reticular activating system
rapid atrial stimulation
recurrent aphthous stomatitis
Reliability, Availability, Serviceability
renal artery stenosis
renin-angiotensin system
Ribi adjuvant system
rabbit aortic strip
rabbit aortic strips
radiologist aid system
Radix Angelicae Sinensis
rapidly adapting afferents
rat aortic strips
rate of ankle swelling
Rathus Assertiveness Schedule
reality-adaptive, supportive
receptor antagonists
reflex activating stimulus
Registered Addiction Specialist
Relational Aggression Scale
relative aerobic strain
renal arterial stenosis
renal arteries
renal artery stenoses
renal artery stent
renin-aldosterone system
renin-angiotensin
renin-angiotensin systems
renin-angiotensin-aldosterone system
rennin-angiotensin system
residency application service
resin acids
retinoic acid syndrome
retinoic acids
retrovirus associated sequence
rheumatoid arthritis serum
Rhythmic auditory stimulation
right angle light scatter
ring sideroblasts
ringed sideroblasts