You should track when the patient’s MRI is scheduled and confer with the physician to determine if the patient meets the remaining MRI & post-MRI criteria and finish filling out the CSF accordingly. If the patient meets all eligibility criteria, then they should be randomized when they are called with their MRI results. The RA should coordinate with the physician so that they can be on hand when the call is made. First, confirm that the patient – after hearing their MRI results – still wants to participate and is willing to be randomized. If so, then randomize them as you normally would, using the REDCap randomization module, and inform the patient of what treatment group they are in.