A Pap smear is a quick screening test that collects cells from your cervix to check for precancerous changes. The entire procedure typically takes only a few minutes, and while it can feel uncomfortable, it’s not usually painful. Here’s what to expect before, during, and after.
How to Prepare Beforehand
The sample your provider collects needs to be as clean as possible for accurate results. In the 48 hours before your appointment, avoid sexual intercourse, tampons, vaginal creams, and douching. All of these can wash away or obscure the cervical cells the lab needs to examine. If your period starts unexpectedly, it’s worth rescheduling, since blood can interfere with the sample quality.
What Happens Step by Step
You’ll undress from the waist down (or fully, depending on the office) and lie on your back on an exam table with your knees bent and your heels resting in footrests called stirrups. Your provider will explain each step before it happens.
First, a smooth, hinged instrument called a speculum is gently inserted into your vagina. The speculum opens to hold the vaginal walls apart so your provider can see your cervix clearly. This is usually the most noticeable part of the exam. You’ll likely feel pressure in your abdomen or vagina as it opens, but it shouldn’t be sharp or intense. If you tense your pelvic muscles, the sensation can feel stronger, so slow, steady breathing helps.
Once the cervix is visible, your provider uses a small brush, a flat scraping device called a spatula, or a combination tool to collect cells. The tip of the brush is placed into the opening of the cervical canal and rotated a full 360 degrees two to three times. This sweeps cells from the area where precancerous changes are most likely to develop. You may feel a brief pinching or scraping sensation during this step, but it lasts only seconds.
After collection, the speculum is removed and the exam is over. From start to finish, the hands-on portion rarely takes more than two or three minutes.
What Happens to the Sample
The collected cells are sent to a pathology lab for examination under a microscope. There are two main processing methods. In the conventional approach, cells are spread directly onto a glass slide and immediately preserved in alcohol to prevent them from drying out and distorting. In the more common liquid-based method, the brush tip is dropped into a small vial of preservative solution. This method produces a cleaner sample with fewer artifacts, which makes it easier for the lab to spot abnormal cells.
A trained cytopathologist examines the sample looking for changes in the shape, size, and organization of cervical cells. They’re specifically looking for signs that cells are developing abnormally, which can range from minor irritation-related changes to precancerous lesions. If your provider also ordered an HPV test, the same sample can be tested for high-risk strains of human papillomavirus, the virus responsible for nearly all cervical cancers.
What Your Results Mean
Results are reported using a standardized system called the Bethesda System. You’ll typically get them back within one to three weeks. The most common categories are:
- NILM (negative for intraepithelial lesion or malignancy): Normal. No precancerous or cancerous cells were found. This is the result the vast majority of people receive.
- ASC-US (atypical squamous cells of undetermined significance): Some cells look slightly unusual but not clearly abnormal. This is the most common “abnormal” result and is often caused by inflammation, infection, or low-risk HPV. Your provider may recommend an HPV test or a repeat Pap in a year.
- LSIL (low-grade squamous intraepithelial lesion): Mild cell changes, often linked to an HPV infection. Many LSIL findings resolve on their own, but your provider will want to monitor you more closely.
- HSIL (high-grade squamous intraepithelial lesion): More significant cell changes that have a higher chance of progressing toward cancer if left untreated. This result typically leads to a closer examination of the cervix called a colposcopy, where your provider can take a small tissue biopsy.
An abnormal Pap result does not mean you have cancer. It means cells need a closer look or more frequent monitoring. Cervical cancer develops slowly over years, which is exactly why routine screening catches problems early.
What to Expect Afterward
Most people feel completely fine immediately after a Pap smear and can go about their day normally. Light spotting or a small amount of bleeding for one to two days is common and happens because the brush disrupts the delicate surface of the cervix. This is nothing to worry about.
Contact your provider if you experience bright red bleeding heavier than spotting, bleeding that lasts longer than three days, severe pelvic pain, fever, or unusual discharge that is green, yellow, or foul-smelling. These are uncommon but worth getting checked.
How Often You Need One
Current guidelines from the U.S. Preventive Services Task Force recommend starting cervical cancer screening at age 21. Between ages 21 and 29, a Pap smear every three years is the standard approach. Starting at age 30, you have more options: a Pap smear alone every three years, an HPV test alone every five years, or both tests together every five years. After age 65, screening can stop if you’ve had consistently normal results and aren’t at high risk.
The key difference between the two tests is what they’re looking for. A Pap smear examines cells for visible changes. An HPV test checks for the presence of the virus that causes those changes. Using both together, or switching to HPV-only testing after 30, gives a wider safety net because it can catch a problem before cell changes even appear.