In 2017, the Maternal Fetal Medicine Units (MFMU) Network disseminated a Trial of Labor after Cesarean (TOLAC) calculator. An updated (2021) version of the calculator does not include race and ethnicity, but instead focuses on prior medical and OB history, in addition to age and BMI. The objective of this study was to compare the actual vs predicted VBAC rates between the old and new MFMU calculators.
