I had blood sugar levels over the recommended some years back and was told I was borderline diabetic. BS! - and didn't change my diet one bit. Today they are normal. Go figure.
Yesterday, at 2am I awoke with serious pain in the left kidney. No sleep - no relief. Wife says: "stones". Bugger! I was pewking it was that painful. ShropDoc says get down here for 6am, but take some pain killers in the meantime. It eased off some, and so I didn't attend. The 'stones' came through as very fine sediment - I was lucky! No pain, no more blood in the pee (never had that before at any time), and back to normal. Must drink more. Water that is. 18hrs later back to being fine an dandy. Pity the poor sods who have stones measured in mm's!!
Currently 14st 3lbs and 70yrs.
Tests can be deceiving, I think it depends on who's doing them, and under what circumstances. That's not to say you should poo poo them, but some local surgeries have staff that are less than able in their diagnosis and competency, though the doctor who spotted my possible pulmonary embolism was spot on! Dodged a bullet on that one.