How accurate is the show "House"?? Or "ER" even?? Any medical drama?

My mom used to enjoy watching House and ER. Now she will only watch ER cos she claims that the medical stuff on ER could happen and the stuff on House is bogus. I would also like to know how far off the bogus ones are. Like could it maybe happen or do they sound mostly or kinda accurate?? Or are they just entierly farfetched??