Internal Medicine Initialisms

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Internal Medicine Alphabet – F

S. No	Initialism	Full Form	Short Explanation	Practical Example
F001	FA	Folic Acid	Vitamin B9 essential for DNA synthesis.	FA supplementation in pregnancy.
F002	FAB	French–American–British Classification	Leukemia classification system.	AML typed by FAB classification.
F003	FABER	Flexion, Abduction, External Rotation	Hip examination maneuver.	FABER test positive in arthritis.
F004	FACE	Facial Artery Cheiloplasty Evaluation	Vascular reference in surgery.	FACE artery ligated in trauma.
F005	FACT	Ferritin, AST, Cholesterol, Triglycerides	Liver function biomarker panel.	FACT abnormal in fatty liver.
F006	FAD	Flavin Adenine Dinucleotide	Enzyme cofactor in metabolism.	FAD deficiency linked to anemia.
F007	FAE	Fetal Alcohol Effects	Subclinical fetal alcohol disorder.	Child showed FAE features.
F008	FAI	Femoroacetabular Impingement	Hip joint disorder.	MRI confirmed FAI.
F009	FAP	Familial Adenomatous Polyposis	Genetic colon cancer syndrome.	FAP detected in young patient.
F010	FAS	Fetal Alcohol Syndrome	Congenital disorder due to alcohol exposure.	Child diagnosed with FAS.
F011	FAST	Focused Assessment with Sonography for Trauma	Emergency ultrasound for trauma.	FAST exam showed free fluid.
F012	FBC	Full Blood Count	Same as CBC.	FBC showed anemia.
F013	FBS	Fasting Blood Sugar	Blood glucose after overnight fast.	FBS measured 110 mg/dL.
F014	FCM	Ferric Carboxymaltose	IV iron preparation.	FCM infusion given for IDA.
F015	FCR	Flexor Carpi Radialis	Wrist flexor muscle.	FCR tendon repaired.
F016	FCS	Familial Chylomicronemia Syndrome	Rare lipid disorder.	FCS diagnosed by lipid profile.
F017	FCT	Functional Capacity Test	Exercise tolerance measure.	FCT performed pre-op.
F018	FD	Functional Dyspepsia	Chronic upper GI discomfort without ulcers.	FD treated with PPIs.
F019	FDA	Food and Drug Administration	US regulatory body.	Drug approved by FDA.
F020	FDP	Fibrin Degradation Products	Indicators of fibrinolysis.	FDP elevated in DIC.
F021	FDS	Flexor Digitorum Superficialis	Finger flexor muscle.	FDS strength tested.
F022	FDT	Frequency Doubling Technology	Visual field test for glaucoma.	FDT abnormal in glaucoma patient.
F023	FE	Iron (Ferrum)	Element essential for hemoglobin.	FE deficiency caused anemia.
F024	FEV	Forced Expiratory Volume	Spirometry measure of lung function.	FEV1 reduced in COPD.
F025	FFP	Fresh Frozen Plasma	Blood product containing clotting factors.	FFP transfused in coagulopathy.
F026	FFT	Fast Fourier Transform	Used in signal processing like ECG.	ECG analyzed by FFT.
F027	FGD	Fasting Glucose Determination	Blood glucose check.	FGD done at 8 am.
F028	FGF	Fibroblast Growth Factor	Protein involved in repair.	FGF studied in wound healing.
F029	FGR	Fetal Growth Restriction	Poor fetal growth in utero.	Doppler showed FGR.
F030	FGS	Female Genital Schistosomiasis	Parasitic infection.	FGS confirmed by biopsy.
F031	FGT	Female Genital Tract	Anatomical region.	FGT exam done in infertility case.
F032	FH	Family History	Genetic/medical history from relatives.	Positive FH of diabetes.
F033	FHH	Familial Hypocalciuric Hypercalcemia	Benign inherited hypercalcemia.	FHH suspected due to low urine calcium.
F034	FHR	Fetal Heart Rate	Heart rate of fetus in utero.	FHR monitored by CTG.
F035	FHS	Fetal Heart Sounds	Audible fetal cardiac activity.	FHS detected at 12 weeks.
F036	FISH	Fluorescence In Situ Hybridization	Genetic test for chromosomal abnormalities.	FISH positive for BCR-ABL.
F037	FIV	Feline Immunodeficiency Virus	Veterinary retrovirus (analogous to HIV).	FIV studied in research.
F038	FIX	Factor IX	Coagulation factor.	FIX deficiency causes Hemophilia B.
F039	FJP	Febrile Juvenile Periodic Syndrome	Autoinflammatory disorder.	FJP presented with recurrent fever.
F040	FJP	Femoro-Jugular Pressure	Hemodynamic parameter.	FJP increased in CHF.
F041	FL	Follicular Lymphoma	Indolent type of NHL.	FL confirmed on lymph node biopsy.
F042	FLA	Fluoroacetic Acid	Toxic compound.	FLA poisoning reported.
F043	FLD	Fatty Liver Disease	Hepatic fat accumulation.	Ultrasound revealed FLD.
F044	FLC	Free Light Chains	Immunoglobulin fragments in plasma.	FLC elevated in multiple myeloma.
F045	FLDCS	Frontal Lobe Dysfunction Cognitive Syndrome	Neuropsychiatric disorder.	FLDCS diagnosed in TBI patient.
F046	FLE	Frontal Lobe Epilepsy	Epilepsy type originating in frontal lobe.	FLE confirmed by EEG.
F047	FLP	Fasting Lipid Profile	Blood test for cholesterol.	FLP abnormal in dyslipidemia.
F048	FLT3	Fms-like Tyrosine Kinase 3	Gene mutation in AML.	FLT3 mutation positive in leukemia.
F049	FMA	Functional Movement Assessment	Musculoskeletal screening.	FMA done for rehab planning.
F050	FMF	Familial Mediterranean Fever	Genetic inflammatory disorder.	FMF treated with colchicine.

S. No	Initialism	Full Form	Short Explanation	Practical Example
F051	FML	Familial Myeloid Leukemia	Genetic form of leukemia.	FML identified via cytogenetics.
F052	FMP	First Menstrual Period (Menarche)	Onset of menstruation.	FMP documented at age 12.
F053	FMR	Functional Mitral Regurgitation	Mitral regurgitation due to LV dilation.	Echo revealed FMR.
F054	FMS	Fibromyalgia Syndrome	Chronic widespread pain disorder.	Patient managed for FMS.
F055	FMT	Fecal Microbiota Transplant	Transfer of stool bacteria for therapy.	FMT performed in recurrent C. diff.
F056	FMX	Full Mouth X-ray	Dental panoramic imaging.	FMX used in dental planning.
F057	FN	False Negative	Test fails to detect condition.	FN occurred in TB skin test.
F058	FNA	Fine Needle Aspiration	Biopsy technique with thin needle.	FNA performed on thyroid nodule.
F059	FNB	Femoral Nerve Block	Regional anesthesia technique.	FNB given for hip fracture.
F060	FNH	Focal Nodular Hyperplasia	Benign liver tumor.	MRI showed FNH lesion.
F061	FNP	Family Nurse Practitioner	Advanced practice nurse.	FNP managed diabetic patient.
F062	FNS	Functional Neurological Symptom Disorder	Conversion disorder.	FNS diagnosed after excluding organic cause.
F063	FNT	False Negative Test	Similar to FN.	FNT led to misdiagnosis.
F064	FO	Foreign Object	External object inside body.	FO removed from airway.
F065	FOA	Foramen Ovale Aneurysm	Atrial septal abnormality.	Echo confirmed FOA.
F066	FOB	Fecal Occult Blood	Stool test for hidden blood.	FOB positive in colon cancer screening.
F067	FOBT	Fecal Occult Blood Test	Screening test for GI bleeding.	FOBT recommended for >50 yrs.
F068	FOL	Follicle	Small ovarian structure.	Ultrasound monitored FOL development.
F069	FOM	Floor of Mouth	Anatomical location.	Tumor detected at FOM.
F070	FOS	Fibro-Osseous Lesion	Bone lesion category.	Biopsy showed FOS.
F071	FP	False Positive	Test incorrectly positive.	FP result in HIV screening.
F072	FPG	Fasting Plasma Glucose	Blood sugar after overnight fast.	FPG measured 120 mg/dL.
F073	FPIES	Food Protein-Induced Enterocolitis Syndrome	Rare food allergy in infants.	FPIES triggered by milk protein.
F074	FPL	Flexor Pollicis Longus	Thumb flexor muscle.	FPL tendon repaired.
F075	FPR	False Positive Rate	Frequency of incorrect positives.	FPR high in rapid tests.
F076	FPS	Frames Per Second	Imaging speed in diagnostics.	CT angiography captured at 20 FPS.
F077	FPT	Free Prostate Test	PSA-related measure.	FPT assessed in prostate cancer.
F078	FR	Fracture	Bone break or crack.	X-ray showed tibial FR.
F079	FRAX	Fracture Risk Assessment Tool	Calculates 10-year fracture risk.	FRAX score guided osteoporosis treatment.
F080	FRC	Functional Residual Capacity	Lung volume after passive expiration.	FRC reduced in restrictive lung disease.
F081	FRS	Framingham Risk Score	Estimates 10-year CV risk.	FRS used in lipid clinic.
F082	FS	Frozen Section	Intraoperative rapid biopsy.	FS confirmed malignancy.
F083	FSH	Follicle-Stimulating Hormone	Pituitary hormone regulating reproduction.	FSH elevated in menopause.
F084	FSHD	Facioscapulohumeral Muscular Dystrophy	Genetic muscle disorder.	Genetic test confirmed FSHD.
F085	FSL	Functional Status Level	Patient ability measurement.	FSL documented at admission.
F086	FSM	Fetal Scalp Monitoring	Intrapartum fetal monitoring.	FSM showed decelerations.
F087	FSP	Fibrin Split Products	Similar to FDP.	FSP elevated in DIC.
F088	FSR	Fractional Synthetic Rate	Protein synthesis measure.	FSR calculated for muscle protein.
F089	FSS	Functional Somatic Syndrome	Disorder with somatic symptoms.	FSS suspected in chronic fatigue.
F090	FT3	Free Triiodothyronine	Active thyroid hormone.	FT3 checked in hyperthyroidism.
F091	FT4	Free Thyroxine	Thyroid hormone measure.	FT4 elevated in Graves’ disease.
F092	FTA	Fluorescent Treponemal Antibody	Syphilis confirmatory test.	FTA-ABS positive in late syphilis.
F093	FTD	Frontotemporal Dementia	Neurodegenerative disorder.	FTD suspected in early-onset dementia.
F094	FTE	Full-Time Equivalent	Staff workload measure.	FTE used in hospital staffing.
F095	FTI	Free Thyroxine Index	Thyroid function calculation.	FTI abnormal in thyroid disease.
F096	FTN	Failure to Thrive	Poor growth in infants.	FTN diagnosed in malnourished child.
F097	FTO	Fat Mass and Obesity-Associated Gene	Obesity-related gene.	FTO variant linked with weight gain.
F098	FTP	Full-Term Pregnancy	Pregnancy reaching ≥37 weeks.	Woman delivered after FTP.
F099	FTR	Failure to Rescue	Mortality metric after complications.	FTR rates monitored in ICU.
F100	FTS	First Trimester Screening	Prenatal test for anomalies.	FTS positive for Down syndrome.
F101	FU	Follow-Up	Continued patient monitoring.	FU scheduled after discharge.
F102	FUBC	Follow-Up Blood Culture	Repeat culture after infection.	FUBC sent post-antibiotics.
F103	FVC	Forced Vital Capacity	Lung function test volume.	FVC reduced in restrictive lung disease.
F104	FVL	Factor V Leiden	Genetic thrombophilia mutation.	FVL mutation found in DVT case.
F105	FVIII	Factor VIII	Coagulation factor.	FVIII deficiency in Hemophilia A.
F106	FVR	Febrile Viral Rash	Rash due to viral infection.	FVR noted in measles.
F107	FVS	Focal Ventricular Seizure	Localized seizure activity.	EEG confirmed FVS.
F108	FW	Fundus of the Womb	Uterine top portion.	FW measured at 20 weeks.
F109	FWB	Full Weight Bearing	Orthopedic mobility instruction.	Patient allowed FWB after fracture.
F110	FWT	Free Water Test	Test for diabetes insipidus.	FWT performed with desmopressin.
F111	FX	Fracture	Same as FR.	X-ray confirmed radius FX.
F112	FXN	Frataxin	Protein deficient in Friedreich’s ataxia.	FXN gene mutation confirmed.
F113	FY	Fya (Duffy Antigen)	Blood group antigen.	Patient typed negative for FY.
F114	FZP	Fluprazine	Serotonin antagonist drug.	FZP used in psychiatry.
F115	F-Actin	Filamentous Actin	Cytoskeletal protein.	F-Actin antibody positive in autoimmune hepatitis.
F116	F-IRI	Fasting Insulin Resistance Index	Insulin sensitivity test.	F-IRI abnormal in metabolic syndrome.
F117	F-PEF	Forced Peak Expiratory Flow	Spirometry parameter.	F-PEF measured low in asthma.
F118	F-PET	Fluorine-18 PET Scan	Functional imaging test.	F-PET showed tumor activity.
F119	F-PSA	Free Prostate-Specific Antigen	Biomarker for prostate disease.	F-PSA ratio used in cancer risk.
F120	F-VC	Forced Vital Capacity	Same as FVC.	Spirometry showed low F-VC.
F121	FAIr	Fractional Area Index Right Ventricle	Echo-derived measure.	FAIr low in RV dysfunction.
F122	FAMMM	Familial Atypical Multiple Mole Melanoma	Genetic melanoma syndrome.	FAMMM identified in family.
F123	FANC	Fanconi Anemia	Genetic bone marrow failure syndrome.	FANC confirmed by chromosomal breakage test.
F124	FAPD	Functional Abdominal Pain Disorder	Chronic abdominal pain diagnosis.	FAPD treated with CBT.
F125	FARS	Familial Amyotrophic Lateral Sclerosis	Inherited ALS subtype.	FARS gene mutation found.
F126	FASD	Fetal Alcohol Spectrum Disorder	Range of alcohol-induced defects.	Child showed FASD signs.
F127	FASN	Fatty Acid Synthase	Enzyme for lipid biosynthesis.	FASN upregulated in cancer.
F128	FBCB	Functional Bowel and Colon Biopsy	GI tissue sampling.	FBCB performed during colonoscopy.
F129	FBN	Fibrillin	Structural protein mutated in Marfan syndrome.	FBN1 mutation confirmed.
F130	FBP	Fructose Bisphosphatase	Enzyme in gluconeogenesis.	FBP deficiency caused hypoglycemia.
F131	FBR	Foreign Body Reaction	Inflammatory response to implant.	FBR noted after pacemaker.
F132	FBSM	Fasting Blood Sugar Monitoring	Diabetes management practice.	Patient continued FBSM daily.
F133	FBT	Fasting Blood Test	Any blood test after fasting.	FBT ordered pre-op.
F134	FCI	Functional Cardiac Imaging	Non-invasive heart imaging.	FCI used for ischemia detection.
F135	FCP	Fecal Calprotectin	Stool marker of intestinal inflammation.	FCP elevated in Crohn’s disease.
F136	FCSRT	Free and Cued Selective Reminding Test	Memory assessment tool.	FCSRT abnormal in dementia.
F137	FDG	Fluorodeoxyglucose	PET imaging tracer.	FDG-PET showed hypermetabolism.
F138	FDM	Fibro Dysplasia Ossificans Progressiva	Rare genetic disorder.	FDM mutation detected.
F139	FDR	First-Degree Relative	Family member used in genetic history.	FDR with colon cancer.
F140	FDSR	Fasting Daily Serum Record	Monitoring system.	FDSR maintained in diabetic clinic.
F141	FEIBA	Factor Eight Inhibitor Bypassing Activity	Clotting complex for hemophilia.	FEIBA administered in bleeding episode.
F142	FEM	Focal Epileptic Myoclonus	Seizure type.	FEM diagnosed via EEG.
F143	FER	Ferritin	Iron storage protein.	FER levels low in anemia.
F144	FEV6	Forced Expiratory Volume in 6 Seconds	Spirometry measure.	FEV6 reduced in COPD.
F145	FFR	Fractional Flow Reserve	Coronary pressure measurement.	FFR guided stent placement.
F146	FGF23	Fibroblast Growth Factor 23	Hormone regulating phosphate.	FGF23 elevated in CKD.
F147	FGID	Functional Gastrointestinal Disorder	Gut disorder without structural abnormality.	FGID diagnosed in IBS.
F148	FGP	Fundic Gland Polyp	Benign gastric lesion.	Endoscopy showed FGP.
F149	FGRF	Fetal Growth Restriction Factor	Hypothetical regulator of growth.	FGRF studied in perinatology.
F150	FHRP	Fetal Heart Rate Pattern	Variation seen on CTG.	Abnormal FHRP prompted C-section.
F151	FIAU	Fialuridine	Antiviral drug withdrawn for toxicity.	FIAU trial halted.
F152	FIC	Fractional Inhibitory Concentration	Antibiotic synergy measure.	FIC index calculated.
F153	FID	Functional Iron Deficiency	Iron present but not available.	FID detected in CKD.
F154	FIF	Forced Inspiratory Flow	Spirometry index.	FIF reduced in airway obstruction.
F155	FIGO	International Federation of Gynecology & Obstetrics	Global OBGYN body.	FIGO staging used for cervical cancer.
F156	FIL	Filgrastim	G-CSF drug.	FIL given post-chemotherapy.
F157	FIM	Functional Independence Measure	Rehab scoring system.	FIM score improved post-stroke.
F158	FIN	Familial Infantile Neuropathy	Genetic disorder.	FIN mutation confirmed.
F159	FIP	Feline Infectious Peritonitis	Cat viral disease studied for coronavirus research.	FIP case reported in vet medicine.
F160	FIR	Fetal Inflammatory Response	Immune activation in fetus.	FIR suspected in chorioamnionitis.
F161	FIT	Fecal Immunochemical Test	Stool test for occult blood.	FIT used in colon cancer screening.
F162	FIVD	Failed Induction of Vaginal Delivery	Obstetric complication.	C-section due to FIVD.
F163	FJD	Familial Juvenile Diabetes	Rare genetic diabetes type.	FJD diagnosed at 15 yrs.
F164	FJP2	Febrile Juvenile Polyarthritis Type 2	Rare rheumatic condition.	FJP2 confirmed by labs.
F165	FJS	Flexible Joint Syndrome	Benign hypermobility.	FJS noted in child exam.
F166	FKA	Formerly Known As	Terminology reference.	Disease FKA “Bright’s disease”.
F167	FKT	Familial Keratoconus Trait	Genetic corneal disorder.	FKT seen in siblings.
F168	FLAIR	Fluid-Attenuated Inversion Recovery	MRI sequence.	FLAIR showed demyelination.
F169	FLD	Focal Liver Disease	Localized hepatic disorder.	Imaging revealed FLD.
F170	FLT	Flutamide	Anti-androgen drug.	FLT used in prostate cancer.
F171	FMISO	Fluoromisonidazole PET Tracer	Hypoxia imaging marker.	FMISO-PET used in oncology.
F172	FMRP	Fragile X Mental Retardation Protein	Protein lacking in Fragile X syndrome.	FMRP absent on testing.
F173	FMRI	Functional Magnetic Resonance Imaging	Brain activity imaging.	fMRI used in cognitive research.
F174	FMTVDM	Fleming Method for Tissue & Vascular Differentiation and Metabolism	Imaging quantification method.	FMTVDM applied in cardiology imaging.
F175	FNH	Focal Nodular Hyperplasia	Benign liver lesion.	MRI confirmed FNH.
F176	FNPB	Functional Nerve Pathway Block	Diagnostic block.	FNPB used in chronic pain.
F177	FOOSH	Fall On Outstretched Hand	Common injury mechanism.	FOOSH led to distal radius fracture.
F178	FOSL	Fos-related Antigen	Oncogene marker.	FOSL expression noted in tumor.
F179	FP-CIT	Fluoropropyl-Carbomethoxy-Iodophenyl-Tropane	SPECT tracer for dopamine.	FP-CIT scan used in Parkinson’s.
F180	FPLD	Familial Partial Lipodystrophy	Genetic fat distribution disorder.	FPLD confirmed genetically.
F181	FPP	Free Plasma Porphyrin	Diagnostic test for porphyria.	FPP elevated in lead poisoning.
F182	FPR1	Formyl Peptide Receptor 1	Immune receptor gene.	FPR1 mutation studied in sepsis.
F183	FPTP	Failed Preterm Trial of Labor	Delivery complication.	FPTP led to cesarean.
F184	FQ	Fluoroquinolone	Antibiotic drug class.	Ciprofloxacin is a FQ.
F185	FQRS	Fragmented QRS	ECG marker for conduction abnormality.	FQRS noted in MI patient.
F186	FRα	Folate Receptor Alpha	Tumor marker.	FRα targeted in ovarian cancer.
F187	FRCP	Fellow of Royal College of Physicians	Postgraduate qualification.	Doctor awarded FRCP.
F188	FREM	Familial Renal Malformation	Genetic disorder.	FREM mutation detected.
F189	FRN	Fibrinogen-Related Antigen	Hematological marker.	FRN studied in coagulopathies.
F190	FRS2	Fibroblast Growth Factor Receptor Substrate 2	Oncogene adaptor protein.	FRS2 overexpressed in cancer.
F191	FRT	Functional Residual Test	Pulmonary assessment.	FRT performed in COPD.
F192	FSHR	Follicle Stimulating Hormone Receptor	Receptor for FSH.	FSHR mutation linked to infertility.
F193	FSLIT	Functional Subcutaneous Immunotherapy	Allergy desensitization.	FSLIT initiated for pollen allergy.
F194	FSME	Frühsommer-Meningoenzephalitis (Tick-Borne Encephalitis)	Viral CNS infection.	FSME vaccine recommended.
F195	FSN	Fetal Spinal Neural Tube Defect	Congenital abnormality.	USG showed FSN.
F196	FSP1	Ferroptosis Suppressor Protein 1	Regulator of cell death.	FSP1 studied in oncology.
F197	FSRH	Faculty of Sexual & Reproductive Healthcare	UK medical body.	FSRH guidelines followed.
F198	FSTL	Follistatin-Like Protein	Regulator of growth factors.	FSTL measured in endocrine research.
F199	FTLD	Frontotemporal Lobar Degeneration	Group of dementias.	FTLD confirmed via imaging.
F200	FUP	Follow-Up Plan	Medical aftercare scheduling.	FUP documented before discharge.