Indications of over- and undertreatment of hypothyroidism in primary care: a scoping review and evidence mapping.

INTRODUCTION

Hypothyroidism is a prevalent endocrine disorder predominantly managed in primary care. Improper treatment can lead to significant clinical and public health consequences. Despite the availability of clear clinical guidelines, over- and undertreatment frequently occur. The aim was to explore and map indications of over- and undertreatment of hypothyroidism in a primary care setting.

METHODS

We conducted a scoping review guided by Arksey and O'Malley. The search was conducted in PubMed, Embase, CINAHL, Scopus, and the Cochrane Library. We included peer-reviewed studies exploring over- and undertreatment of hypothyroidism in primary care and included both registry/audit and survey studies. Data were extracted across four structured stages, capturing study characteristics and treatment-related outcomes. Data on indications were compared across studies to identify recurring patterns.

RESULTS

Nineteen studies were included. The findings show that the majority of studies with larger study populations report a moderate prevalence of over- and undertreatment. Overtreatment was associated with early initiation of therapy, absence of confirmatory testing, and suppressed TSH levels during follow-up. Undertreatment was linked to incomplete diagnostic evaluation, delayed treatment initiation, and inadequate follow-up. Survey studies reported similar patterns of inappropriate management but higher adherence to clinical guidelines.

CONCLUSION

This scoping review found consistent evidence of both over- and undertreatment of hypothyroidism in primary care. A discrepancy between clinicians' reported intentions and observed practice suggests the need to attend to behavioural and organisational factors, and to provide greater support for individualised decision-making to improve care.