Order aldosterone blood testing online
In the majority of US states you can order aldosterone testing online and have the blood drawn at a local blood draw center (see my general overview of the process).
Here are the companies I've found that allow you to order aldosterone directly:
Take a look at my state-specific issues page if you're in AZ, MD, NJ, NY or RI.
Understanding the results
The American Association for Clinical Chemistry has helpful pages for understanding the test and answering common questions.
If you're interested in self-testing as I am, check out my Facebook or Twitter account where I post interesting self-testing news and get a little too excited about blood test sales.