Comprehensive Sites Covering Most Tests

These huge sites are also typically the highest quality; they tend to include more leading references and, despite their size, are often the easiest to navigate. They feature large, hyperlinked indices, so that locating specific information is easy.

As the population has aged, the need for more and highly accurate medical tests has become more acute. Although this listing is not meant to be exhaustive by any means, it does provide an overview of the more common tests, the expected outcomes, and what results outside the "normal" range could mean. Be sure and consult with your physician before trying to interpret a medical test yourself, even with the help of a well-meaning chemical technician. Remember - this section is a guide only, and not a substitute for a discussion with your healthcare provider.
Site Comments
Great! Nice, simple chart with test, where it's taken from (serum, plasma, etc.), and the normal range in two different unit systems.
An unusually easy-to-use site for quick answers to any question you might have about a blood test. "Our site provides information about conditions and answers to medical questions for physicians, nurses, physician assistants, med students and patients. The information and topic review consists of thousands of medical questions and answers in an easy to use flash-card format." The parent site is flash-med.com, featuring many useful utilities - worth a check!
"MedlinePlus is the National Institutes of Health's Web site for patients and their families and friends. Produced by the National Library of Medicine, it brings you information about diseases, conditions, and wellness issues in language you can understand. MedlinePlus offers reliable, up-to-date health information, anytime, anywhere, for free." Laboratory Tests is one of their projects, and it's a real winner.
"Lab Tests Online has been designed to help you, as a patient or family caregiver, to better understand the many clinical lab tests that are part of routine care as well as diagnosis and treatment of a broad range of conditions and diseases. If you are a medical professional, this site can serve as a quick reference tool or as a resource for keeping up with advances in laboratory science."
Lab Tests Online -
Useful Indices
The following links are to very useful sections or pages of the Lab Tests Online site, especially tables, indices, etc.
Huge, single-page index that, being devoid of graphics and other space--eaters, loads in a flash. Navigation between its numerous intermediate indices is intuitive and trivial. Really nice way to find a specific medical test.
Huge, single-page index that is formatted exactly like the Test Index described above. It's very easy to locate a specific condition to learn what tests are commonly used to diagnose and/or treat the condition.
Possibly the best of its kind on the Internet. Subgroups include such testing as Clinical Testing, Pharmacogenomics (matching of potential drugs with patient's genetic profile), and much more.
The Univ. of Iowa Healthcare site is one of the best overall medical information sites around. This particular area is worded for a lay audience, so that multipurpose tests like a CBC, e.g., are described in a clear, stepwise fashion.
Top-notch site from the great WebMD site, as part of their excellent "A-Z" series.
From the excellent MedicineNet site, a thorough, complete reference
As often happens with Wikipedia, its many authors have, through constant improvements, brought this resource to near the pinnacle of an Internet reference site. If you can't find it here, there's probably no test for it.

The following links point toward sites that concentrate on a common, specific condition or illness

ADHD
ADD and ADHD Center another excellent resource from WebMD. As opposed to most ADHD sites, they point out that ADD can strike at any age.
Sites with Excellent Sections on ADD/ADHD: Mayo Clinic CDC NIH PubMed Health
National Resource Center on ADD/ADHD "The nation's clearinghouse for science-based information about all aspects of attention-deficit/hyperactivity disorder (ADHD)"

Aging
50 And Over from WebMD, a large, well-organized resource for anyone near or over 50.
AARP's Health News an amazingly complete, well-organized site that touches not just health issues, but related topics such as prevention, wellness, etc.
Medical News and Information from the excellent GoSeniors.net site, a great collection of medical articles, alerts, etc. which apply to those >50

Alcoholism
Alcoholism 101 from the great About.com site, this provides an excellent summary of most things you need to know about this illness.
Alcohol Abuse Screening Quiz a very good, reliable, 20-question screening quiz to see if you or a friend has a problem.
Alcohol Withdrawal Symptoms Quiz 20 questions designed to see if you or a friend are physically addicted to ethanol.
Adult Children of Alcoholics Screening Quiz a screening instrument for codependency - an addictive illness every bit as serious as alcoholism.