First trimester
Learning Center
1st trimester pregnancy: What to expect
The first few months of being pregnant can bring physical and emotional changes, such as breast tenderness, nausea, anxiety and excitement.
A1C test
Learn more about the preparation for and results of this common diabetes blood test.
ANA test
An antinuclear antibody (ANA) test is one test used to help determine if you have an autoimmune disease such as lupus.
Asthma: Steps in testing and diagnosis
Think you or your child might have asthma? Here's what's involved in making a diagnosis.
Atypical cells: Are they cancer?
Atypical cells appear abnormal, but they aren't necessarily cancerous.
Auditory processing disorder (APD)
This type of hearing loss involves the brain. Learn about ways that can help people with the condition hear better.
Autism spectrum disorder
Autism spectrum disorder is a serious condition related to brain development that impairs the ability to communicate and interact with others.
Autism spectrum disorder and digestive symptoms
Children with autism spectrum disorder often have other health issues, including problems related to digestion.
BRCA gene test for breast and ovarian cancer risk
Find out what to expect if you're considering a blood test to determine if you have an increased risk of breast cancer. Learn what your results might mean.
Baby naps: Daytime sleep tips
Know when and how long babies need to nap, how to put them down for naps and how to handle fussiness.
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