Basic screening bloodwork for someone of Nick's age would be pretty limited as for as evidence goes - the only things with any indication would be a diabetes screen with a HbA1c and a cholesterol profile.
Vitamin D as a lab test remains trendy. There's an argument to be made that everyone in northern latitudes should just be on a daily supplement for life anyway and to not bother testing because everyone is low, especially in Minnesota. Low Vitamin D doesn't really mean much anyway besides future bone health and perhaps as a canary-in-the-coal-mine for general infirmity.
Otherwise, there's just not that much screening bloodwork indicated in your average early 40 year old male.
Next sorts of things would probably be STI screening, but this is often skipped in married men.
Nick's a little too young for screening for prostate stuff with PSA, and the test is mostly useless anyway.
My experience is that US docs order a lot more "screening" bloodwork for healthy patients than elsewhere, often ticking off all the boxes on the form willy-nilly. So it's possible he had routine things checked like his cell counts, his thyroid, his kidney function, his electrolytes, his iron/B12 etc.
Finally, we come down to his liver. A lot of this comes down to his self-reporting on his drinking to his doc and what his MD (or chiropractor

) suspects.
There isn't really a "liver test". There's about 7 of them at least.
- ALT
- AST
- ALP
- GGT
- Albumin
- INR
- Bilirubin
None of these are screening tests. They all test different components of liver function in roundabout ways (ie ALT/AST elevate with liver inflammation, INR is a measure of coagulation and the liver's ability to make clotting factors, bilirubin is a measure of jaundice, etc).
In general, the only one typically ordered randomly is ALT. I would've expected Nick's liver to be distressed enough to at least show SOME elevation, but it's also not the most sensitive test.
If he self-reported his drinking or the clinician suspected it, they would've added a GGT because this enzyme is the most sensitive for liver inflammation from recent alcohol use.
If his clinician suspects Nick is drinking as much as he is, they also probably screened him for Hep B and C to rule out other things that will hasten the cirrhosis.