Hematuria can indeed be a sign of lupus activity but I believe that this should be accompanied by the passage of dysmorphic red blood cells, casts, and proteins in the urine. Sometimes, a hematuric - looking urine may actually be from other causes aside from the red blood cells. These can be due to increased bile (as a result of bile duct obstruction) or some form of infection.
I suggest you talk to your doctor regarding other tests to determine the renal activity of the lupus which includes serum complement tests (C3 levels) and possibly a renal biopsy if warranted.
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