Distributions of biomarkers in women before and at early gestation (pilot study)
| Biomarker | Preconception | Early pregnancy | ||
| n | Level | n | Level | |
| Serum folate (ng/mL), median (IQR) | 620 | 9.7 (6.5–13.8) | 577 | 14.5 (11.2–16.4) |
| Red blood cell folate (ng/mL), median (IQR) | 570 | 247.0 (184.8–340.5) | 587 | 417.4 (308.6–544.2) |
| Homocysteine (μmol/L), median (IQR) | 624 | 6.5 (5.2–8.6) | 599 | 4.2 (3.5–5.2) |
| Vitamin B12 (pg/mL), median (IQR) | 625 | 495.2 (394.2–639.0) | 600 | 388.5 (289.4–511.4) |
| Vitamin D (ng/mL), mean±SD | 607 | 16.3±6.0 | 578 | 15.5±6.1 |