A pacemaker is a small electronic device that helps regulate slow electrical problems in the heart. The pacemaker is usually implanted in the chest, just below the collarbone. A pacemaker may be recommended to keep the heartbeat from slowing down to a dangerously low rate.

A pancreas scan uses nuclear radiology to search for, and sometime treat, tumors in the pancreas.

For a Pap test, your healthcare provider will collect and examine cells from your cervix. The cervix is the opening to the uterus. They will do this test to screen for cervical cancer and other problems.

Detailed information about peak flow measurement, a quick test to measure air flowing out of the lungs.

A pelvic ultrasound is a scan that looks at the organs and structures in your pelvic area. Read on to learn details about what to expect before, during, and after this scan.

Pleural biopsy is a procedure to remove a tissue sample from the membrane that surrounds the lungs called the pleura.

A positron emission tomography (PET) scan is a type of nuclear medicine imaging test. It is used to examine various body tissues to identify certain conditions by looking at blood flow, metabolism, and oxygen use. PET scans may also be used to see how well the treatment of certain diseases is working.

A prostate biopsy is done after other tests show that there may be a problem with the prostate gland. It is the best method to diagnose prostate cancer. Read on to learn what to expect before, during, and after the procedure.

Pulmonary angiogram is an X-ray image of the blood vessels of the lungs.

Pulmonary function tests (PFTs) are noninvasive tests that show how well the lungs are working. Read on to learn what to expect before, during, and after these tests.

Pulse oximetry is a test used to measure the oxygen level (oxygen saturation) of the blood. It is an easy, painless measure of how well oxygen is being sent to parts of your body furthest from your heart, such as the arms and legs.