I live in France so I can only speak from the French perspective, but I've noticed that the doctors here are pretty thorough in ordering blood tests if there's the slightest doubt of anything. You get a prescription and then take it to an independent lab. You get a copy of the results.
Anyway, it helps for the docs to be on the watch for risk factors and order tests if they're in doubt. Some are on the ball and pro-active, others aren't. The public also needs to be better informed of their risks, especially in the food and alcohol sodden environment in which we live. I was a teenager in the 90s and an avid reader of magazines and the message at the time was that carbs have fewer calories than fat, so carbs are the better choice... My previous GP here in France also thought the same, and he's fresh out of medical school!