Table II.
Potential for misclassification of TSH in pregnant women using non-pregnant reference intervals
| Gestation | N | Misdiagnosis | Missed diagnosis | Overall | |||
|---|---|---|---|---|---|---|---|
| n (%) | Pregnancy complication, n (%) | n (%) | Pregnancy complication, n (%) | n (%) | Pregnancy complication, n (%) | ||
| 1st trimester | 458 | 134 (29.3) | 13 (9.7) | 8 (1.7) | 2 (25.0) | 142 (31.0) | 15 (10.6) |
| 2nd trimester | 449 | 69 (15.4) | 4 (5.8) | 13 (2.9) | 6 (46.2) | 82 (18.3) | 10 (12.2) |
| 3rd trimester | 837 | 49 (5.9) | 6 (12.2) | 2 (0.2) | 0 | 51 (6.1) | 6 (11.8) |
| Total | 1744 | 252 (14.4) | 23 (9.1) | 23 (1.3) | 8 (34.8) | 275 (15.8) | 31 (11.3) |