Table 1.
Prevalence of thyroid autoantibodies in pregnant women
| Thyroid autoantibodies | Trimester |
Total | ||
|---|---|---|---|---|
| First | Second | Third | ||
| TPO (+) | 12 (7.7) | 7 (4.6) | 9 (6.0) | 28 (6.1) |
| Tg (+) | 13 (8.4) | 4 (2.6) | 3 (2.0) | 20 (4.4) |
| TPO (+) and Tg (+) | 5 (3.2) | 1 (0.7) | 0 | 6 (1.3) |
| TPO (+) or Tg (+) | 20 (12.9) | 10 (6.5) | 12 (7.9) | 42 (9.2) |
| TPO (–) and Tg (–) | 135 (87.1) | 143 (93.5) | 139 (92.1) | 417 (90.8) |
Values are presented as number (%). Positivity of anti-TPO antibody and anti-Tg antibody was defined as plasma concentrations of 60 IU/mL or greater. Only subjects without anti-TPO antibody and anti-Tg antibody were included in the analysis of normal thyroid hormone reference intervals in pregnant women.
TPO, thyroid peroxidase; Tg, thyroglobulin.