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ORIGINAL ARTICLE
Year : 2018  |  Volume : 15  |  Issue : 3  |  Page : 117-121

Trimester-specific reference ranges for thyroid function tests in South Indian women


Department of Endocrinology, Narayana Medical College and Hospital, Nellore, Andhra Pradesh, India

Correspondence Address:
Dr. Vijaya Sarathi
Department of Endocrinology, Narayana Medical College and Hospital, Nellore - 524 003, Andhra Pradesh
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/trp.trp_24_18

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Background: There are no published data on trimester-specific reference intervals for thyroid function tests (TFTs) in south Indian pregnant women. Hence, this study was conducted to establish trimester-specific reference intervals for TFTs in south Indian pregnant women. Materials and Methods: This is a cross-sectional study conducted at a tertiary health-care center at Coastal region from South India. A total of 235 healthy women of age >18 years with uncomplicated singleton, intrauterine pregnancy who were consuming iodized salt were recruited for the study. Family history of thyroid illness, history of abortion, goiter, antithyroid peroxidase positivity, overt hypothyroidism, and overt hyperthyroidism were present in 11 (4.7%), 27 (11.5%), 50 (21.3%), 15 (6.38%), 1 (0.42%), and 3 (1.28%) had, respectively, and a total of 73 participants having one of these features were excluded from the study. A total of 162 (I trimester: 47, II trimester: 50, and III trimester: 65) women were included in the analysis to derive trimester-specific reference ranges. Results: The reference ranges for the first, second, and third trimester were 0.08–2.24, 0.42–2.84, and 0.40–3.14 μIU/ml for thyroid-stimulating hormone, 0.68–1.44, 0.59–1.21, and 0.53–1.15 ng/dl for free thyroxine 4 (FT4) and 2.08–3.48, 1.81–3.81, and 1.86–3.38 pg/ml for FT3. Conclusion: Our study reports trimester-specific reference ranges for TFTs in south Indian women from a coastal region.


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