Table 1.

Clinical characteristics of infants with delayed TSH rise detected on newborn screening. Dash (—) indicates data not reported. Modified from [18].

	VLBW and ELBW	≥1500 grams
Number of cases	19	3
Gestational age, mean (weeks)	25.9	—
Birth weight, mean (grams)	790	—
Age at initial TSH elevation, mean (days)	22	25
Initial T4, mean (μg/dL)	4.7	8.1
Initial T4 < 5 μg/dL, n (%)	10 (52.6)	1 (33.3)
Peak TSH, mean (mIU/L)	62.28	26.05
Peak TSH > 40 mIU/L, n (%)	4 (21.1)	0 (0)
Peak TSH > 100 mIU/L, n (%)	3 (15.8)	0 (0)
Age at resolution, mean (days)	51.1	—