I need a regex expression that will return a collection of phrases that are all caps ending in a colon. Example:

MEDICATIONS ON ADMISSION :Vasotec 40 mg q.day , Soma 1 tablet q.day , Demerolprn , Clonidine . ALLERGIES :The patient has no known drug allergies .PAST MEDICAL HISTORY :As described above .
FAMILY HISTORY :The family history is positive for diabetes mellitus , positive for cancer .

I need to extract the following:

MEDICATIONS ON ADMISSION, ALLERGIES, FAMILY HISTORY

Thanks.