CRT-Basic Life Support (BLS) - AHA American Heart Association Medical Group, Pennock, Spectrum Health Grand Rapids, Gerber, Continuing Care (except Hospice), Ludington, Reed City, United, Zeeland 90 Days required Or. CRT-Basic Life Support (BLS) - ARC American Red Cross Medical Group, Pennock, Spectrum Health Grand Rapids, Gerber, Continuing Care (except Hospice), Ludington, Reed City, United, Zeeland 90 Days required Or.