reduced course load与CPT/OPT

CPT/OPT的申请要求是full time student的身份在美国待够一学年(spring + fall)。比较好奇的是申请了reduced course load的那学期算是full time的学期吗？
还有就是rcl分为medical rcl(0-11 credits)和academic rcl(1-11 credits)，medical rcl也算full time吗？算的话是至少选1学分才算还是直接不选课都能算full time呀？
提前感谢各位大佬!