"RPAO: routine post-anaesthetic observations"
"A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z - misc"
"ROC: receiver operating characteristic curve"
"R"
"Ra: radium"
"Rad: cgs unit of absorbed radiation dose"
"Rb: rubidium"
"R-BCS: repeat breast-conserving surgery"
"Rathke cleft cyst"
"R-CHOP: rituximab, cyclophosphamide, doxorubicin (hydroxydaunomycin), oncovin (vincristine), prednisolone"
"Rd: rutherford"
"RdRp: RNA-dependent RNA polymerase gene"
"Re: rhenium"
"ReA: reactive arthritis"
"Recons: reconstructions"
"Reg: registrar"
"Rem: roentgen equivalent man"
"Rems: radiofrequency echographic multispectrometry"
"Rep: roentgen equivalent physical"
"Resus: resuscitation"
"Rh"
"Rn: radon"
"R/O"
"RöFo: Fortschritte auf dem Gebiet der Röntgenstrahlen und der bildgebenden Verfahren"
"Royal Society of Medicine (UK)"
"Ru: ruthenium"
"Rx: prescription (originally, and strictly, ℞, shorthand for recipe, in Latin = take thou)"
"RA"
"RAA: right atrial appendage"
"RAAS: renin-angiotensin-aldosterone system"
"RACF: residential aged-care facility"
"RAD"
"RADU: renal artery doppler ultrasound"
"RAGE: Receptor for Advanced Glycation End-products"
"RAI: radioactive Iodine"
"RAI-R: radioactive iodine resistant"
"RAIR"
"RAL: remote afterloading (in radiotherapy)"
"RALP: robot-assisted laparoscopic prostatectomy"
"RAMC: Royal Army Medical Corps (UK)"
"RAMC: Royal Army Medical Corps (UK)"
"RANK: receptor activator of nuclear factor-Kappa B"
"RANO: response assessment in neuro-oncology"
"RANZCR: Royal Australian and New Zealand College of Radiologists"
"RAO: right anterior oblique"
"RAP: recurrent acute pancreatitis"
"RAPN: robot-assisted partial nephrectomy"
"RAR: renal-to-aortic ratio"
"RARP: robot-assisted radical prostatectomy"
"RAS"
"RAW: relapse-associated worsening"
"RAZ: right apical zone"
"RB: rectal balloon"
"RBBB: right bundle branch block"
"RBC: red blood cells"
"R-BCS: repeat breast-conserving surgery"
"RB-ILD: respiratory bronchiolitis-interstitial lung disease"
"RC: rotator cuff"
"RCA"
"RCC"
"RCCA: right common carotid artery"
"RCH: remote cerebellar haemorrhage"
"R-CHOP: rituximab, cyclophosphamide, doxorubicin (hydroxydaunomycin), oncovin (vincristine), prednisolone"
"RCJ: radiocarpal joint"
"RCL: radial collateral ligament complex of the elbow"
"RCM: restrictive cardiomyopathy"
"RCR: Royal College of Radiologists (UK)"
"RCR: Royal College of Radiologists (UK)"
"RCVS: reversible cerebral vasoconstriction syndrome"
"RD: resident doctor"
"RDC: rapid diagnostic centre"
"RDMQ: Roland-Morris Disability Questionnaire"
"RdRp: RNA-dependent RNA polymerase gene"
"RdRp: RNA-dependent RNA polymerase gene"
"RDS: respiratory distress syndrome"
"RDU: recreational drug use"
"RDW: red cell distribution width"
"RE: right eye"
"REBOA: resuscitative endovascular balloon occlusion of the aorta"
"REC: Research Ethics Committee"
"RECIBM: Response Evaluation Criteria in Bone Metastases"
"RECIST: Response Evaluation Criteria in Solid Tumours"
"RELN: reelin gene"
"RES"
"RF"
"RFA: radiofrequency ablation"
"RFB: rectal foreign body"
"RFID: radiofrequency identification"
"RF-MLA: random forest machine-learning algorithm (in fMRI)"
"RFT: right ventricular false tendon"
"RFTC: radiofrequency thermal coagulation"
"RGA: right gastric artery"
"RGEA: right gastroepiploic artery"
"RHA: right hepatic artery"
"RHC: right heart catheterisation"
"RHD"
"RHE: relative hepatic enhancement"
"RHS: right hand side"
"RHV: right hepatic vein"
"RI"
"RIDDLE: radiosensitivity, immunodeficiency, dysmorphic features and learning difficulties"
"RIF: right iliac fossa"
"RIFLE: Risk, Injury, Failure,Loss, End-stage kidney disease"
"RIG: radiologically inserted gastrostomy"
"RIGS: radioimmunoguided surgery"
"RIH: right inguinal hernia"
"RIHD: radiation-induced heart disease"
"RIJ: right internal jugular"
"RIJV: right internal jugular vein"
"RILD: radiation induced lung disease"
"RILD-SS: radiation induced lung disease-specific survival"
"RILI: radiation induced lung injury"
"RIMA: right internal mammary artery"
"RIPE: Rifampicin, Isoniazid, Pyrazinamide, and Ethambutol"
"RIRS: retrograde intrarenal surgery"
"RIS"
"RISEN: robust incomplete sequence estimation network"
"RITA: right internal thoracic artery"
"RK: right kidney"
"RL: Ringer's lactate"
"R-L: Right - Left"
"RLE: right lower extremity"
"RLL"
"RLN: recurrent laryngeal nerve"
"RLQ: right lower quadrant"
"RLT: radioligand therapy"
"RLZ: right lower zone"
"RMB: right main bronchus"
"RML: right middle lobe"
"RMO: resident medical officer"
"RMS"
"RMT: retromolar trigone"
"RMTA: Radiopharmaceutical Manufacturers and Theranostics Alliance"
"RMZ: right middle zone"
"RN: registered nurse"
"RNA: ribonucleic acid"
"RNFL: retinal nerve fibre layer"
"RNS: repetitive nerve stimulation"
"RO: right ovary"
"ROC: receiver operating characteristic curve"
"ROI: region of interest"
"ROLL: radioguided occult lesion localisation"
"ROM"
"ROP: retinopathy of prematurity"
"ROS"
"ROSC: return of spontaneous circulation"
"ROSE: rapid on-site evaluation"
"ROSIS: Radiation Oncology Safety Information System"
"ROTEM: rotational thromboelastometry"
"RP"
"RPA: right pulmonary artery"
"RPAO: routine post-anaesthetic observations"
"RPOC: retained products of conception"
"RPL: recurrent pregnancy loss"
"RPLND: retroperitoneal lymph node dissection"
"RPLS: reversible posterior leukoencephalopathy syndrome"
"RPP: radical perineal prostatectomy"
"RPS: retroperitoneal sarcoma"
"RPT: radiopharmaceutical therapy"
"RPW: relative percentage washout (adrenal CT washout)"
"RQS: radiomics quality score"
"RR: respiratory rate"
"RRA: right renal artery"
"RRMS: relapsing remitting multiple sclerosis"
"RRP: radical retropubic prostatectomy"
"RRR:"
"RRSD: Relative Risk Standard Deviation"
"RRT: renal replacement therapy"
"RS: respiratory system"
"RSBI: rapid shallow breathing index"
"RSCA: right subclavian artery"
"RSD: reflex sympathetic dystrophy"
"RSI"
"RSM"
"Royal Society of Medicine (UK)"
"RSNA: Radiological Society of North America"
"RSO: resident surgical officer"
"RSS: reflux symptom score"
"RSW: right-sided weakness"
"RSWP: radial-sided wrist pain"
"RSX: radiosurgery"
"RT"
"RTA"
"RTC: road traffic collision"
"RTT: return to theatre"
"RTI: respiratory tract infection"
"RTX"
"RUE: right upper extremity"
"RUL"
"RULM: Revised Upper Limb Module"
"RUO: right ureteric orifice"
"RUQ: right upper quadrant"
"RUZ: right upper zone"
"RUSH: rapid ultrasound in shock"
"RV"
"RVA: right vertebral artery"
"RVAD: right ventricular assist device"
"RVCL-S: retinal vasculopathy with cerebral leukoencephalopathy and systemic manifestations"
"RVD"
"RVF: right ventricular failure"
"RVGLS: right ventricular global longitudinal strain"
"RVH: right ventricular hypertrophy"
"RVOT: right ventricular outflow tract"
"RVR: rapid ventricular rate/response (in atrial fibrillation)"
"RVSD: right ventricular systolic dysfunction"
"RVSP: right ventricular systolic pressure"
"RVT: renal vein thrombosis"
"RWMA: regional wall motion abnormalities or regional wall motion abnormality"
"RAGE: Receptor for Advanced Glycation End-products"
"RAMC: Royal Army Medical Corps (UK)"
"RDMQ: Roland-Morris Disability Questionnaire"
"REC: Research Ethics Committee"
"RECIBM: Response Evaluation Criteria in Bone Metastases"
"RIFLE: Risk, Injury, Failure,Loss, End-stage kidney disease"
"RIPE: Rifampicin, Isoniazid, Pyrazinamide, and Ethambutol"
"RL: Ringer's lactate"
"R-L: Right - Left"
"RMTA: Radiopharmaceutical Manufacturers and Theranostics Alliance"
"ROSIS: Radiation Oncology Safety Information System"
"RRSD: Relative Risk Standard Deviation"
"RULM: Revised Upper Limb Module"