What color of urine indicates the presence of blood?

The presence of blood in urine, also known as hematuria, can lead to a change in its color, making it appear reddish or pink. This change can occur due to a variety of reasons including urinary tract infections, kidney stones, or injury to the urinary tract. The reddish hue signifies that there are red blood cells or other blood components present, which is a clear indicator that medical attention may be necessary to determine the underlying cause of the bleeding.

Clear urine usually indicates adequate hydration and the absence of significant waste or blood. Dark yellow urine might suggest dehydration or concentrated waste but does not specifically indicate blood presence. Pale yellow urine is often a sign of good hydration and has no association with blood. Thus, the reddish color is the most definitive sign related to the presence of blood in urine. Recognizing this change is crucial for prompt medical evaluation and treatment.