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Hello. Thanks for the question.
That ALT is pretty unremarkable. I don't really get too worried until they're well into the 200's or > 300. In those dogs, I'll get more concerned and look for a cause. 156 is mildly elevated and probably not a big deal.
The Metacam that she's on should be fine. I would check kidney and liver enzymes every 6 months with chronic anti-inflammatory use. Other than that, I wouldn't do anything different.
I hope this helps, let me know if you have any other questions.