Culdocentesis

Culdocentesis is a procedure that checks for abnormal fluid behind your vagina in an area called the posterior cul-de-sac, or pouch of Douglas. Certain medical conditions can cause fluid to build up in this area. Your healthcare provider may perform culdocentesis when they need to remove fluid and test it to help find the cause of an infection or other problem.

Ultrasound has largely replaced culdocentesis because it can detect abdominal fluid and is less risky. Surgeons may also use image-guided surgical techniques instead of culdocentesis.

What is culdocentesis used for?

Some medical conditions and infections cause irregular fluid to fill your posterior cul-de-sac. If your healthcare provider suspects the fluid is abnormal, they may perform culdocentesis.

Some reasons for culdocentesis are:

• Rupturing of an ectopic pregnancy
• Pelvic inflammatory disease (PID)
• Ruptured ovarian cysts
• Endometriosis
• Uterine fibroids
• Trauma to your pelvis
• Pain in your pelvis or lower abdomen

How should I prepare for culdocentesis?

You don’t need to do much to prepare for culdocentesis. You’ll probably receive local anesthesia to numb your vagina. You may need someone to drive you home afterward.

What happens during this procedure?

Your healthcare provider inserts a thin needle through your vaginal wall to get a sample of fluid.

The steps of the procedure typically involve:

1. Your healthcare provider performs a pelvic exam and inserts a surgical instrument to lift up your cervix.
2. They numb an area of your cervix to make you more comfortable.
3. They insert a thin needle through the wall of your vagina. The needle is attached to a syringe that collects fluid.
4. Your provider removes a sample of fluid from your posterior cul-de-sac through the needle.

The entire process takes less than 10 minutes.

What are the potential benefits and risks of this procedure?

The benefit is that it can help your provider diagnosis an infection or other problem.

Risks of culdocentesis include:

• Poking a hole in your uterus or rectum
• Infection
• Puncturing blood vessels, cysts or tumors

What happens after culdocentesis?

Your provider will send the fluid sample to a lab for testing. You may be uncomfortable or feel crampy after culdocentesis, but this should go away within 24 to 48 hours.

Your healthcare provider will let you know what your results mean, usually within one week.

What do the results mean?

A normal result means your fluid is clear. There may be a problem if testing finds:

• Bloody fluid
• Pus-filled fluid
• Large amounts of clear fluid

For example, yellow, pus-filled fluid indicates an infection. Blood that doesn’t clot means an ectopic pregnancy has ruptured. This is because blood from your cul-de-sac area doesn’t clot.

The fluid may need to be drained or treated with antibiotics depending on the test results.

When should I call my healthcare provider?

Contact your healthcare provider if you have severe pain in your abdomen or pelvis. If you’ve had culdocentesis, call your provider if you have heavy bleeding, pain or flu-like symptoms.

What is the role of culdocentesis in ectopic pregnancy?

In the past, culdocentesis helped diagnose a ruptured ectopic pregnancy before ultrasound was widely available. At that time, ectopic pregnancies often weren’t found until they ruptured and caused bleeding. Today, ultrasound can usually detect an ectopic pregnancy earlier, so culdocentesis isn’t necessary.

Why is this procedure rarely done today?

There are safer, less invasive tests that can give the same information. These tests are usually faster and carry fewer risks.