R-CHOPRituximab, Cyclophosphamide, Hydroxydaunomycin, Oncovin, Prednisone
R-EPOCHRituximab, Etoposide, Prednisolone, Oncovin, Cyclophosphamide, Hydroxydaunorubicin
rAAARuptured Abdominal Aortic Aneurysm
RACrecovery audit contractor
RAFRapidly Accelerated Fibrosarcoma
RANKreceptor activator of nuclear factor kappa-Β
RANKLReceptor activator of nuclear factor kappa-Β ligand
RANTESRegulated upon Activation, Normal T Cell Expressed and Presumably Secreted
RASresistance-associated substitution
RasGEFRas guanine nucleotide exchange factor
RBASradiosurgery-based AVM score
RBBBright bundle branch block
RBDreceptor binding domain
RC1replication factor complex subunit 1
RCMrefractory chronic migraine
RCTrandomized controlled trial
RCVPrituximab, cyclophosphamide, vincristine sulfate, prednisone
RCVSreversible cerebral vasoconstriction syndrome
RDFroof-dependent flutter
RDIrespiratory disturbance index
RdRpRNA-dependent RNA polymerase
RDSrespiratory distress syndrome
REBOCRadioembolization Brachytherapy Oncology Consortium
RECISTResponse Evaluation Criteria in Solid Tumors
REMSrisk evaluation and mitigation strategy
RERArespiratory-effort related arousal
RETURapid Evaluation and Treatment Unit
RFAradiofrequency ablation
RFFPradial forearm flap phalloplasty
RFPred fluorescent protein
RFVTAradiofrequency volumetric thermal ablation
rGBMrecurrent glioblastoma multiforme
rhAPCrecombinant human activated protein C
rhGHrecombinant human growth hormone
RICradiation-induced change
RICErest, ice, compression, elevation
RIMAright internal mammary artery
RIPCremote ischaemic preconditioning
RITLSRossetti Infant-Toddler Language Scale
RLFRetrolental Fibroplasia
RMSrelapsing multiple sclerosis
RNFLretinal nerve fiber layer
ROCreceiver operating characteristic
ROPESRepetitive Obstacle Performance Evaluation System
ROSAHretinal dystrophy, optic nerve edema, splenomegaly, anhidrosis and migraine headache
ROSCreturn of spontaneous circulation
RP PCRrespiratory polymerase chain reaction
RPEretinal pigment epithelium
RPLrecurrent pregnancy loss
RPLVright posterolateral ventricular branch
RPPRespiratory Pathogen Panel
RRRregular rate and rhythm
RRTrenal replacement therapy
rRT-PCRreal-time reverse transcriptase polymerase chain reaction
RSDreflex sympathetic dystrophy
RSVrespiratory syncytial virus
RT-PCRreverse transcription polymerase chain reaction
RTArenal tubular acidosis
RTCreplicase-transcriptase complex
RTKreceptor tyrosine kinase
rTMSrepetitive transcranial magnetic stimulation
RTOGRadiation Therapy Oncology Group
rUTIrecurrent urinary tract infection
RVEright ventricular enlargement
RVFWSRV free wall longitudinal systolic strain
RVPrespiratory viral panel
RVRrapid ventricular response
RVSPright ventricular systolic pressure
RWTRobotic Waterjet Treatment
RYGBRoux-en-Y gastric bypass