Table 2. Open in new tab TSH and fT 4...

Table 2.

TSH and fT₄ Reference Intervals for Each Gestational Week in 6671 Healthy Danish Pregnant Women

Pregnancy Week	5	6	7	8	9	10	11	12	13	14	15–19
n	142	497	884	1193	1287	1006	690	448	221	140	163
TSH
2.5th percentile	0.69	0.57	0.32	0.20	0.13	0.061	0.066	0.093	0.10	0.14	0.24
Median	1.70	1.61	1.45	1.21	1.10	1.03	0.99	0.98	1.12	1.34	1.29
97.5th percentile	3.84	3.47	3.68	3.46	3.41	3.27	3.09	3.37	3.12	3.85	3.29
fT₄
2.5th percentile	11.52	11.58	11.74	11.88	11.87	12.07	12.02	11.84	11.61	11.23	11.52
Median	14.59	14.36	14.55	14.70	14.77	14.80	14.78	14.39	14.43	14.40	14.03
97.5th percentile	17.63	18.36	18.40	18.58	18.93	19.16	18.81	18.69	17.60	17.99	17.98

Pregnancy Week	5	6	7	8	9	10	11	12	13	14	15–19
n	142	497	884	1193	1287	1006	690	448	221	140	163
TSH
2.5th percentile	0.69	0.57	0.32	0.20	0.13	0.061	0.066	0.093	0.10	0.14	0.24
Median	1.70	1.61	1.45	1.21	1.10	1.03	0.99	0.98	1.12	1.34	1.29
97.5th percentile	3.84	3.47	3.68	3.46	3.41	3.27	3.09	3.37	3.12	3.85	3.29
fT₄
2.5th percentile	11.52	11.58	11.74	11.88	11.87	12.07	12.02	11.84	11.61	11.23	11.52
Median	14.59	14.36	14.55	14.70	14.77	14.80	14.78	14.39	14.43	14.40	14.03
97.5th percentile	17.63	18.36	18.40	18.58	18.93	19.16	18.81	18.69	17.60	17.99	17.98