Fitness basics
Learning Center
Cholesterol level: Can it be too low?
A high cholesterol level is unhealthy — rarely, very low cholesterol may pose risks, too.
Heart rate: What's normal?
A normal resting heart rate for adults ranges from 60 to 100 beats per minute. A heart rate above or below that may signal a problem.
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.
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.
Exercise and illness: Work out with a cold?
Play it smart. Ease up on exercise if you have a cold.
Doppler ultrasound: What is it used for?
A Doppler ultrasound measures blood flow and pressure in blood vessels.
Autism spectrum disorder and digestive symptoms
Children with autism spectrum disorder often have other health issues, including problems related to digestion.
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