The National Institutes of Health (NIH)  Chelation Study

A very large study was initiated by the NIH to assess the effects of IV EDTA chelation therapy on circulatory disease. 
The study was temporarily halted (2008-2010), for reasons requiring better communication with study participants.
The study is currently under way again.

http://www.ncbi.nlm.nih.gov/pubmed/22172430

http://nccam.nih.gov/health/chelation

http://www.npr.org/templates/story/story.php?storyId=5605772

The Medical Argument Against Chelation Treatment

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1. The Testing Labs are not comparing your numbers to known populations of normal people (because heavy metal loads in healthy populations has never been studied.  The labs are doing two other things instead...  a) they are comparing their patient population to each other (even thought that population is large), and b) they are helpful in comparing a patient's improved state to the same patient's ill state.  They are comparing the same patient to him/herself over time, that is, before and after chelation treatment.

2. Even when compared against the small numbers of "normal healthy" people, we need more proof, more healthy people to test.

3. The chelator might be "collecting" large amounts of poison that you ate for breakfast on the day you got tested.

4. The chelator might be "collecting" poison that is locked away in your body in "SAFE PLACES" like bone, fat, liver.

5. No one knows how much poison is actually poisonous to each different kind of human body.

6. Different individuals have different tolerances:  Gender, child, adult, senior, excretion genes.  In other words, it's fine for healthy people to be exposed to poison at levels that are known to harm other people.

7. Chelation is such a powerful "ion vacuum" that it even "sucks out" a large amount of good minerals in the body, throwing the good out with the bad, and taking vitamins to replenish those minerals is "too difficult for patients to do."

8. One time, a chelation doctor grabbed the wrong bottle off the shelf and a child patient died as a result.

9. Poisoning takes a long time to accumulate in a body, and if chelation (becoming slowly UN-poisoned) does not fully cure you in 3 months, that's proof that it's not working.

10. I did not learn about Chelation in school, so it must be wrong.