The standard length of the exposed female urethra generally refers to the exposed length of the female catheter, the exposed portion of which is generally not specifically required and is usually 5 to 15 cm. The female urethra is generally 3 to 5 cm long and has a diameter of about 0.6 cm. The length of the urethra varies slightly depending on body size. Usually during catheterization, after inserting the catheter urine flow still need to continue to insert about 2cm, so the general length of the catheter insertion is about 7 to 8cm, the exposed part of the catheter is the remaining catheter, but due to individual differences, the length of the catheter is slightly different. Because the female urethra is shorter, so it is very easy to cause urinary tract infection, usually should pay more attention to the perineum clean, more change underwear, in the catheterization should also strictly abide by the principle of aseptic operation.