Normal folic acid levels in pregnancy

Nutrient	First trimester	Second trimester	Third trimester
Folate, red blood cell (ng/mL)	137 to 589	94 to 828	109 to 663
Folate, serum (ng/mL)	2.6 to 15.0	0.8 to 24.0	1.4 to 20.7

NOTE: The World Health Organization recommends a minimum red blood cell folate level of 400 ng/mL prior to conception and in the first trimester.

Data from: Abbassi-Ghanavati M, Greer LG, Cunningham FG. Pregnancy and laboratory studies: A reference table for clinicians. Obstet Gynecol 2009; 114:1326.

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Normal folic acid levels in pregnancy