The Merck Manual: Cardiovascular Tests and Procedures
- Concise descriptions detailing diagnostic procedures used in the detection of cardiac disease.
- http://www.merck.com/mmpe/sec07/ch070/ch070a.html

Atlas of Perioperative Echocardiography
- An on-line database of over 400 high-resolution still and video echocardiographic images, together with explanatory text and live ‘pubmed’ abstract links. A separate database describes the echocardiographic parameters of over 300 prosthetic heart valv
- http://www.manbit.com/ERS/ERSindex.asp

HeartScan
- Information on Electron Beam CT Scanning that can detect coronary artery disease in its earliest, most treatable stages. Provided by Abbott Northwestern Hospital/Minneapolis Heart Institute.
- http://www.heartscanmn.com/

RadiologyInfo: Heart and Vascular System Procedures
- Offers information about radiology techniques used for diagnosis and detection. Features images, FAQ's and benefits versus risks.
- http://www.radiologyinfo.org/content/menu-cardiovascular.htm

About.com: Common Heart Tests
- Offers information about diagnostic procedures used to identify conditions and diseases. Features discussions and links to related articles.
- http://heartdisease.about.com/cs/cardiactests/l/bltests.htm

American Heart Association: Diagnostic Tests and Procedures
- Features overviews of current detection methods used for diagnosis. Features short articles and links to related publications.
- http://www.americanheart.org/presenter.jhtml?identifier=504

TheMDSite.com
- Site for physicians offering information on rapid interpretations of EKGs with an interactive learning tool.
- http://www.themdsite.com/

ECG Library
- A collection of electrocardiograms, categorized by condition or abnormality as well as an overview of ECG axis and history.
- http://www.ecglibrary.com/