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Learning Center
Cholesterol level: Can it be too low?
A high cholesterol level is unhealthy — rarely, very low cholesterol may pose risks, too.
Cholesterol ratio or non-HDL cholesterol: Which is most important?
Non-HDL cholesterol may be more important than cholesterol ratio.
Ejection fraction: What does it measure?
This measurement, commonly taken during an echocardiogram, shows how well the heart is pumping. Know what results mean.
What is BPA? Should I be worried about it?
Find out more about BPA, a chemical used in some plastics and resins, and explore options for reducing your exposure.
Atypical cells: Are they cancer?
Atypical cells appear abnormal, but they aren't necessarily cancerous.
Small cell, large cell cancer: What this means
Cancer cells are classified by how they look under a microscope. Learn common terms used to describe cancer cells.
Sea salt vs. table salt: What's the difference?
Should you take health claims about sea salt with a grain of salt? What makes it different from table salt?
Thyroid peroxidase antibody test: What is it?
Sometimes this test is done to help figure out the cause of thyroid disease.
Warm-mist versus cool-mist humidifier: Which is better for a cold?
Warm-mist and cool-mist humidifiers are equally effective in humidifying the air.
Pap smear: Do I need one if I'm a virgin?
Doctors recommend regular cervical cancer screening whether you've had sex or not.
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