Hi Likair,
Ditto to all the above twice (blood and protein), including the kidney biopsy. The first time they diagnosed Henoch Schonlein Purpura which you probably don't have or you would have noticed a purplish colouring on your legs. The second time, 10 years later, it was called Vasculitis which I think is an umbrella name covering several variations of the condition. On this occasion it was accompanied by little red bloodspots around the ankles which the consultant described as typical.
On neither occasion did I notice anything visually in my urine, it was spotted during a routine medical.
Both times were thoroughly investigated and monitored over a prolonged period, two years for the vasculitis; but at no time was my working life offshore affected.
As I am also hypertensive the treatment was, and still is, strict BP control to protect the kidneys.
Be patient (no pun intended) and good luck.
s37