Dictionary of Medical Acronyms & Abbreviations

[ R ]

• R  Behnken unit; Broadbent registration point; any chemical group [particularly an alfyl group]; a conjugative plasmid responsible for resistance to various elements; electrical resistance; in electrocardiography, the first positive deflection during the QRS complex [wave]; far point [Lat. remotum]; gas constant; organic radical; race; racemic; radioactive; radiology; radius; ramus; Rankine [scale]; rapid accelerator; rate; rate modulation [pacemaker]; ratio; reaction; Reaumur [scale]; receptor; rectal; rectified; red; registered trademark; regression coefficient; regular; regular insulin; regulator [gene]; rejection factor; relapse; relaxation; release [factor]; remission; remote; reperfusion; repressor; residual tumor [TNM (tumor-node-metastasis) classification]; residue; resistance; respiration; respiratory exchange ratio; respiratory quotient; response; responder; rest; restricted; reverse [banding]; rhythm; ribose; Rickettsia; right; Rinne [test]; roentgen; rough [colony]; rub
• R´  in electrocardiography, the second positive deflection during the QRS complex
• R+  Rinne test positive
• R1  first repeat
• R2  second repeat
• +R  Rinne test positive
• -R  Rinne test negative
• °R  degree on the Rankine scale; degree on the Reaumur scale
• R1, R2, R3, etc.  years of resident study
• r  correlation coefficient; density; radius; ratio; recombinant; regional; ribose; ribosomal; ring chromosome; roentgen; sample correlation coefficient
• r²  coefficient of determination
• ρ  see rho
• R0  residual tumor not assessed [TNM (tumor-node-metastasis) classification]
• R1  longitudinal relativity; small residual tumor [TNM (tumor-node-metastasis) classification]
• R2  large residual tumor [TNM (tumor-node-metastasis) classification]; transverse relativity
• RA  radial artery; radioactive; radiographic abstraction; radiographic absorptiometry; ragocyte; ragweed antigen; rapidly adapting [receptors]; reactive arthritis; reciprocal asymmetrical; refractory anemia; refractory ascites; regression analysis; renal artery; renin-angiotensin; repeat action; residual air; retinoic acid; rheumatoid arthritis; right angle; right arm; right atrium; right auricle; risk adjustment; risk assessment; rotation angiography; Roy adaptation [model]
• R_A  airway resistance
• Ra  access resistance; radial; radium; radius
• rA  riboadenylate
• ra  receptor antagonist
• RAA  renin-angiotensin-aldosterone [system]; right aortic arch; right atrial appendage
• RAAMC  Royal Australian Army Medical Corps
• RAAMI  Randomized Angiographic Trial of Alteplase in Myocardial Infarction; Rapid Administration of Alteplase in Myocardial Infarction [trial]
• RAAPI  resting ankle-arm pressure index
• RAAS  Randomized Angiotensin II Receptor Antagonist, Angiotensin-Converting Enzyme Inhibitor Study; renin-angiotensin-aldosterone system
• rAAV  recombinant adeno-associated virus
• RAB  remote afterloading brachytherapy
• Rab  rabbit
• RABA  rabbit antibladder antibody
• RAC  rabeprazole, amoxicillin, clarithromycin; Recombinant Deoxyribonucleic Acid [DNA] Advisory Committee; research appraisal checklist
• rac  racemate, racemic
• RACAT  rapid acquisition computed axial tomography
• RACC  receptor-activated calcium channel
• RACE  ramipril angiotensin-converting enzyme [ACE]; Ramipril Cardioprotective Evaluation [trial]; rapid amplification of complementary deoxyribonucleic acid [cDNA] ends; Rapid Assessment of Cardiac Enzymes
• RACGP  Royal Australian College of General Practitioners
• RACT  reasonably available control technology; research activity [UMLS]
• RACV  relative autonomic conduction velocity
• RAD  radial artery catheter; radiation absorbed dose; radical; radiography or radiographic; reactive airways disease; receptor affinity distribution; right atrium diameter; right axis deviation; roentgen administered dose
• Rad  radiology; radiotherapy; radium
• rad  radiation absorbed dose; radial; radian; radical; radius; root [Lat. radix]
• RADA  rosin amine-D-acetate
• RADAI  rheumatoid arthritis disease activity index
• RADAR  rapid assessment of disease activity in rheumatology
• RADC  Royal Army Dental Corps
• RADES  randomly amplified differentially expressed sequence
• RADES-PCR  randomly amplified differentially expressed sequence polymerase chain reaction [PCR]
• RADIANCE  Randomized Assessment of Digoxin on Inhibitors of Angiotensin-Converting Enzyme [ACE, study]
• RADIO  radiotherapy
• radiol  radiology
• RADIUS  Routine Antenatal Diagnostic Imaging with Ultrasound [trial]
• RadLV  radiation leukemia virus
• RADMOS  radiotherapy data management and organization system
• RADP  right acromiodorsoposterior
• RADS  reactive airways dysfunction syndrome; retrospective assessment of drug safety
• rad/s  rad per second; radian per second
• rad/s²  rad per second squared
• rad ther  radiation therapy
• RADTS  rabbit antidog thymus serum
• RADTT  radiation therapy technologist
• RADVIS  radiological visualization
• RAE  right atrial enlargement
• RAEB  refractory anemia with excess blasts
• RAEBiT, RAEB-T  refractory anemia with excess blasts in transformation
• RAEC  rat aortic endothelial cell; rate control vs electrical cardioversion
• RAEM  refractory anemia with excess myeloblasts
• RAF  repetitive atrial firing; rheumatoid arthritis factor
• RAFMS  Royal Air Force Medical Services
• RAFT  Recurrent Atrial Fibrillation Trial; Rythmol-SR Atrial Fibrillation Trial
• RAFW  right atrial free wall
• RAG  radioautography; ragweed; recombinase activating gene; recombination activating gene; [computer-assisted] risk assessment in genetics
• RAGE  rapid gradient echo; receptor for advanced glycosylation end-products
• Ragg  rheumatoid agglutinin
• RAH  regressing atypical histiocytosis; right atrial hypertrophy
• RAHM  randomly amplified hybridization microsatellite
• RAHO  rabbit antibody to human ovary
• RAHTG  rabbit antihuman thymocyte globulin
• RaHV  ranid herpesvirus
• RAI  radioactive iodine; radioactive isotope; resident assessment instrument; resting ankle index; right atrial inversion; right atrial involvement
• RAID  radioimmunodetection; radiolabeled antibody imaging; redundant array of independent disks; redundant array of inexpensive disks
• RAIS  reflection-absorption infrared spectroscopy
• RAITI  right atrial inversion time index
• RAIU  radioactive iodine uptake
• RALES  Randomized Aldactone Evaluation Study
• RALPH  renal-anal-lung-polydactylyhamartoblastoma [syndrome]
• RALT  routine admission laboratory tests
• RAM  random-access memory; rapid alternating movements; rectus abdominis muscle; rectus abdominis myocutaneous [flap]; reduced acquisition matrix; research aviation medicine; resistance-associated mutation; resource allocation methodology; right anterior measurement
• RAMEDIS  Rare Metabolic Diseases
• RAMC  Royal Army Medical Corps
• RAM-FAST  reduced acquisition matrix-Fourier acquired steady state
• RaMI  Ravenna Myocardial Infarction [trial]
• RAMIT  Ravenna Myocardial Infarction Trial
• RAMM  remote-access multidimensional microscopy
• RAMP  radioactive antigen microprecipitin; rate modulated pacing; right atrial mean pressure
• RAMPO  randomly amplified microsatellite polymorphism
• RAMR  risk-adjusted mortality rate
• RAMT  rabbit antimouse thymocyte; right atrial mobile thrombi
• RAN  random number; remote area nurse [Australia]; resident's admission notes
• RANA  rheumatoid arthritis nuclear antigen
• rANP  rat atrial natriuretic peptide
• RANTES  regulated on activation, T-cell expressed and secreted
• RANTTAS  Randomized Trial of Tirilazad in Acute Stroke
• RAO  right anterior oblique; right anterior occipital; rotational acetabular osteotomy
• RaONC  radiation oncology
• RAP  rapid atrial pacing; recurrent abdominal pain; regression-associated protein; renal artery pressure; resident assessment protocol; rheumatoid arthritis precipitin; ribonucleic acid [RNA] arbitrarily primed; right atrial pressure
• RAPD  randomly amplified polymorphic deoxyribonucleic acid [DNA]; relative afferent pupillary defect
• RAPDDIP  randomly amplified polymorphic deoxyribonucleic acid [DNA] for the diploid cases
• RAPDHAP  randomly amplified polymorphic deoxyribonucleic acid [DNA] for the haploid cases
• RAPID  Recombinant Plasminogen Activator Angiographic Phase II International Dose Finding Study; Regional Arizona Prehospital Infarction Diagnosis [study]; Reteplase Angiographic Patency International Dose-Ranging Study
• RAPK  reticulate acropigmentation of Kitamura
• RAPM  refractory anemia with partial myeloblastosis
• RAPO  rabbit antibody to pig ovary
• RAP-PCR  ribonucleic acid [RNA] arbitrarily primed polymerase chain reaction [PCR]
• RAPPORT  ReoPro in Acute Myocardial Infarction and Primary Percutaneous Transluminal Coronary Angioplasty Organization and Randomized Trial
• RAPS  Renfrew and Paisley Study; resident assessment protocols
• RAPs  radiologists, anesthesiologists, and pathologists
• RAPT  Ridogrel vs Aspirin Potency Trial
• RAR  rapidly adapting receptor; rat insulin receptor; retinoic acid receptor; right arm reclining; right arm recumbent
• RARA  retinoic acid receptor alpha
• RARB  retinoic acid receptor beta
• RARE  rapid acquisition with relaxation enhancement; retinoic acid response element
• RARG  retinoic acid receptor gamma
• RARLS  rabbit anti-rat lymphocyte serum
• RARS  refractory anemia with ring sideroblasts
• RARTS  rabbit anti-rat thymocyte serum
• RAS  radiologist aid system [digital mammography algorithm]; rapid atrial stimulation; recurrent aphthous stomatitis; reflex activating stimulus; reliability, availability, serviceability; remote access service; renal artery stenosis; renal artery stent; renin-angiotensin system; residency application service; reticular activating system; rheumatoid arthritis serum; rotational atherectomy system; Rokitansky-Aschoff sinus; routine analysis station
• RA-S  refractory anemia with ringed sideroblasts
• ras  retrovirus-associated DNA sequence
• RASE  rapid acquisition spin echo
• RASMC  rat aortic smooth muscle cell
• RASS  rheumatoid arthritis and Sjögren syndrome
• RAST  radioallergosorbent test
• RAT  repeat action tablet; rheumatoid arthritis test; right anterior trigone
• RATG  rabbit antithymocyte globulin
• RATHAS  rat thymus antiserum
• RATMAP  Rat Genome Database
• rAT-P  recombinant antitrypsin Pittsburgh
• RATx  radiation therapy
• RAU  radioactive uptake; remote access unit [telemedicine]
• RAV  rheumatoid arthritis virus; Rous-associated virus
• RAVC  retrograde atrioventricular conduction; Royal Army Veterinary Corps
• RAVES  Reduced Anticoagulation in Saphenous Vein Graft Stent [trial]; Reduced Anticoagulation Vein Graft Study
• RAVLT  Rey Auditory Verbal Learning Test
• RAW  right atrial wall
• Raw  airway resistance
• R_AW  airway resistance
• RAWP  Resource Allocation Working Party
• RAWTS  ribonucleic acid amplification with transcript sequencing
• RAZ  razoxane
• RB  broader semantic relationship [UMLS]; radial basis [imaging]; radiation burn; rating board; rebreathing; reticulate body; retinoblastoma; retrobulbar; right breast; right bronchus; right bundle; rigid bronchoscopy
• RB1  The RB1 Gene Mutation Database
• Rb  retinoblastoma
• RBA  relative binding affinity; rescue breathing apparatus; right basilar artery; right brachial artery; rose bengal antigen
• RBAC  role-based access control
• RBAP  repetitive bursts of action potential
• RbAP  retinoblastoma-associated protein
• RBAS  rostral basilar artery syndrome
• rBAT  related to b^0,+ amino acid transporter
• RBB  right bundle branch
• RBBB  right bundle-branch block
• RBBP  retinoblastoma binding protein
• RBBsB  right bundle-branch system block
• RBBx  right breast biopsy
• RBC  ranitidine bismuth citrate; red blood cell; red blood count
• rbc  red blood cell
• RBCA  risk-based corrective action
• RBC-ChE  red blood cell cholinesterase
• RBCD  right border cardiac dullness
• rBCG  recombinant bacille Calmette-Guerin [vaccine]
• RBCM  red blood cell mass
• RbCoV  rabbit coronavirus
• RBCV  red blood cell volume
• RBD  recurrent brief depression; relative biological dose; RNA binding domain; right border of dullness
• RBE  relative biologic effectiveness
• RBF  radial basis function; regional blood flow; regional bone mass; renal blood flow
• RBFN  radial basis function network
• RBG  red blue green [Doppler]
• RBI  radiographic baseline
• RBI-EM  rescaled block-iterative expectation maximization [algorithm]
• Rb Imp  rubber base impression
• RBL  rat basophilic leukemia; Reid baseline; retinoblastoma-like
• RBL-ILD  respiratory bronchiolitis with associated interstitial lung disease
• RBM  ribonucleic acid [RNA] binding motif
• rBM  reconstituted basement membrane
• RBN  retrobulbar neuritis
• RBNA  Royal British Nurses Association
• RBNN  recurrent backpropagation neural network
• RBOW  rupture of the bag of waters
• RBP  retinol-binding protein; riboflavin-binding protein
• RBPC  cellular retinol-binding protein
• RBPI  intestinal retinol-binding protein
• rBPI  recombinant bactericidal/permeability increasing [protein]
• RBR  risk-based response; rule-based reasoning
• RB-RB  right bundle to right bundle [depolarization]
• RBRVS  resource-based relative value scale
• RBS  random blood sugar; receptor binding site; remote [computer] backup service; Roberts syndrome; Rutherford backscattering
• RbSA  rabbit serum albumin
• RBSL  risk-based screening level
• RBST  rubber-band straightening transform
• rBST  recombinant bovine somatotropin