Endocrine Case Capsule

Case of Twisted Neonatal Hypothyroidism

Introduction

This case is from Palanpur, where an 8-day-old newborn was referred for elevated TSH (35) and low FT4, raising suspicion of neonatal hypothyroidism. LT4 treatment was started after evaluation where mother was giving history of taking Thyroid medication for 50 Power.(Documents and Types of Tablet were not available with mother).On treatment, at day 28 of life, TSH was still high (27) but FT4 had normalized. Thyroid ultrasound showed normal thyroid tissue.

Learning Points

1. Thyroid screening is a birthright.  
Newborn thyroid screening should be done for every baby—it’s one of the most crucial parts of early life screening to prevent irreversible brain damage.

2. Interpretation needs clinical context.  
Always interpret thyroid results with supporting details—maternal thyroid history, gestational age, mode of delivery, USG/thyroid scan findings, and timing of sample collection.

3. Transient hypothyroidism has several causes. 
This includes:
- Maternal antibodies crossing the placenta (usually settle by 4–6 weeks)
- TSH receptor-blocking antibodies (effects may last ~3 months)

4. Regular follow-up is key.
In suspected neonatal hypothyroidism, frequent thyroid function tests are necessary. If the child maintains normal levels on very low or no LT4 doses, transient hypothyroidism should be considered.

Transient Hypothyroidism in the Newborn (AME Publishing)](https://tp.amegroups.org/article/view/16871/html)