostate with a calculated volume exceeding 30 cc ((A x B x C)/2). http://radiopaedia.org/articles/benign-prostatic-hypertrophy