What would cause blood in your urine? i take uti test negative for uti but positive for blood?

Blood in urine: If a UTI is ruled out, blood can come from the kidneys, stones in the ureters, bleeding from the bladder or from glomerular diseases of the kidney. See a urologist for a diagnosis of any bleeding from the kidney or its outflow tract and bladder. If no source is found, see a nephrologist to see if the glomerulonephritis is the cause of the bleeding. Good luck.