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Table 2 Mean red cell folate (μg/L), total serum folate (μg/L) and unmetabolised folic acid (μg/L) concentrations at week-14 (n = 19).

From: Folic acid fortification and public health: Report on threshold doses above which unmetabolised folic acid appear in serum

Subjects Serum folate Red cell folate Folic acid
Mean 14.77 693.94 0.21
SD 5.01 198.72 0.16
CI (95%) 12.38 – 19.22 434.87 – 903.49 0.29 – 0.52
  1. This table illustrates mean red cell folate (μg/L), total serum folate and unmetabolised folic acid (μg/L) concentrations after consuming a 400 μg folic acid supplement daily for 14 weeks (n = 19). 6 subjects had detectable folic acid levels (>0.312 μg/L).
  2. Normal reference range for red cell folate is in the range of 150–1000 μg/L and for total serum folate is 2.7–20 μg/L
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