Lab report names starting with F

Abbreviations

• %fPSAPSA, Free Percent (% Free PSA)The share of your PSA that is not attached to other proteins. With a mildly raised total PSA, a lower share goes with a higher chance a biopsy finds cancer.
• f/t PSAPSA, Free Percent (% Free PSA)The share of your PSA that is not attached to other proteins. With a mildly raised total PSA, a lower share goes with a higher chance a biopsy finds cancer.
• F0-F4FibroSure Fibrosis Stage (METAVIR F0-F4)The liver scarring stage, from F0 (none) to F4 (cirrhosis), estimated from the FibroSure blood score. It is not a biopsy result.
• f001Egg White IgEMeasures IgE antibodies to egg white in your blood. A detectable result means your immune system is sensitized to egg, which is not the same as an allergy.
• F003Codfish IgEShows whether your immune system has made IgE antibodies to codfish. This is called sensitization and doesn't always mean a fish allergy.
• f004Wheat IgEMeasures IgE antibodies to wheat. A raised result is common in people with grass pollen allergy and does not confirm wheat allergy by itself.
• F010Sesame Seed IgEShows whether your immune system has made IgE antibodies to sesame. This is called sensitization and doesn't always mean a sesame allergy.
• f013Peanut IgEMeasures IgE antibodies to whole peanut in your blood. A detectable result means you are sensitized to peanut, which is not the same as a peanut allergy.
• F014Soybean IgEShows whether your immune system has made IgE antibodies to soy. This is called sensitization and doesn't always mean a soy allergy.
• f017Hazelnut (Filbert) IgEMeasures IgE antibodies to hazelnut. A raised result can reflect a true hazelnut allergy or a milder pattern linked to birch pollen allergy.
• F018Brazil Nut IgEMeasures IgE antibodies to Brazil nut to show whether your immune system has become sensitized to it.
• f020Almond IgEMeasures IgE antibodies to almond in your blood. A detectable result means your immune system has been sensitized to almond, which is not the same as an allergy.
• F024Shrimp IgEShows whether your immune system has made IgE antibodies to shrimp. This is called sensitization and doesn't always mean a shrimp allergy.
• F041Salmon IgEShows whether your immune system has made IgE antibodies to salmon. This is called sensitization and doesn't always mean a fish allergy.
• F078Bos d 8 casein (milk) IgEMeasures IgE antibodies to casein, a main protein in cow's milk that holds up to heat, to show whether your immune system has become sensitized to it.
• f1Egg White IgEMeasures IgE antibodies to egg white in your blood. A detectable result means your immune system is sensitized to egg, which is not the same as an allergy.
• f10Sesame Seed IgEShows whether your immune system has made IgE antibodies to sesame. This is called sensitization and doesn't always mean a sesame allergy.
• f13Peanut IgEMeasures IgE antibodies to whole peanut in your blood. A detectable result means you are sensitized to peanut, which is not the same as a peanut allergy.
• f14Soybean IgEShows whether your immune system has made IgE antibodies to soy. This is called sensitization and doesn't always mean a soy allergy.
• f17Hazelnut (Filbert) IgEMeasures IgE antibodies to hazelnut. A raised result can reflect a true hazelnut allergy or a milder pattern linked to birch pollen allergy.
• f18Brazil Nut IgEMeasures IgE antibodies to Brazil nut to show whether your immune system has become sensitized to it.
• f2Milk IgEMeasures IgE antibodies to cow's milk proteins. A higher level means your body is sensitized to milk, which is not the same as having a milk allergy.
• f20Almond IgEMeasures IgE antibodies to almond in your blood. A detectable result means your immune system has been sensitized to almond, which is not the same as an allergy.
• f201Pecan Nut IgEMeasures IgE antibodies to pecan nut in your blood. A detectable result means you are sensitized to pecan, which is not the same as an allergy.
• f202Cashew Nut IgEMeasures IgE antibodies to cashew nut to show whether your immune system has become sensitized to it.
• f203Pistachio IgEShows whether your immune system has made IgE antibodies to pistachio. This is called sensitization and doesn't always mean a pistachio allergy.
• f233Gal d 1 ovomucoid (egg) IgEMeasures IgE to ovomucoid, the egg white protein that survives cooking, to help clinicians think about reactions to baked or cooked egg.
• f24Shrimp IgEShows whether your immune system has made IgE antibodies to shrimp. This is called sensitization and doesn't always mean a shrimp allergy.
• f256Walnut IgEMeasures IgE antibodies to walnut. A raised result can reflect a true walnut allergy or a pollen-related pattern, and it does not confirm an allergy on its own.
• f3Codfish IgEShows whether your immune system has made IgE antibodies to codfish. This is called sensitization and doesn't always mean a fish allergy.
• f352Ara h 8 (peanut) IgEMeasures IgE to Ara h 8, a peanut protein that looks like a birch pollen protein. It is generally linked to milder, mouth-area symptoms, though stronger reactions are not ruled out.
• f4Wheat IgEMeasures IgE antibodies to wheat. A raised result is common in people with grass pollen allergy and does not confirm wheat allergy by itself.
• f41Salmon IgEShows whether your immune system has made IgE antibodies to salmon. This is called sensitization and doesn't always mean a fish allergy.
• f423Ara h 2 (peanut) IgEMeasures IgE to Ara h 2, a peanut seed protein. It is one of the peanut components most closely tied to true peanut allergy and strong reactions.
• f439Cor a 14 (hazelnut) IgEMeasures IgE to Cor a 14, a hazelnut storage protein. It is more often found in people who react to eating hazelnut.
• f443Ana o 3 (cashew) IgEMeasures IgE to Ana o 3, a protein stored in cashew seeds. Higher levels are more common in people with true cashew allergy, including strong reactions.
• f78Bos d 8 casein (milk) IgEMeasures IgE antibodies to casein, a main protein in cow's milk that holds up to heat, to show whether your immune system has become sensitized to it.
• F8Factor VIII ActivityMeasures how well factor VIII, a clotting protein that is low in hemophilia A, is working in your blood.
• FAIFree Androgen Index (FAI)A calculated estimate of how much testosterone is free to act, found by dividing total testosterone by SHBG.
• FANAAntinuclear Antibodies (ANA) ScreenA first-step blood test that looks for antibodies to the cell nucleus. A positive result is common and does not by itself mean you have an autoimmune disease.
• FBCCBC With Differential/PlateletLab panelRed cells, hemoglobin, white cells with the five-part differential (percent and absolute), and platelets.
• FBGGlucoseGlucose is the sugar in your blood and your body's main fuel. This test shows how much is there at the moment the sample is drawn.
• FBSGlucoseGlucose is the sugar in your blood and your body's main fuel. This test shows how much is there at the moment the sample is drawn.
• fC1-INHC1 Esterase Inhibitor, functionalHow well your C1 inhibitor protein works, shown as a percent of normal. A low result is a key clue in testing for hereditary angioedema.
• FCOHbCarboxyhemoglobin (COHb)The share of your hemoglobin that is bound to carbon monoxide instead of oxygen. It shows recent carbon monoxide exposure, including from smoking.
• FCPCalprotectin, FecalA protein released by white blood cells into the gut. Higher levels in a stool sample can be a sign of inflammation in the intestines.
• FeIron, SerumThe amount of iron travelling in your blood at the moment of the draw. It swings with meals, supplements and the time of day.
• FENUrine Fentanyl ScreenA urine screen for fentanyl, a very strong opioid, and norfentanyl, its main breakdown product. A positive result is presumptive until confirmed.
• FENTUrine Fentanyl ScreenA urine screen for fentanyl, a very strong opioid, and norfentanyl, its main breakdown product. A positive result is presumptive until confirmed.
• FERRFerritinA protein that stores iron in your cells. The small amount in your blood reflects how much iron your body has in reserve.
• FIB-4FIB-4 IndexA score worked out from your age, AST, ALT and platelet count. It helps estimate the chance of advanced scarring (fibrosis) in the liver.
• FibroTestFibroSure Fibrosis ScoreA 0 to 1 score from blood tests that estimates how much scarring (fibrosis) the liver has, without a biopsy. FibroSure is Labcorp's brand name for it.
• FITFecal Immunochemical Test (FIT)A stool test that looks for tiny amounts of blood you cannot see. It is used in routine bowel cancer checks and when bleeding in the gut is suspected.
• FK506TacrolimusThe amount of the anti-rejection medicine tacrolimus in your blood just before your next dose, used by your transplant team to fine-tune treatment.
• FLC ratioFree Kappa/Lambda Light Chain RatioCompares kappa with lambda free light chains. A lopsided ratio can be a clue to a plasma cell condition, but kidney disease also shifts it.
• FMetHbMethemoglobin (MetHb)The share of your hemoglobin in a form that can't carry oxygen well. Labs usually report up to about 1.5%, and higher levels can cause blue-gray skin.
• fMNMetanephrine, Free, PlasmaMeasures free metanephrine, a breakdown product of adrenaline, in a blood sample. Doctors use it to look into adrenal gland tumors.
• fNMNNormetanephrine, Free, PlasmaMeasures free normetanephrine, a breakdown product of norepinephrine, in a blood sample. Doctors use it to look into adrenal gland tumors.
• FOBTFecal Immunochemical Test (FIT)A stool test that looks for tiny amounts of blood you cannot see. It is used in routine bowel cancer checks and when bleeding in the gut is suspected.
• FPGGlucoseGlucose is the sugar in your blood and your body's main fuel. This test shows how much is there at the moment the sample is drawn.
• fPSAPSA, FreeThe part of the PSA in your blood that is not attached to other proteins. It is read next to total PSA, not by itself.
• FRAFructosamineFructosamine measures sugar-coated proteins in your blood, mostly albumin, and reflects your average blood sugar over the last 2 to 4 weeks.
• Free PSProtein S, Free AntigenMeasures the active, unbound form of protein S, a natural blood thinner. It is the test many labs use first to look for low protein S.
• free PSAPSA, FreeThe part of the PSA in your blood that is not attached to other proteins. It is read next to total PSA, not by itself.
• FSHFollicle-Stimulating Hormone (FSH)A pituitary hormone that helps run the menstrual cycle in women and sperm production in men. It rises after menopause.
• FT3Free T3 (Free Triiodothyronine)The unattached, active form of the thyroid hormone T3, which drives how fast your cells use energy. It is usually checked after TSH and free T4.
• FT4Free T4 (Free Thyroxine)The unattached, ready-to-use part of thyroxine (T4), the main hormone your thyroid makes. It shows how much thyroid hormone is available to your body.
• FT4IFree Thyroxine Index (T7)A calculated estimate of how much active thyroxine (T4) is available, worked out from total T4 and T3 uptake. It is an older alternative to measuring free T4.
• FTA-ABSSyphilis Antibody, TreponemalLooks for antibodies to the bacterium that causes syphilis. It usually stays positive for life after an infection, even a treated one.
• FTIFree Thyroxine Index (T7)A calculated estimate of how much active thyroxine (T4) is available, worked out from total T4 and T3 uptake. It is an older alternative to measuring free T4.
• FVIIIFactor VIII ActivityMeasures how well factor VIII, a clotting protein that is low in hemophilia A, is working in your blood.
• FVLFactor V Leiden (R506Q)A DNA test for a common inherited change in the F5 gene that lets blood clot a little more easily. Most people who carry it never develop a problem clot.