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Learning Center
Doppler ultrasound: What is it used for?
A Doppler ultrasound measures blood flow and pressure in blood vessels.
Ejection fraction: What does it measure?
This measurement, commonly taken during an echocardiogram, shows how well the heart is pumping. Know what results mean.
Eye dilation: Necessary with every eye exam?
Eye dilation is part of a comprehensive eye exam. How often you need it depends on your age and health risks.
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.
How do COVID-19 antibody tests differ from diagnostic tests?
Antibody testing shows whether you've had the COVID-19 virus in the past. It's not the same as testing to see whether you have the virus now.
Is a home sperm test useful?
Using a home sperm test to check your fertility may not provide a clear answer.
Latent autoimmune diabetes in adults (LADA): What is it?
Latent autoimmune diabetes in adults (LADA) is a slow-developing form of diabetes.
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.
Pap smear: Do I need one if I'm a virgin?
Doctors recommend regular cervical cancer screening whether you've had sex or not.
Pap smear: Still needed after hysterectomy?
If you've had surgery to remove your uterus, you might not need routine Pap smears. Find out what doctors recommend for cervical cancer screening.
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