The methylene blue test was performed by injecting a dilute blue solution into the bladder from a catheter to observe the leakage of urine. The purpose is to examine small vaginal vaginal pupils, multiple small pupils, or pupils in scars that are difficult to identify with the naked eye; or to identify vesicovaginal fistula and ureterovaginal fistula.

Basic Information

Specialist classification: urinary examination classification: physical examination

Applicable gender: whether women are fasting: not fasting

Analysis results:

Below normal:

Normal value:
no

Above normal:

negative:
Check for no urine outflow.

Positive:
Know the number and location of pupils. From the cervix or its laceration, it can be bladder cervix or bladder uterus. If no blue fluid flows out, it should be suspected to be a ureteral fistula.

Tips: Forbidden sexual intercourse for the first three days of the examination. After 8 pm on the day before the medical examination, you should fast. The examination should be 3-7 days after the menstrual cleansing. Normal value

Check for no urine outflow.

Clinical significance

Abnormal results:

From the vaginal wall, there is a blue fluid outflow for the bladder vaginal fistula. At the same time, the number and location of the pupils can be known. From the cervix or its laceration, it can be bladder cervix or bladder uterus. If no blue fluid flows out, it should be suspected to be a ureteral fistula. At this time, the catheter can be removed, such as blue liquid quickly overflowing from the urethra, further testing, exclusion of ureterovaginal fistula, should also be thought of as the possibility of stress urinary incontinence.

People who need to be examined: people who have symptoms of leakage of urine, fever, bloating, and ascites.

Positive results may be diseases: urinary fistula, ureteral injury precautions

Pre-inspection contraindications: sexual intercourse is prohibited for the first three days of the examination. After 8 pm on the day before the medical examination, you should fast. The examination should be 3-7 days after the menstrual cleansing. 3-5 days before surgery, take a bath with 1:5000 potassium permanganate solution. For external use of genital eczema, zinc oxide ointment should be cured after surgery. Elderly patients or amenorrhea, oral estrogen preparations should be taken for half a month before surgery to promote vaginal epithelial hyperplasia, which is conducive to wound healing.

Requirements for inspection: Checking for relaxation, checking may cause physical and psychological burdens, should be actively faced, and actively cooperate with the inspection. The catheter remains for 7-14 days. The amount of fluid after surgery should not be less than 3000ml per day, and a large amount of urine should be used to flush the bladder to prevent urinary tract infection. Keep the vulva clean and dry. Continue to give broad-spectrum antibiotics to prevent infection after surgery.

Inspection process

The patient took the knee and chest position, inserted the catheter through the urethra, and added the methylene blue dilution solution (2 ml of methylene blue to 100-200 ml of normal saline. If no methylene blue can be used to dilute the gentian violet solution or sterilized milk), the bladder was injected into the bladder. Clamp the catheter. During the injection process, the posterior wall of the vagina was pulled and the blue liquid outflow was observed from the anterior wall of the vagina, the anterior malleolus and the cervix.

Not suitable for the crowd

Inappropriate people: menstruating women.

Adverse reactions and risks

Nothing.