Congenital Hypothyroidism: 8-Year Experience Using 2 Newborn Screens in Alabama.

Abstract:

BACKGROUND/AIMS:Newborn screening protocols for congenital hypothyroidism (CH) vary as to whether a TSH or T4 algorithm or some combination is performed. We aimed to determine the 3-year clinical outcome of infants diagnosed with CH and screen-positive for CH using a 2-screen protocol that measures both T4 and TSH on all specimens. METHODS:Retrospective analysis of patients with CH who were detected by first (NBS1) or second (NBS2) newborn screen in Alabama (2009-2016) and followed at our university-based practice. Clinical follow-up established the final diagnoses in 146 patients, including a subset of 72 patients with eutopic glands. RESULTS:168 patients were studied: 139 (83%) were detected by NBS1 and 29 (17%) by NBS2. Screening T4 concentrations were 45% reduced in NBS2 compared to NBS1 (p= 0.0002). Thyroid dysgenesis was present in 55% of NBS1 patients while all in NBS2 were eutopic. Follow-up of 146 patients confirmed permanent CH in 92 patients in NBS1 (75%) and 5 in NBS2 (20%). Hispanic infants were only detected by NBS1, and 93% had permanent CH. Transient CH was associated with congenital heart disease. In patients with eutopic, permanent CH, dyshormonogenesis was confirmed in 23% of NBS1 patients and 40% of NBS2. One case of central CH was detected by each screen. CONCLUSIONS:This 8-year, retrospective study buttresses the importance of a 2-screen approach for CH by identifying 5 infants with clinically significant permanent thyroid dysfunction including dyshormonogenesis and central hypothyroidism. It is the first 2-screen study to incorporate thyroid ultrasound. Disconcertingly, 4 of 5 second-screen infants with permanent CH had no risk factors for CH, and these infants would otherwise not have been detected.

journal_name

Horm Res Paediatr

authors

Pitts L,McCormick W,Mick GJ

doi

10.1159/000501395

subject

Has Abstract

pub_date

2019-01-01 00:00:00

pages

319-328

issue

5

eissn

1663-2818

issn

1663-2826

pii

000501395

journal_volume

91

pub_type

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