He's most likely doing routine tests for what ever your symptoms happen to be. They do Regular blood tests to rule out things like Diabetes,Kidney Disease, over active thyroid. They do this because the symptoms can be the same for several diffrent diseases/problems.
I recently had roughly 9 diffrent Liver,Kidney,Prostate,Diabetes done as general blood work. If it makes you feel better all my tests came out fine. It's natural to worry when a doc says it's routine but he's basically trying to hone in on if anything is wrong so he starts with blood tests.
I'm not sure about the liver count thing but I'd say it's a best bet not to worry 2 much and just wait for the results. Don't the mistake of worrying a bunch like I did.

Good Luck