Can a Pap Test Find an Endometrial or Uterine Polyp?

Not reliably. A standard Pap test (Pap smear) is not designed to find or diagnose endometrial polyps (growths inside the uterine cavity), and you should never rely on a normal Pap test to rule one out ^[1][2]. A Pap test screens for cervical cancer by collecting cells from the cervix—the lower, narrow end of the uterus. Because uterine polyps grow higher up inside the uterine cavity, they usually do not shed cells that show up on a Pap test ^[1].

Why a Normal Pap Test Doesn’t Rule Out Polyps

It is easy to confuse cervical screening with an evaluation of the entire uterus. If you are experiencing symptoms such as heavy periods, bleeding between periods, or bleeding after menopause, a normal Pap test does not mean your uterus is clear of polyps or other issues ^[1].

A Pap test is simply not designed to evaluate the uterine cavity. It cannot reliably detect polyps, fibroids, or endometrial cancer ^[1][2]. A normal result just means the test did not find the targeted cervical abnormalities. Abnormal bleeding can have many causes, and any bleeding after menopause—even a single episode—requires timely medical evaluation to rule out other conditions, including endometrial cancer, regardless of a normal Pap test ^[3].

(Note: Seek urgent medical care for very heavy bleeding, such as rapidly soaking through pads, fainting, severe dizziness, or severe pelvic pain.)

Incidental Clues on a Pap Test

Very rarely, a Pap test might incidentally pick up atypical glandular cells (abnormal cells from the glandular tissue) or unexpectedly shed endometrial cells (cells from the uterine lining) ^[4][5].

Finding these cells is an uncommon incidental finding, not a reliable screening method. The next steps depend on the specific cells found, your age, and your menopausal status:

• Benign-appearing endometrial cells: The significance of these normal-looking cells depends on age and menopausal status. Doctors generally investigate further if you are postmenopausal or over age 45 ^[5][6].
• Atypical glandular cells: This finding usually requires a separate evaluation of the cervix as well as an evaluation of the endometrium, especially in patients 35 or older or those with specific risk factors ^[4].

While investigating these out-of-place cells, a doctor might discover an endometrial polyp, but this is an incidental discovery rather than the direct result of a polyp test ^[4].

How Uterine Polyps Are Actually Diagnosed

If you have abnormal bleeding or your doctor suspects a uterine polyp, a thorough evaluation usually begins with a pelvic examination and may include tests that look directly at the inside of your uterus.

• Transvaginal Ultrasound (TVUS): Often the first step, this imaging test uses a wand inserted into the vagina to look at the uterus and its lining ^[7][3]. While it can identify many polyps, it can sometimes miss smaller ones or have trouble distinguishing a polyp from a naturally thick uterine lining ^[7][3].
• Saline Infusion Sonohysterography (SIS): Also called a saline ultrasound, this test involves gently injecting sterile saltwater into the uterus before taking ultrasound pictures. The fluid expands the cavity, making it much easier to clearly see polyps ^[3]. Research shows SIS is substantially more accurate than a standard ultrasound for diagnosing polyps ^[7].
• Hysteroscopy: This is the most direct diagnostic approach when imaging is inconclusive or a polyp is suspected. A doctor inserts a thin, lighted camera (hysteroscope) through the vagina and cervix to look directly inside the uterus ^[3]. If a polyp is found, it can often be removed during the same procedure. The removed tissue is always sent to a pathology lab to confirm whether it is benign, atypical, or malignant ^[3].

What about an endometrial biopsy?
An office endometrial biopsy uses a small suction catheter to sample the uterine lining. While a biopsy is very useful for checking for diffuse changes like endometrial overgrowth (hyperplasia) or cancer, it is a “blind” test. Because it does not use a camera, the catheter might sample the tissue right next to a small, localized polyp and completely miss it ^[8][9]. Therefore, a normal biopsy does not reliably rule out a polyp, and persistent bleeding should still be evaluated ^[8].