Full Time Student Qualification

My 19 year old son was attending college full time as of March 2020.  Then COVID Lockdown hit and he wasn't able to finish the semester because there were no in-person classes.  He could not finish on-line because it was considered a Lab type class (he needed the equipment at school) to complete the course.  Can he still be considered a "full-time" student for that semester?  I'm trying to establish myself as "Head of Household" with a full-time student as my qualifying child.