Table 1 Median AFP, HCG and uE3 values and 95% confidence interval for gestational weeks 14–19.
| Gestational weeks | AFP in IU/ml (95% CI) | HCG in IU/ml (95% CI) | uE3 in nmol/l (95% CI) |
|---|---|---|---|
| 14 | 23.7 (21.4 to 25.8) | 39.0 (30.0 to 43.6) | 2.29 (1.99 to 2.41) |
| 15 | 24.8 (24.0 to 25.9) | 31.0 (29.0 to 33.0) | 2.67 (2.58 to 2.85) |
| 16 | 30.5 (27.6 to 31.8) | 27.0 (24.1 to 30.0) | 3.80 (3.62 to 4.00) |
| 17 | 36.0 (32.6 to 39.7) | 20.5 (18.3 to 24.4) | 4.68 (4.38 to 5.09) |
| 18 | 41.5 (36.8 to 44.8) | 16.1 (12.0 to 19.6) | 6.00 (4.99 to 6.85) |
| 19 | 45.3 (40.1 to 50.3) | 14.6 (11.3 to 23.0) | 7.05 (6.41 to 8.46) |
AFP, αfetoprotein; HCG, human chorionic gonadotropin; uE3, unconjugated oestriol.