Urine occult blood is not the same as hematuria. A positive urine occult blood can be observed by urine red blood cell count to see if the red blood cells in the urine exceed the normal value. In contrast, hematuria refers to an elevated urine red blood cell count above normal (referring to ≥3 red blood cells/HP in urine, centrifugal urine red blood cells >5
cells/HP, or 12
hour urine Addis count >500,000). If the microscopic count shows an elevated red blood cell count and the color is normal to the naked eye, it is called microscopic hematuria; in heavy cases, the appearance of flesh-washing water-like or contains blood clots. Usually 1mL of blood per liter of urine is visible to the naked eye and the urine is red or washed with water. If you find red urine, don’t be anxious, first determine whether it is real hematuria or affected by food or drugs, such as aminopyrine, sodium phenytoin, rifampin, beets, etc. can cause red urine, which is considered as pseudo-hematuria. Excluding these factors, the presence of true hematuria can be seen in urological diseases, systemic diseases and certain drugs, especially for middle-aged and elderly people who should be alert to the presence of urological tumors. If only positive urine occult blood is found while the urine red blood cell count is normal, there is generally no need to worry about it and seek medical advice in an emergency, and it can be observed regularly.