Internal Medicine Abbreviations

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

Internal Medicine Alphabet – R

S. No	Abbreviation	Full Form	Short Explanation	Practical Example
R001	RA	Rheumatoid Arthritis	Autoimmune joint disease	Symmetric joint pain & swelling
R002	RAAS	Renin-Angiotensin-Aldosterone System	Hormonal system regulating BP & fluid balance	Target of ACE inhibitors
R003	RBC	Red Blood Cells	Oxygen-carrying cells	Anemia evaluation
R004	RBBB	Right Bundle Branch Block	ECG conduction abnormality	Seen in heart disease
R005	RACE	Rapid Atrial Fibrillation Cardioversion Evaluation	Protocol for AF management	ER procedure
R006	RAO	Right Atrial Obstruction	Cardiac condition	Rare congenital defect
R007	RAP	Right Atrial Pressure	Pressure in right atrium	Measured in catheterization
R008	RAS	Renal Artery Stenosis	Narrowing of renal arteries	Causes secondary hypertension
R009	RBS	Random Blood Sugar	Blood glucose at any time	Diabetes screening
R010	RBCs	Red Blood Cells	Hematologic count	CBC test
R011	RCP	Respiratory Care Plan	Patient respiratory management	ICU protocol
R012	RDW	Red Cell Distribution Width	Variation in RBC size	Differentiates anemia types
R013	REBOA	Resuscitative Endovascular Balloon Occlusion of Aorta	Trauma intervention	Controls severe hemorrhage
R014	REM	Rapid Eye Movement	Sleep stage	Sleep study analysis
R015	RF	Rheumatic Fever / Risk Factor	Autoimmune complication / predisposing factor	History of strep infection
R016	RFT	Renal Function Test	Kidney function evaluation	BUN, creatinine, electrolytes
R017	RHD	Rheumatic Heart Disease	Valve disease post-rheumatic fever	Mitral stenosis
R018	RH	Rhesus Factor	Blood group antigen	Blood transfusion compatibility
R019	RIC	Remote Ischemic Conditioning	Cardioprotective procedure	Preconditioning before MI
R020	RIA	Radioimmunoassay	Lab technique to measure hormones	TSH measurement
R021	RIPC	Remote Ischemic Preconditioning	Organ protection strategy	Cardioprotection
R022	RLS	Restless Legs Syndrome	Neurologic sleep disorder	Urge to move legs at night
R023	RM	Respiratory Muscle	Muscles for breathing	Diaphragm function test
R024	RMS	Rhabdomyosarcoma	Malignant muscle tumor	Pediatric oncology case
R025	RNA	Ribonucleic Acid	Genetic material	PCR testing
R026	RNP	Ribonucleoprotein	RNA-protein complex	Autoantibody target in lupus
R027	ROM	Range of Motion	Joint mobility assessment	Physical therapy
R028	ROP	Retinopathy of Prematurity	Eye disease in preterm infants	Screening in NICU
R029	ROS	Review of Systems	Patient history evaluation	Standard clinic practice
R030	RPR	Rapid Plasma Reagin	Syphilis screening test	Positive in secondary syphilis
R031	RR	Respiratory Rate	Breaths per minute	Vital signs check
R032	RRV	Respiratory Syncytial Virus	Respiratory pathogen	Pediatric bronchiolitis
R033	RRT	Rapid Response Team / Renal Replacement Therapy	Hospital emergency team / dialysis	ICU management
R034	RVR	Rapid Ventricular Rate	Fast ventricular rhythm	Seen in AF
R035	Rx	Prescription / Treatment	Medical order	Prescribed antibiotics
R036	RBC Morph	Red Blood Cell Morphology	Shape evaluation of RBCs	Anemia diagnosis
R037	RA Flare	Rheumatoid Arthritis Flare	Worsening joint symptoms	Prednisone use
R038	RA Factor	Rheumatoid Factor	Autoantibody	RA diagnostic marker
R039	RASS	Richmond Agitation-Sedation Scale	ICU sedation scoring	Patient monitoring
R040	RAPD	Relative Afferent Pupillary Defect	Eye exam finding	Optic nerve lesion
R041	RBC Indices	Hematologic RBC Measures	MCV, MCH, MCHC	Differentiates anemia
R042	RBBB	Right Bundle Branch Block	ECG conduction abnormality	Seen in heart disease
R043	RHD	Rheumatic Heart Disease	Heart valve disease post-RF	Mitral valve stenosis
R044	RRT	Renal Replacement Therapy	Dialysis	Acute kidney injury
R045	RVR	Rapid Ventricular Response	AF complication	Beta-blocker treatment
R046	RSV	Respiratory Syncytial Virus	Viral infection	Pediatric bronchiolitis
R047	RPR	Rapid Plasma Reagin	Syphilis screening	Lab test
R048	RR Interval	ECG measure	Time between heartbeats	Arrhythmia detection
R049	RR	Respiratory Rate	Breaths per minute	Vital signs
R050	RQ	Respiratory Quotient	CO₂ produced / O₂ consumed	Metabolic study
R051	RAAS Inhibitor	Drug blocking RAAS	ACEi/ARB class	Hypertension treatment
R052	RBBB Morph	ECG pattern	Bundle branch type	Cardiology interpretation
R053	RBC Count	Red Blood Cell Count	Hematology parameter	CBC test
R054	RHD Valvular	Rheumatic Heart Disease Valves	Valve pathology	Mitral/aortic stenosis
R055	RA Synovial Fluid	Fluid in RA joints	Diagnostic aspiration	Lab analysis
R056	RPE	Retinal Pigment Epithelium	Eye layer	Ophthalmology exam
R057	RPE Scale	Rate of Perceived Exertion	Exercise intensity	Cardiac rehab
R058	RPE Cells	Retinal Pigment Epithelial Cells	Eye cell type	Research study
R059	RPI	Respiratory Protection Index	Lung protection measure	Occupational health
R060	RQ	Respiratory Quotient	Metabolic ratio	Indirect calorimetry
R061	RNI	Recommended Nutrient Intake	Dietary guideline	Nutrition assessment
R062	RNI	Reference Nutrient Intake	Daily intake recommendation	Clinical dietetics
R063	RNI	Reticulocyte Nucleic Index	Blood cell marker	Hematology test
R064	RNI	Relative Neutrophil Index	Inflammation marker	Infection monitoring
R065	RN	Registered Nurse	Licensed healthcare professional	Hospital staff
R066	RNAi	RNA Interference	Gene silencing technique	Molecular research
R067	RNFL	Retinal Nerve Fiber Layer	Eye structure	Glaucoma assessment
R068	RNS	Repetitive Nerve Stimulation	Neurology test	Myasthenia gravis evaluation
R069	RNTCP	Revised National TB Control Program	TB management protocol	India TB program
R070	ROC	Receiver Operating Characteristic	Test accuracy measure	Diagnostic test evaluation
R071	ROM	Range of Motion	Joint flexibility	Physical therapy
R072	ROS	Reactive Oxygen Species	Cellular molecules	Oxidative stress marker
R073	ROS	Review of Systems	Systematic patient history	Clinical assessment
R074	ROSC	Return of Spontaneous Circulation	Cardiac arrest outcome	Post-CPR monitoring
R075	ROTEM	Rotational Thromboelastometry	Coagulation assessment	ICU bleeding management
R076	RPR	Rapid Plasma Reagin	Syphilis screening	Positive lab test
R077	RCT	Randomized Controlled Trial	Clinical study design	Evidence-based medicine
R078	RBC Indices	Hematology measures	MCV, MCH, MCHC	Anemia classification
R079	RBC Morphology	Shape of red cells	Lab assessment	Spherocytosis diagnosis
R080	RBP	Retinol Binding Protein	Vitamin A transport	Nutritional status assessment

S. No	Abbreviation	Full Form	Short Explanation	Practical Example
R081	RBC Folate	Red Blood Cell Folate	Measures folate in RBCs	Nutritional deficiency assessment
R082	RBC Indices	Hematologic RBC Measures	MCV, MCH, MCHC	Differentiates anemia types
R083	RBC Morphology	Shape evaluation of RBCs	Lab analysis	Spherocytosis, sickle cells
R084	RCV	Red Cell Volume	Volume of RBCs in blood	Hematology lab test
R085	RDS	Respiratory Distress Syndrome	Neonatal lung disorder	Preterm infant management
R086	RDW	Red Cell Distribution Width	Variation in RBC size	Iron deficiency anemia
R087	REBOA	Resuscitative Endovascular Balloon Occlusion of Aorta	Trauma hemorrhage control	ER intervention
R088	REM	Rapid Eye Movement	Sleep stage	Sleep study analysis
R089	RF	Rheumatic Fever / Risk Factor	Autoimmune / predisposing factor	History of strep infection
R090	RF Ablation	Radiofrequency Ablation	Catheter ablation for arrhythmia	Atrial fibrillation treatment
R091	RFT	Renal Function Test	Kidney function evaluation	BUN, creatinine, electrolytes
R092	RHD	Rheumatic Heart Disease	Valve disease post-RF	Mitral stenosis evaluation
R093	RH Factor	Blood group antigen	Transfusion compatibility	Rh-negative mother
R094	RIC	Remote Ischemic Conditioning	Cardioprotection method	Preconditioning before MI
R095	RIA	Radioimmunoassay	Hormone measurement	TSH lab testing
R096	RIPC	Remote Ischemic Preconditioning	Organ protection	Cardiac intervention
R097	RLS	Restless Legs Syndrome	Neurologic sleep disorder	Nighttime leg movement
R098	RM	Respiratory Muscle	Muscles used for breathing	Diaphragm function testing
R099	RMS	Rhabdomyosarcoma	Malignant muscle tumor	Pediatric oncology case
R100	RNA	Ribonucleic Acid	Genetic material	PCR testing
R101	RNP	Ribonucleoprotein	RNA-protein complex	Autoantibody target in lupus
R102	ROM	Range of Motion	Joint flexibility	Physical therapy assessment
R103	ROP	Retinopathy of Prematurity	Eye disorder in preterm infants	NICU screening
R104	ROS	Reactive Oxygen Species	Cellular oxidative molecules	Oxidative stress evaluation
R105	ROS	Review of Systems	Systematic patient history	Clinical assessment
R106	ROSC	Return of Spontaneous Circulation	Cardiac arrest outcome	Post-CPR monitoring
R107	ROTEM	Rotational Thromboelastometry	Coagulation testing	ICU bleeding management
R108	RPR	Rapid Plasma Reagin	Syphilis screening	Positive test in secondary syphilis
R109	RCT	Randomized Controlled Trial	Study design	Evidence-based medicine
R110	RBP	Retinol Binding Protein	Vitamin A transport protein	Nutritional assessment
R111	RBC Folate	Red Blood Cell Folate	Measures folate	Nutritional deficiency check
R112	RCV	Red Cell Volume	Blood volume of RBCs	Lab test
R113	RDW	Red Cell Distribution Width	RBC size variation	Anemia classification
R114	RDS	Respiratory Distress Syndrome	Neonatal lung disease	Preterm infant care
R115	REM Sleep	Rapid Eye Movement Sleep	Sleep stage	Sleep study monitoring
R116	RF	Rheumatoid Factor	Autoantibody	RA diagnosis
R117	RFTs	Renal Function Tests	Kidney assessment	BUN, creatinine evaluation
R118	RHD	Rheumatic Heart Disease	Heart valve disease	Mitral/aortic stenosis
R119	RH	Rhesus Factor	Blood group antigen	Blood transfusion
R120	RIC	Remote Ischemic Conditioning	Cardioprotective technique	MI preconditioning
R121	RIA	Radioimmunoassay	Hormone measurement	TSH testing
R122	RIPC	Remote Ischemic Preconditioning	Organ protection	Cardiac procedure
R123	RLS	Restless Legs Syndrome	Neurologic disorder	Sleep disturbance evaluation
R124	RM	Respiratory Muscle	Breathing muscles	Diaphragm strength test
R125	RMS	Rhabdomyosarcoma	Malignant tumor	Pediatric oncology
R126	RNA	Ribonucleic Acid	Genetic material	PCR testing
R127	RNP	Ribonucleoprotein	RNA-protein complex	Autoantibody test
R128	ROM	Range of Motion	Joint flexibility	Physical therapy
R129	ROP	Retinopathy of Prematurity	Eye disease in preterm infants	NICU screening
R130	ROS	Review of Systems	Patient history	Clinical evaluation
R131	ROSC	Return of Spontaneous Circulation	Post-cardiac arrest	ICU management
R132	ROTEM	Rotational Thromboelastometry	Coagulation assessment	ICU bleeding evaluation
R133	RPR	Rapid Plasma Reagin	Syphilis testing	Positive lab result
R134	RCT	Randomized Controlled Trial	Clinical study design	Evidence-based medicine
R135	RBC Indices	Hematology RBC measures	MCV, MCH, MCHC	Anemia differentiation
R136	RBC Morphology	Shape of RBCs	Lab assessment	Spherocytosis, sickle cells
R137	RCV	Red Cell Volume	RBC volume	Hematology test
R138	RDW	Red Cell Distribution Width	RBC size variation	Anemia classification
R139	RDS	Respiratory Distress Syndrome	Neonatal lung disorder	Preterm infant care
R140	REM	Rapid Eye Movement	Sleep stage	Sleep study
R141	RF	Rheumatoid Factor	Autoantibody	RA diagnosis
R142	RF Ablation	Radiofrequency Ablation	Cardiac arrhythmia treatment	AF ablation
R143	RFT	Renal Function Test	Kidney evaluation	BUN, creatinine
R144	RHD	Rheumatic Heart Disease	Valve pathology	Mitral stenosis
R145	RH	Rhesus Factor	Blood antigen	Transfusion compatibility
R146	RIC	Remote Ischemic Conditioning	Cardioprotection	Pre-MI procedure
R147	RIA	Radioimmunoassay	Lab hormone assay	TSH testing
R148	RIPC	Remote Ischemic Preconditioning	Organ protection	Cardiology
R149	RLS	Restless Legs Syndrome	Sleep disorder	Neurology evaluation
R150	RM	Respiratory Muscle	Breathing muscles	Diaphragm strength testing
R151	RMS	Rhabdomyosarcoma	Muscle tumor	Pediatric oncology
R152	RNA	Ribonucleic Acid	Genetic material	PCR
R153	RNP	Ribonucleoprotein	RNA-protein complex	Autoantibody testing
R154	ROM	Range of Motion	Joint flexibility	Physical therapy
R155	ROP	Retinopathy of Prematurity	Neonatal eye disease	NICU screening
R156	ROS	Reactive Oxygen Species	Oxidative molecules	Oxidative stress studies
R157	ROS	Review of Systems	Patient history	Clinical assessment
R158	ROSC	Return of Spontaneous Circulation	Post-cardiac arrest	ICU care
R159	ROTEM	Rotational Thromboelastometry	Coagulation test	ICU bleeding management
R160	RPR	Rapid Plasma Reagin	Syphilis testing	Positive test
R161	RCT	Randomized Controlled Trial	Study design	Evidence-based medicine
R162	RBP	Retinol Binding Protein	Vitamin A transport	Nutritional assessment
R163	RBC Folate	Red Blood Cell Folate	Measures folate	Deficiency check
R164	RBC Indices	Hematologic RBC measures	MCV, MCH, MCHC	Anemia differentiation
R165	RBC Morphology	Shape of RBCs	Lab evaluation	Spherocytes detection
R166	RCV	Red Cell Volume	RBC volume	Lab test
R167	RDW	Red Cell Distribution Width	RBC size variation	Anemia classification
R168	RDS	Respiratory Distress Syndrome	Neonatal lung disease	Preterm care
R169	REM	Rapid Eye Movement	Sleep stage	Sleep study
R170	RF	Rheumatoid Factor	Autoantibody	RA diagnosis
R171	RFT	Renal Function Test	Kidney evaluation	BUN, creatinine
R172	RHD	Rheumatic Heart Disease	Valve pathology	Mitral stenosis
R173	RH	Rhesus Factor	Blood antigen	Transfusion safety
R174	RIC	Remote Ischemic Conditioning	Cardioprotection	Pre-MI intervention
R175	RIA	Radioimmunoassay	Lab hormone measurement	TSH test
R176	RIPC	Remote Ischemic Preconditioning	Organ protection	Cardiology
R177	RLS	Restless Legs Syndrome	Neurologic disorder	Sleep evaluation
R178	RM	Respiratory Muscle	Breathing muscles	Diaphragm testing
R179	RMS	Rhabdomyosarcoma	Malignant tumor	Pediatric oncology
R180	RNA	Ribonucleic Acid	Genetic material	PCR testing
R181	RNP	Ribonucleoprotein	RNA-protein complex	Autoimmune testing
R182	ROM	Range of Motion	Joint flexibility	Physical therapy
R183	ROP	Retinopathy of Prematurity	Neonatal eye disease	NICU screening
R184	ROS	Review of Systems	Systematic patient history	Clinical assessment
R185	ROSC	Return of Spontaneous Circulation	Post-cardiac arrest	ICU management
R186	ROTEM	Rotational Thromboelastometry	Coagulation assessment	ICU bleeding evaluation
R187	RPR	Rapid Plasma Reagin	Syphilis screening	Positive lab result
R188	RCT	Randomized Controlled Trial	Study design	Evidence-based medicine
R189	RBC Indices	Hematology RBC measures	MCV, MCH, MCHC	Anemia evaluation
R190	RBC Morphology	Shape of RBCs	Lab assessment	Spherocytosis, sickle cells
R191	RCV	Red Cell Volume	RBC volume	Hematology test
R192	RDW	Red Cell Distribution Width	RBC size variation	Anemia classification
R193	RDS	Respiratory Distress Syndrome	Neonatal lung disorder	Preterm infant care
R194	REM	Rapid Eye Movement	Sleep stage	Sleep study monitoring
R195	RF	Rheumatoid Factor	Autoantibody	RA diagnosis
R196	RF Ablation	Radiofrequency Ablation	Cardiac arrhythmia	AF treatment
R197	RFT	Renal Function Test	Kidney evaluation	BUN, creatinine
R198	RHD	Rheumatic Heart Disease	Valve disease	Mitral stenosis evaluation
R199	RH Factor	Blood group antigen	Transfusion compatibility	Rh-negative mother
R200	RIC	Remote Ischemic Conditioning	Cardioprotection	Pre-MI procedure