what defines gross hematuria
Hematuria is defined as the abnormal presence of red blood cells (RBCs) in the urine and is commonly divided into gross and microscopic hematuria. Gross, or visible, hematuria can result from as little as 1 mL of blood in 1 L of urine, and therefore the color does not reflect the degree of blood loss. Also, numerous other substances can induce such a color change (see later, âSigns and Symptomsâ).