If you are testing low commonly, you should be tested for Addison's disease.
http://en.wikipedia.org/wiki/Addison%27s_disease
Some drugs will cause this too.
diuretics
Here is a more complete list:
http://www.aafp.org/afp/2004/0515/p2387.html
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Weezie looking at petunias 8.25.2017
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