Chattrakoonphong, S. , Kongsomboon, K. and Hanprasertpong, T. 2025. Rate of Re-dating after Determination of Gestational Age using Ultrasonography in Clinically Reliable and Clinically Non-reliable Pregnant Women during the First Trimester . Thai Journal of Obstetrics and Gynaecology. 33, 2 (Mar. 2025), 161–170. DOI:https://doi.org/10.14456/tjog.2025.17.