Annual Percentage Rate 
April 
air-purifying respirator 
Annual Performance Report 
automatic pressure relief 
Accountability Progress Reporting 
acoustic paramagnetic resonance 
Agency Procurement Request 
Airborne Profile Recorder 
Automatic Power Reserve 
AUTOPRO 
abdominal perineal resection 
Acute phase response 
Advanced Parts Release 
Advanced Production Release 
Alternate Path Retry 
American Public Radio 
Annual Program Review 
Approval 
Area of Primary Responsibility 
assembly planning review 
abdominoperineal resection 
abdominoperineal resection of rectum 
abdominoperineal resections 
absolute production rate 
absolute proximal reabsorption 
absolute proximal reabsorption rate 
absolute proximal tubular reabsorption 
Academic Performance Report 
accessory planta retractor