Table 4.

TSH reference ranges of preterm infants at PMA 36 weeks in previous studies.

GA, weeks	No. of cases (n)	TSH value (μIU/ml)	Percentile
<32	1,093	12.3	97.5th
22–2718	1,022	13	99th
28–3118	2,115	13	99th
25–3619	120	12	Single reference range
26–3612	247	12.53	Single reference range

GA, gestational age; TSH, thyrotropin

The above figures (12, 18, 19) represent the corresponding references in the Reference.