For patients and families
About this health information
The health pages explain common conditions and tests. They do not replace an examination or advice from a clinician who knows your medical history.
Make decisions with your clinician
Do not start, stop or change prescribed medicine based on a website article. Bring your reports and questions to an appointment.
When to seek urgent help
Vomiting blood, black stools, severe confusion or trouble breathing need urgent medical care. Go to an emergency department; this website is not an emergency service.
Reading test results
A number on a blood test or scan rarely tells the whole story. The laboratory’s reference range, your symptoms and other results all matter.