Posted 10/18/2021 12:17 AM (GMT -8)
Serum folate is a short-term measure of blood levels of folate, and since it's short-term it can vary/fluctuate day-to-day depending on what is eaten.
RBC FOL is red blood cell folate, which is a longer-term measure of levels of folate. It has less day-to-day fluctuation than serum folate.
High levels are fine and aren't know to be a problem. They often indicate you're taking vitamins with folate or you're eating lots of foods enriched with folate.