You should always try to sample and wait for results before taking action on an oil change. I get a feeling that the Lab would have recommended you run the oil longer, had you not changed it.
Good results in my option. 12k should be easy. I used to do 2x cycles of Honda's Maintenance Minder system with my 2014 Civic EX using Synthetic and all was well at 150k miles when it was crashed and totaled. I planned to take it to 250k with ease. Ran awesome.