Anti-Thyroperoxidase Antibody Levels >500 IU/ml Indicate a Moderately Increased Risk for Developing Hypothyroidism in Autoimmune Thyroiditis

M. Ehlers; A-L. Jordan; J. Feldkamp; R. Fritzen; B. Quadbeck; M. Haase; S. Allelein; C. Schmid; M. Schott

doi:10.1055/s-0042-112815

Hormone and Metabolic Research, Inhaltsverzeichnis

Horm Metab Res 2016; 48(10): 623-629
DOI: 10.1055/s-0042-112815

Endocrine Care

Anti-Thyroperoxidase Antibody Levels >500 IU/ml Indicate a Moderately Increased Risk for Developing Hypothyroidism in Autoimmune Thyroiditis

M. Ehlers^*

¹Division for Specific Endocrinology, Medical Faculty, University of Duesseldorf, Duesseldorf, Germany

,

A-L. Jordan^*

¹Division for Specific Endocrinology, Medical Faculty, University of Duesseldorf, Duesseldorf, Germany

,

J. Feldkamp

²Department for Endocrinology and Diabetes, Municipal Hospital Bielefeld, Bielefeld, Germany

,

R. Fritzen

³Outpatient Clinic for Endocrinology, Aachener Platz, Duesseldorf, Germany

,

B. Quadbeck

⁴Outpatient Clinic for Endocrinology, Duesseldorf, Germany

,

M. Haase

¹Division for Specific Endocrinology, Medical Faculty, University of Duesseldorf, Duesseldorf, Germany

,

S. Allelein

¹Division for Specific Endocrinology, Medical Faculty, University of Duesseldorf, Duesseldorf, Germany

,

C. Schmid

¹Division for Specific Endocrinology, Medical Faculty, University of Duesseldorf, Duesseldorf, Germany

,

M. Schott

¹Division for Specific Endocrinology, Medical Faculty, University of Duesseldorf, Duesseldorf, Germany

› Institutsangaben

Abstract

Autoimmune Thyroiditis (AIT) is the most common autoimmune disease, which is characterized by cellular and humoral immunity leading to thyroid destruction. The impact of the humoral immunity on the risk to develop hypothyroidism has not exactly been defined yet. The aim of the present study was to investigate the association between thyroid antibody levels and the risk for developing hypothyroidism. In this retrospective study, 335 untreated AIT patients were enrolled. Anti-thyroperoxidase (TPO) antibodies, anti-thyroglobulin (Tg) antibodies (Abs), and the TSH level were measured. Patients with TPO-Ab levels>500 IU/ml showed a moderately increased risk of having elevated TSH levels [p=0.0023; relative risk (95% confidence interval): 1.343 (1.108–1.627)] compared to those below this threshold. AIT patients with TPO- or Tg-Abs<100 IU/ml and between 100–500 IU/ml had no significantly different TSH levels. Presence of Tg-Abs alone or in combination with TPO-Abs did not help to increase the sensitivity to identify patients at risk. Long term follow-up of AIT patients with high TPO-Abs level (>500 IU/ml) showed an increase of TSH levels (mean: 0.5 mIU/l; range: 2.52±2.73 to 3.02±3.05 mIU/l; p=0.0420). Still, these patients remained euthyroid. Our data indicate largely elevated levels of TPO-Abs being associated with a moderately increased risk of developing hypothyroidism.

Key words

antibodies - thyroglobulin - thyroid stimulating hormone

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Referenzen

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