Think Like a Doctor: This series of clinical cases will hone your diagnostic skills. See doctors' notes, lab reports, and imaging reports to help you find the answer.
New England Journal of Medicine Image Challenge: View the image and select the correct diagnosis.
Diagnosaurus: From Access Medicine. Search this site by disease or symptom to retrieve possible differential diagnoses.
Rational Clinical Examination: The articles in this series of systematic reviews from JAMA delineate definitive diagnostic strategies for patients presenting with various symptoms.
Duke University Health System Laboratory Test Catalogue: Information about procedures at DUHS, normal values, and some interpretive information about test results.
Lab Tests Online: A peer-reviewed site with lots of information about lab tests, why they are done, and what the results may mean.From the American Association for Clinical Chemistry.