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Positron emission tomography scan
Learn how this imaging scan can play an important role in early detection of health problems, such as cancer, heart disease and brain disorders.
Endoscopic ultrasound
Learn more about this minimally invasive imaging test combining endoscopy and ultrasound to diagnosis digestive and lung diseases.
Stress test
This test gives important information about your heart health. Know how to prepare and what to expect.
Concussion
This brain injury can cause headaches, dizziness, trouble concentrating and other symptoms that often improve within days to weeks.
Video: HSG test for female infertility
Video animation shows the HSG test — an X-ray study to identify causes of female infertility.
Hematocrit test
Learn about this red blood cell blood test, including why it's used and what to expect.
Sentinel node biopsy
Learn what to expect during this procedure to remove lymph nodes for testing. The results can show whether cancer has spread.
Hodgkin's vs. non-Hodgkin's lymphoma: What's the difference?
Learn how types of lymphomas are determined using lab tests to examine cancer cells.
Asthma: Steps in testing and diagnosis
Think you or your child might have asthma? Here's what's involved in making a diagnosis.
Prostate cancer screening: Should you get a PSA test?
Learn about the pros and cons of the PSA test so you're ready to talk about prostate cancer screening with your doctor.
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