Comparisons of cumulative live birth rates after embryo transfers at day 2/3 versus day 5/6: a French national study.

Research Question: Are there significant differences between cumulative live birth rates (CLBR) after short or extended embryo culture when comparisons are performed per cycle?

Design: This French national study included all IVF cycles performed from January 2016 to December 2019 with at least one cleaved embryo at day 2. The day 2/3 and day 5/6 groups were identified using the National Biomedicine Agency register. Only attempts involving the vitrification method were included.

Autoimmune alternating hyper- and hypo-thyroidism: a rare condition in pediatrics.

Unlabelled: Alternating between hyper- and hypo-thyroidism may be explained by the simultaneous presence of both types of TSH receptor autoantibodies (TRAbs) - thyroid stimulating autoantibodies (TSAbs) and TSH blocking autoantibodies (TBAbs). It is a very rare condition, particulary in the pediatric age. The clinical state of these patients is determined by the balance between TSAbs and TBAbs and can change over time.