A B12 level < 200 pg / mL (< 147.6 pmol / L), folate level < 2 ng / mL (< 4.53 nmol / L), or RBC folate level < 150 ng / mL (< 340 nmol / L) is generally diagnostic of deficiency.
A B12 < 200 pg / mL (< 147,6 pmol / L) hoặc folate < 2 ng / mL (< 4,53 nmol / L) thường là chẩn đoán thiếu hụt.