Is it blood? It could be, she says. The medical name for blood in the urine is hematuria. Other reasons for red or red-tinged urine may include blood from UTIs, she says. However, blood in the ...

Bilirubin is a byproduct of the breakdown of red blood cells ... causing blue or green-tinged urine. A child with blue diaper syndrome might have trouble gaining weight, or be diagnosed with ...