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high-low limits for bloodwork tests = percent population?

high-low limits for bloodwork tests = percent population?

I don't know where to post this, but I figure that people in this community have done a lot of blood work. Here is my question.

Can someone explain how typically the high-low limits are set for various tests on blood work?  I figured it was supposed to represent a high-percentage of the normal population falling within the limits.  It seems that when I'm at the limit or slightly exceeded the limit, doctors are rather dismissive of the importance, so that's why I ask. Thanks.
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