Internal Medicine Abbreviations

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Internal Medicine Alphabet – F

S. No	Abbreviation	Full Form	Short Explanation	Practical Example
F001	FAI	Femoroacetabular Impingement	Hip joint abnormality causing pain.	Seen in young athletes.
F002	FBC	Full Blood Count	Measures red cells, white cells, platelets.	Ordered for anemia screening.
F003	FBG	Fasting Blood Glucose	Blood sugar after overnight fast.	>126 mg/dL indicates diabetes.
F004	FBS	Fasting Blood Sugar	Same as FBG.	Used in diabetes diagnosis.
F005	FBP	Fibrinogen Breakdown Products	By-products of fibrin clot lysis.	Elevated in DIC.
F006	FEF	Forced Expiratory Flow	Pulmonary function test parameter.	Reduced in obstructive lung disease.
F007	FEIBA	Factor Eight Inhibitor Bypassing Activity	Coagulation product for hemophilia.	Used in bleeding episodes.
F008	FE	Fractional Excretion	Percentage of filtered solute excreted by kidney.	FE Na used to distinguish AKI causes.
F009	FEV1	Forced Expiratory Volume in 1 Second	Pulmonary function test metric.	Reduced in asthma/COPD.
F010	FFP	Fresh Frozen Plasma	Plasma product used in coagulopathy.	Given in liver disease bleeding.
F011	FGM	Flash Glucose Monitoring	Continuous glucose check by sensor.	Used in diabetic patients.
F012	FGR	Fetal Growth Restriction	Poor fetal growth due to placental issues.	Seen on obstetric ultrasound.
F013	FHF	Fulminant Hepatic Failure	Rapid liver failure with encephalopathy.	May require urgent transplant.
F014	FHH	Familial Hypocalciuric Hypercalcemia	Genetic cause of high calcium.	Differentiated from hyperparathyroidism.
F015	FHR	Fetal Heart Rate	Monitored during pregnancy.	Abnormal FHR indicates distress.
F016	FHT	Fetal Heart Tones	Sound of fetal heartbeat.	Checked via Doppler.
F017	FIB	Fibrinogen	Clotting factor I in blood.	Low in DIC.
F018	FID	Functional Iron Deficiency	Iron unavailable despite normal stores.	Seen in chronic disease anemia.
F019	FISH	Fluorescence In Situ Hybridization	Genetic test using fluorescent probes.	Detects chromosomal abnormalities.
F020	FIV	Feline Immunodeficiency Virus	Retrovirus in cats (relevant in zoonosis research).	Used in immunology studies.
F021	FLAIR	Fluid Attenuated Inversion Recovery	MRI sequence for brain imaging.	Used in multiple sclerosis.
F022	FLD	Fatty Liver Disease	Excess fat accumulation in liver.	Linked to obesity and diabetes.
F023	FLP	Fasting Lipid Profile	Test for cholesterol and triglycerides.	Used in CVD risk assessment.
F024	FLT3	FMS-Like Tyrosine Kinase 3	Mutation in acute myeloid leukemia.	Tested in oncology labs.
F025	FMD	Fibromuscular Dysplasia	Vascular disorder causing stenosis.	Seen in renal artery hypertension.
F026	FNA	Fine Needle Aspiration	Diagnostic procedure to collect cells.	Used in thyroid nodules.
F027	FNB	Femoral Nerve Block	Regional anesthesia technique.	Used in hip fracture surgeries.
F028	FND	Functional Neurological Disorder	Symptoms without structural disease.	Also called conversion disorder.
F029	FNH	Focal Nodular Hyperplasia	Benign liver lesion.	Incidental finding on imaging.
F030	FNP	Family Nurse Practitioner	Advanced practice registered nurse.	Provides primary care.
F031	FNS	Fetal Neurosonography	Advanced ultrasound for fetal brain.	Used in suspected CNS anomalies.
F032	FOBT	Fecal Occult Blood Test	Stool test for hidden blood.	Screening tool for colon cancer.
F033	FOD	Fatty Oxidation Disorder	Inherited metabolic disease.	Can cause hypoglycemia in children.
F034	FOI	Freedom of Information	Access to medical data regulations.	Used in patient record requests.
F035	FOL	Folate	Vitamin B9 essential for RBC formation.	Deficiency causes megaloblastic anemia.
F036	FOLFIRINOX	Chemo regimen (5-FU, Leucovorin, Irinotecan, Oxaliplatin)	Used in pancreatic cancer.	Administered in oncology wards.
F037	FOM	Floor of Mouth	Clinical area examined in oral medicine.	Cancers may arise here.
F038	FOS	Fosfomycin	Antibiotic used for urinary infections.	Single-dose treatment for cystitis.
F039	FOT	Forced Oscillation Technique	Lung function test.	Assesses airway resistance.
F040	FP	Family Practice	Medical specialty for general care.	Provides comprehensive outpatient care.
F041	FPG	Fasting Plasma Glucose	Equivalent to FBG.	Used in diabetes screening.
F042	FPL	Flexor Pollicis Longus	Thumb flexor muscle.	Tested in neuro exam.
F043	FPM	Family Planning Methods	Strategies to prevent pregnancy.	Includes IUDs, pills, condoms.
F044	FPP	Fibrinopeptide	Marker of fibrinogen activation.	Measured in clotting disorders.
F045	FQ	Fluoroquinolone	Antibiotic class (e.g., ciprofloxacin).	Used for urinary & respiratory infections.
F046	FR	Fibrinogen Receptor	Platelet receptor for clotting.	Target of antiplatelet drugs.
F047	FRAX	Fracture Risk Assessment Tool	Calculates fracture risk in osteoporosis.	Used with bone density tests.
F048	FRC	Functional Residual Capacity	Lung volume at end-expiration.	Reduced in restrictive lung disease.
F049	FRS	Framingham Risk Score	Tool to predict heart disease risk.	Used in preventive cardiology.
F050	FS	Fasting Sample	Blood drawn after fasting.	Used for glucose and lipid tests.
F051	FSH	Follicle-Stimulating Hormone	Pituitary hormone regulating reproduction.	Tested in infertility workup.
F052	FSHD	Facioscapulohumeral Dystrophy	Genetic muscle wasting disorder.	Progressive weakness in face and shoulders.
F053	FSS	Functional Somatic Syndrome	Physical symptoms with no clear cause.	Includes chronic fatigue syndrome.
F054	FST	Fasting Stress Test	Exercise tolerance test after fasting.	Used in cardiology.
F055	FTD	Frontotemporal Dementia	Neurodegenerative dementia.	Early personality and behavior changes.
F056	FTI	Free Thyroxine Index	Estimate of free thyroid hormone.	Used in thyroid disorder evaluation.
F057	FTN	Failure to Thrive	Poor growth in children.	Often due to malnutrition or disease.
F058	FTP	False True Positive	Diagnostic error classification.	Seen in screening test statistics.
F059	FTR	Failure to Rescue	Mortality after complication occurs.	Used as hospital quality indicator.
F060	FU	Follow-Up	Ongoing patient monitoring.	FU visit after discharge.
F061	FVC	Forced Vital Capacity	Pulmonary function measure.	Reduced in restrictive lung disease.
F062	FVIII	Factor VIII	Clotting factor deficient in hemophilia A.	Replacement therapy used.
F063	FXa	Factor Xa	Clotting enzyme in coagulation cascade.	Target of anticoagulants like rivaroxaban.
F064	FZD	Frizzled Receptor	Protein in Wnt signaling pathway.	Implicated in cancer biology.
F065	FAc	Fluocinolone Acetonide	Corticosteroid drug.	Used in eye implants for uveitis.
F066	FAD	Flavin Adenine Dinucleotide	Coenzyme in metabolic reactions.	Found in oxidative phosphorylation.
F067	FAP	Familial Adenomatous Polyposis	Inherited colon cancer syndrome.	Requires colonoscopy surveillance.
F068	FAR	Fatality Rate	Percentage of deaths in a disease.	COVID-19 FAR varied globally.
F069	FAS	Fetal Alcohol Syndrome	Congenital effects of alcohol exposure.	Causes growth retardation and facial anomalies.
F070	FASI	Focal Areas of Signal Intensity	MRI brain findings.	Seen in white matter disease.
F071	FAT	Free Air Test	Radiology test for pneumoperitoneum.	Detected in bowel perforation.
F072	FAU	Facial Artery Ultrasound	Imaging of facial blood flow.	Used in plastic surgery.
F073	FAV	Femoral Arteriovenous Fistula	Vascular access for dialysis.	Surgically created for hemodialysis.
F074	FBAO	Foreign Body Airway Obstruction	Blockage of airway by foreign object.	Heimlich maneuver used.
F075	FBCM	Full Blood Count with Morphology	Includes blood smear examination.	Used in anemia and leukemia.
F076	FBDS	Focal Brain Dysfunction Syndrome	Neurological impairment due to localized brain lesion.	Seen in brain tumors.
F077	FBLN	Fibulin Protein	Extracellular matrix protein.	Mutations linked to vascular disease.
F078	FBN	Fibrillin	Connective tissue protein.	Defective in Marfan syndrome.
F079	FBSL	Fasting Blood Sugar Level	Equivalent to FBG.	Used in endocrine practice.
F080	FBT	Functional Brain Tumor	Rare brain lesion classification.	Treated surgically.
F081	FCD	Focal Cortical Dysplasia	Abnormal brain development causing seizures.	Seen in refractory epilepsy.
F082	FCE	Feline Coronavirus Enteritis	Model for human coronavirus research.	Studied in infectious disease.
F083	FCL	Follicular Lymphoma	Type of non-Hodgkin lymphoma.	Treated with rituximab.
F084	FCP	Fecal Calprotectin	Stool marker of gut inflammation.	Elevated in Crohn’s disease.
F085	FCR	Fludarabine, Cyclophosphamide, Rituximab	Chemotherapy regimen.	Used in chronic lymphocytic leukemia.
F086	FCS	Familial Chylomicronemia Syndrome	Rare lipid disorder.	Causes recurrent pancreatitis.
F087	FCT	Focal Cryotherapy	Localized freezing for cancer treatment.	Applied in prostate cancer.
F088	FCV	Feline Calicivirus	Model for human viral research.	Studied in immunology labs.
F089	FDG	Fluorodeoxyglucose	Radioactive tracer in PET scans.	Used in oncology imaging.
F090	FDR	First-Degree Relative	Immediate family relation.	Risk factor in genetic diseases.
F091	FDV	Forced Deflation Volume	Spirometry measurement.	Used in restrictive lung disease.
F092	FEES	Fiberoptic Endoscopic Evaluation of Swallowing	Endoscopic swallowing assessment.	Used in dysphagia evaluation.
F093	FEM	Functional Electrical Muscle Stimulation	Therapy for muscle weakness.	Applied in rehab settings.
F094	FER	Ferritin	Protein storing iron.	Low in iron-deficiency anemia.
F095	FES	Focal Epilepsy Syndrome	Seizure disorder of focal onset.	Managed with anti-epileptics.
F096	FET	Frozen Embryo Transfer	IVF technique.	Used in assisted reproduction.
F097	FFMI	Fat-Free Mass Index	Body composition measure.	Used in malnutrition assessment.
F098	FFPE	Formalin-Fixed Paraffin-Embedded	Tissue preservation method.	Used in pathology.
F099	FFT	Fast Fourier Transform	Mathematical tool in ECG analysis.	Used in arrhythmia research.
F100	FGFR	Fibroblast Growth Factor Receptor	Receptor in cell growth.	Mutations linked to cancers.

S. No	Abbreviation	Full Form	Short Explanation	Practical Example
F101	FEV	Forced Expiratory Volume	Lung function measure during spirometry.	Used in asthma diagnosis.
F102	FEV1/FVC	FEV1 to FVC Ratio	Spirometry ratio used to classify airway obstruction.	Reduced in COPD.
F103	FEV6	Forced Expiratory Volume in 6 Seconds	Alternative spirometry measure.	Helpful in patients unable to complete full FVC.
F104	FFP3	Filtering Facepiece Class 3	High-level respirator mask for infection control.	Used in TB and COVID-19 wards.
F105	FGR	Fetal Growth Restriction	Abnormally small fetus due to pathology.	Seen in preeclampsia.
F106	FHF	Fulminant Hepatic Failure	Acute severe liver dysfunction with encephalopathy.	Often caused by hepatitis B.
F107	FIB	Fibrinogen	Clotting factor measured in bleeding disorders.	Decreased in DIC.
F108	FLC	Free Light Chains	Immunoglobulin components measured in myeloma.	Elevated in multiple myeloma.
F109	FLD	Fatty Liver Disease	Excess fat accumulation in the liver.	Associated with obesity and diabetes.
F110	FLP	Fasting Lipid Profile	Blood test for cholesterol and triglycerides.	Used to assess cardiovascular risk.
F111	FMF	Familial Mediterranean Fever	Genetic disorder with recurrent fevers and inflammation.	Treated with colchicine.
F112	FNA	Fine Needle Aspiration	Biopsy technique using a thin needle.	Performed in breast lumps.
F113	FNH	Focal Nodular Hyperplasia	Benign liver lesion.	Often found incidentally on imaging.
F114	FNP	Family Nurse Practitioner	Advanced practice nurse specializing in family medicine.	Provides primary care in clinics.
F115	FOB	Fecal Occult Blood	Hidden blood in stool sample.	Screening for colon cancer.
F116	FOXP3	Forkhead Box Protein P3	Marker for regulatory T-cell function.	Mutations cause IPEX syndrome.
F117	FPG	Fasting Plasma Glucose	Standard test for diabetes diagnosis.	>126 mg/dL indicates diabetes.
F118	FRC	Functional Residual Capacity	Lung volume after normal exhalation.	Reduced in restrictive lung disease.
F119	FRG	Frontal Gyrus	Brain region associated with cognition.	Studied in neuropsychiatric disorders.
F120	FRP	Fasting Renal Profile	Panel assessing kidney function.	Ordered in chronic kidney disease.
F121	FRS	Framingham Risk Score	Cardiovascular risk assessment tool.	Estimates 10-year MI/stroke risk.
F122	FRU	Fructosamine	Glycated protein reflecting short-term glucose control.	Alternative to HbA1c.
F123	FSHD	Facioscapulohumeral Dystrophy	Genetic muscle disorder.	Patients present with shoulder weakness.
F124	FSIGT	Frequently Sampled Intravenous Glucose Tolerance	Test of insulin sensitivity.	Used in metabolic research.
F125	FTD	Frontotemporal Dementia	Neurodegenerative disease affecting frontal lobes.	Causes personality changes.
F126	FTI	Free Thyroxine Index	Measure of thyroid hormone activity.	Used in thyroid function testing.
F127	FTN	Failure to Thrive	Poor growth in children.	Investigated in pediatric medicine.
F128	FTO	Fat Mass and Obesity Associated Gene	Genetic risk factor for obesity.	Studied in metabolic syndrome.
F129	FTP	Fibrinogen Thrombin Potential	Test of fibrinogen functionality.	Used in coagulation labs.
F130	FU	Follow-Up	Continued patient evaluation after treatment.	FU after pneumonia therapy.
F131	FVC	Forced Vital Capacity	Maximum air exhaled after full inhalation.	Reduced in restrictive lung disease.
F132	FVP	Focal Ventricular Premature Beat	Abnormal heart rhythm on ECG.	Detected in Holter monitoring.
F133	FXTAS	Fragile X-associated Tremor/Ataxia Syndrome	Neurological disorder linked to Fragile X gene.	Seen in older male carriers.
F134	FZP	Fuzzy Zonal Pattern	Imaging pattern in liver or kidney lesions.	Seen in radiology reports.
F135	FDI	First Dorsal Interosseous	Hand muscle tested in neurology.	Weakness in ulnar nerve palsy.
F136	FFP	Fresh Frozen Plasma	Plasma containing clotting factors.	Used in massive transfusion protocol.
F137	FTT	Failure to Thrive	Condition of poor growth in children.	Seen in malnutrition.
F138	FVL	Factor V Leiden	Genetic mutation predisposing to thrombosis.	Tested in recurrent DVT cases.
F139	FWB	Full Weight Bearing	Orthopedic instruction post-surgery.	Allowed after fracture healing.
F140	FXS	Fragile X Syndrome	Genetic cause of intellectual disability.	Diagnosed with genetic testing.
F141	FZC	Free Zinc Concentration	Trace element measurement.	Checked in malnutrition.
F142	FMT	Fecal Microbiota Transplant	Transfer of healthy stool microbes to restore gut flora.	Used in recurrent C. difficile infection.
F143	FISH	Fluorescence In Situ Hybridization	Cytogenetic test detecting chromosomal abnormalities.	Used in CML and leukemia.
F144	FPIES	Food Protein-Induced Enterocolitis Syndrome	Severe allergic reaction in infants.	Triggered by milk or soy.
F145	FCP	Fecal Calprotectin	Stool marker of gut inflammation.	Elevated in inflammatory bowel disease.
F146	FTDALS	Frontotemporal Dementia with ALS	Overlap syndrome of dementia and motor neuron disease.	Identified in neurology clinics.
F147	FPR	False Positive Rate	Statistical measure in diagnostic tests.	Evaluated in screening programs.
F148	FNR	False Negative Rate	Proportion of missed true cases.	Important in sensitivity analysis.
F149	FST	Follicle Stimulating Test	Endocrine test of pituitary function.	Done in fertility evaluation.
F150	FXG	Fragile X Gene	Gene responsible for Fragile X syndrome.	Detected with DNA testing.
F151	FCM	Ferric Carboxymaltose	IV iron preparation.	Used in iron-deficiency anemia.
F152	FVPB	Frequent Ventricular Premature Beats	Repeated abnormal heart rhythms.	Seen on 24-hour Holter monitoring.
F153	FCPR	Fasting C-Peptide	Reflects pancreatic insulin secretion.	Used in diabetes classification.
F154	FCR	Fractional Clearance of Renal Tubules	Indicates tubular handling of solutes.	Used in renal physiology studies.
F155	FCS	Familial Chylomicronemia Syndrome	Rare lipid disorder with triglyceride elevation.	Presents with recurrent pancreatitis.
F156	FDC	Fixed-Dose Combination	Drug formulation containing multiple medications.	Common in HIV therapy.
F157	FIB-4	Fibrosis-4 Index	Non-invasive liver fibrosis score.	Used in hepatitis C follow-up.
F158	FSTL1	Follistatin-Like Protein 1	Biomarker for cardiac remodeling.	Studied in heart failure.
F159	FTD-MND	Frontotemporal Dementia with Motor Neuron Disease	Combined neurodegenerative condition.	Causes rapid decline in patients.
F160	FSS	Fatigue Severity Scale	Tool to measure chronic fatigue severity.	Applied in multiple sclerosis patients.
F161	FHR	Fetal Heart Rate	Heart rate monitoring during pregnancy.	Tracked in labor with CTG.
F162	FBA	Foreign Body Aspiration	Inhalation of an object into airways.	Common in children with choking.
F163	FES	Focal Epileptic Seizure	Seizure starting from one brain area.	Treated with anticonvulsants.
F164	FMS	Fibromyalgia Syndrome	Chronic pain disorder with fatigue and sleep issues.	Managed with lifestyle and medications.
F165	FMD	Fibromuscular Dysplasia	Vascular disorder causing arterial stenosis.	Seen in renal artery hypertension.
F166	FMP	Final Menstrual Period	Marker of menopause onset.	Recorded in gynecological history.
F167	FOL	Folate	Vitamin B9 measured in blood.	Deficiency causes megaloblastic anemia.
F168	FAI	Free Androgen Index	Ratio used in PCOS evaluation.	Elevated in hyperandrogenism.
F169	FPGT	Fasting Plasma Glucose Test	Formal test for diabetes diagnosis.	Conducted after 8-hour fasting.
F170	FST	Fluid Stimulation Test	Diagnostic fluid challenge test.	Used in endocrinology research.
F171	FNPB	Functional Negative Pressure Breathing	Respiratory physiotherapy method.	Applied in ICU rehabilitation.
F172	FDR	False Discovery Rate	Statistical measure in clinical research.	Used in biomarker studies.
F173	FCPe	Fecal Carboxypeptidase	Stool enzyme measured in pancreatic function tests.	Low in pancreatic insufficiency.
F174	FGT	Female Genital Tract	Anatomical term in gynecology.	Infections studied in internal medicine overlap.
F175	FHHt	Familial Hyperkalemic Hypertension	Genetic disorder of electrolyte imbalance.	Managed with thiazide diuretics.
F176	FHP	Familial Hyperprolactinemia	Rare inherited disorder with high prolactin.	Causes infertility.
F177	FPL	Familial Partial Lipodystrophy	Genetic fat distribution disorder.	Causes insulin resistance.
F178	FRS2	Fibroblast Growth Factor Receptor Substrate 2	Molecular marker in cancer biology.	Studied in lung adenocarcinoma.
F179	FTD-PNFA	Frontotemporal Dementia Progressive Nonfluent Aphasia	Variant of frontotemporal dementia.	Patients present with speech impairment.
F180	FPGM	Fasting Plasma Glucose Measurement	Test for glucose regulation.	Standard in diabetic follow-ups.
F181	FIBTEM	Fibrinogen Thromboelastometry	Part of ROTEM coagulation testing.	Applied in liver transplant surgery.
F182	FBN1	Fibrillin-1 Gene	Gene mutated in Marfan syndrome.	Genetic testing confirms diagnosis.
F183	FBCM	Full Blood Cell Morphology	Detailed look at cell shapes in blood film.	Used in hematology labs.
F184	FGRS	Fetal Growth Restriction Syndrome	Severe form of intrauterine growth retardation.	Managed with close monitoring.
F185	FGF21	Fibroblast Growth Factor 21	Hormone regulating glucose and lipid metabolism.	Studied in obesity therapies.
F186	FSSG	Frequency Scale for Symptoms of GERD	Questionnaire for reflux disease.	Applied in gastroenterology.
F187	FFPH	Faculty of Public Health	Professional medical body.	Provides guidelines for internal medicine training.
F188	FAIg	Free Androgen Index (Genetic)	Molecular test variant for androgen measurement.	Applied in endocrinology genetics.
F189	FHB	Fetal Hemoglobin	Hemoglobin variant in newborns.	Elevated in thalassemia.
F190	FGF23	Fibroblast Growth Factor 23	Regulates phosphate metabolism.	Elevated in chronic kidney disease.
F191	FTDL	Frontotemporal Dementia with Language Variant	Subtype of dementia.	Affects speech before memory.
F192	FIS	Fasting Insulin Sensitivity	Test for insulin resistance.	Used in metabolic research.
F193	FMTT	Fecal Microbiota Transfer Therapy	Restoring healthy gut flora.	Emerging in IBS treatment.
F194	FAD	Flavin Adenine Dinucleotide	Coenzyme in energy metabolism.	Deficiency linked to B2 deficiency.
F195	FQHC	Federally Qualified Health Center	US healthcare facility designation.	Provides primary care to underserved populations.
F196	FAPD	Functional Abdominal Pain Disorder	Chronic pain without organic cause.	Common in pediatrics.
F197	FSP	Fibrin Split Products	Fragments indicating clot breakdown.	Elevated in DIC.
F198	FBN	Fibrillin	Structural protein of connective tissue.	Defective in Marfan syndrome.
F199	FHHc	Familial Hypocalciuric Hypercalcemia, Complicated	Severe variant of FHH.	Requires genetic counseling.
F200	FQRS	Fragmented QRS	ECG abnormality linked to scar tissue.	Seen post-myocardial infarction.