folate level normal range

Testing the folate level, which is also known as folic acid and vitamin B9, is primarily used in the diagnosis of megaloblastic anemia.
The reference range of the plasma folate level varies by age, as follows^[1]:

• Adults: 2-20 ng/mL, or 4.5-45.3 nmol/L
• Children: 5-21 ng/mL, or 11.3-47.6 nmol/L
• Infants: 14-51 ng/mL, or 31.7-115.5 nmol/L

The reference range of the red blood cell (RBC) folate level also varies by age, as follows^[1] :

• Adults: 140-628 ng/mL, or 317-1422 nmol/L
• Children: Over 160 ng/mL, or over 362 nmol/L

http://emedicine.medscape.com/article/2085523-overview