[Postpartum thyroiditis: risk factors, differential diagnosis, clinical features].

Area of Science:

• Endocrinology
• Reproductive Medicine
• Immunology

Context:

• Postpartum thyroiditis (PT) is a common cause of thyroid dysfunction after childbirth.
• Affecting approximately 5% of women, PT requires understanding its risk factors and clinical presentation.
• Distinguishing PT from other postpartum thyroid conditions like Graves' disease (GD) is crucial for accurate diagnosis.

Purpose:

• To investigate the risk factors and clinical features of postpartum thyroiditis (PT).
• To compare PT with postpartum Graves' disease (GD) and anti-thyroid peroxidase antibody (TPO-AB) carriers.
• To analyze diagnostic approaches and outcomes for different PT variants.

Summary:

• Patients with PT showed higher TPO-AB levels during pregnancy than controls.
• Postpartum GD presented later than PT, with higher free T4 and larger thyroid volume.
• Monophasic hypothyroid PT variant had higher TSH in early pregnancy and TPO-AB at diagnosis, often leading to persistent hypothyroidism.

Impact:

• Identifies elevated TPO-AB during pregnancy as a risk factor for PT.
• Differentiates PT from postpartum GD based on timing, T4 levels, and thyroid size.
• Highlights that biphasic PT has a higher recovery rate (90%) than monophasic PT (40% persistent hypothyroidism).