Stress basics
Learning Center
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.
Female orgasm: No climax with vaginal penetration?
Not all women have orgasms with vaginal penetration during sex. Most women need stimulation of the clitoris to climax.
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.
Overdue pregnancy: What to do when baby's overdue
Past your due date? Understand why a pregnancy might be overdue and what's next.
Video: HSG test for female infertility
Video animation shows the HSG test — an X-ray study to identify causes of female infertility.
Endoscopic ultrasound
Learn about this imaging test that uses both endoscopy and ultrasound. The test helps diagnose diseases related to digestion and the lungs.
MRI: Is gadolinium safe for people with kidney problems?
Older gadolinium contrast agents used with MRI posed a risk for people with severe kidney failure. Newer versions are much safer.
Stress and hair loss: Are they related?
Learn how stress and hair loss can be related.
Cholesterol test kits: Are they accurate?
Home cholesterol test kits are often as accurate as the test a health care professional uses, but the quality of results can depend on how well you follow the directions for the test.
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