When I was a trainee version of my current job 20 years
ago I had to mash together three days worth of patients’ shit that was in a plastic bag and then take out about 100ml and do some very basic science stuff.
It was a test to determine how much fat was in the poo. Most of the patients had Cystic Fibrosis and it helped their dietians to determine their diet in accordance with a food journal they kept.
It was pretty nasty but had a valid reason. Certainly disgusting but would do it again if I had to. (But y’know not actively).