Skin care
Learning Center
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.
Blood glucose monitors: What factors affect accuracy?
Consider these factors when measuring blood sugar levels with blood glucose monitors.
Cholesterol level: Can it be too low?
A high cholesterol level is unhealthy — rarely, very low cholesterol may pose risks, too.
Does sunscreen expire?
Wondering whether sunscreen expires? Get the facts about how long sunscreen lasts.
Cholesterol ratio or non-HDL cholesterol: Which is most important?
Non-HDL cholesterol may be more important than cholesterol ratio.
Thyroid peroxidase antibody test: What is it?
A thyroid peroxidase antibody test can help determine the cause of thyroid disease.
Ejection fraction: What does it measure?
This measurement, commonly taken during an echocardiogram, shows how well the heart is pumping. Know what results mean.
Shaving hair: Does shaved hair grow back thicker?
Contrary to popular belief, shaving unwanted hair doesn't make it grow back thicker.
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.
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