Preclinical Assessment Performance as a Predictor of USMLE Step 1 Scores or Passing Status.

Scores on faculty-derived and NBME CAS end-of-block assessments were positively correlated with Step 1 scores. Passing status on institution-derived end-of-block assessments was associated with passing Step 1, whereas passing status on weekly institution-derived assessments or end-of-block NBME CAS assessments was not associated with passing Step 1. End-of-block pass/fail NBME CAS and faculty-derived preclinical examinations may help prepare students for Step 1 and predict their outcomes. Weekly faculty-created assessments should primarily be used to continuously reinforce educational material.