There is no single universal “ideal” folate number; interpretation depends on the lab method and reference range. So whether “4.8 is normal” depends on the unit (e.g., ng/mL vs nmol/L) and the reference interval printed on the report. High folate can simply reflect recent supplement use. The more strategic concern is missing vitamin B12 deficiency—especially if folate is high but B12 is low, which can create a misleading clinical picture. For accurate interpretation, review folate together with B12, a complete blood count, and symptoms.