Hello beahavan,
This change
2/22/18 ALT 19 AST 25
7/10/18 ALT 26 AST 32
is unremarkable. The remarkable thing is that your ALT/AST are so stable! We expect these values to wander:
https://aasldpubs.onlinelibrary.wiley.com/doi/full/10.1002/hep.22109?scrollTo=references
ALT released in the blood is catabolized in the liver with a resulting plasma half life of 47 ± 10 hours, which is considerably longer than that of AST (17 ± 5 hours).1 ALT activity varies day to day, by 10% to 30%. Within a given day, there is a significant diurnal variation, with ALT activities being up to 45% higher in the afternoon than in the early morning.
Did you perhaps have this blood draw in the afternoon?
I would suggest either repeating it in 2 weeks or doing a PCR to put your mind at ease.