Acute Tryptase Test: Anaphylaxis, Mast Cell Activation, Timing, and Interpretation
An acute tryptase test is a time-sensitive blood test used to look for evidence that mast cells released their contents during a suspected anaphylactic...
Allergy Blood Test Panel: Total IgE, Specific IgE, Allergen Triggers, and Meaning
An allergy blood test panel measures immunoglobulin E antibodies in a blood sample. Depending on the order, it may include total IgE, specific IgE...
Alpha-Gal IgE Test: Red Meat Allergy, Tick Bite, Delayed Reaction, and Meaning
The alpha-gal IgE test is a blood test used to help diagnose alpha-gal syndrome, an allergy linked to tick bites and reactions to a...
Baseline Tryptase Test: Mastocytosis, Mast Cell Burden, Hereditary Alpha-Tryptasemia, and Meaning
A baseline tryptase test measures the stable amount of tryptase circulating when a person is well and at least 24 hours beyond a suspected...
Basophil Activation Test: Allergy Testing, CD63, CD203c, and Reaction Risk
The basophil activation test, or BAT, is a specialized blood test that exposes a patient’s living basophils to a suspected allergen in the laboratory....
Chronic Urticaria Blood Test Panel: IgE, Tryptase, Thyroid Antibodies, and Autoimmune Causes
A chronic urticaria blood test panel is not one fixed set of tests and usually should be limited. Chronic urticaria means recurrent hives, angioedema,...
Drug Allergy IgE Test: Medication Allergy Markers, Positive Result, and Limitations
A drug allergy IgE test is a blood test that looks for immunoglobulin E antibodies to a specific medication or a drug-related chemical structure....
Egg Component IgE Test: Ovomucoid, Ovalbumin, Allergy Risk, and Meaning
An egg component IgE test measures antibodies to individual egg proteins rather than reporting only a whole egg white result. The two components most...
Environmental Allergy IgE Panel: Pollen, Mold, Dust, Pets, and Allergy Triggers
An environmental allergy IgE panel is a blood test that looks for immunoglobulin E antibodies to airborne allergens such as tree, grass, and weed...
Eosinophil Cationic Protein Test: Asthma, Allergy Inflammation, and Eosinophil Activity
An eosinophil cationic protein test measures ECP, a granule protein released mainly by activated eosinophils. Eosinophils are white blood cells involved in type 2...
Eosinophil Count Test: Allergy, Asthma, Parasites, High Eosinophils, and Meaning
An eosinophil count measures a type of white blood cell involved in allergic inflammation, defense against some parasites, and several immune and blood disorders....
Food Allergy IgE Panel: Common Foods, Positive Results, Allergy Risk, and Meaning
A food allergy IgE panel is a blood test that measures immunoglobulin E antibodies to several foods at once. Panels commonly include milk, egg,...
Histamine Blood Test: High Levels, Allergy, Mast Cell Activation, and Meaning
A histamine blood test measures histamine in plasma, whole blood, or another specified blood fraction. Histamine is a short-lived signaling molecule released by mast...
Histamine Release Test: Allergy Reaction, Basophils, and IgE-Mediated Response
A histamine release test is a functional laboratory assay that measures how much histamine basophils release after they are exposed to an allergen, anti-IgE...
Insect Venom IgE Test: Bee, Wasp, Hornet Allergy, and Anaphylaxis Risk
An insect venom IgE test measures antibodies directed against venom from honeybees, yellow jackets, paper wasps, hornets, or other stinging insects. It is most...
Latex IgE Test: Latex Allergy, Positive Result, Cross-Reactivity, and Meaning
A latex IgE test is a blood test that looks for immunoglobulin E antibodies directed against proteins in natural rubber latex. It can support...
Leukotriene E4 Urine Test: Mast Cell Activation, Allergy, and Inflammation Meaning
A leukotriene E4 urine test measures the stable end product of cysteinyl leukotriene production. These inflammatory chemicals are released by mast cells, eosinophils, basophils,...
Mast Cell Activation Test Panel: Tryptase, Histamine, Prostaglandins, and Leukotrienes
A mast cell activation test panel uses blood and urine markers to look for objective evidence that mast cells released inflammatory mediators during a...
Milk Component IgE Test: Casein, Whey Proteins, Allergy Risk, and Meaning
A milk component IgE test measures antibodies to individual cow’s milk proteins rather than testing only a whole-milk extract. The main components include caseins,...
N-Methylhistamine Urine Test: Mast Cell Activation, Histamine Metabolite, and Meaning
An N-methylhistamine urine test measures the main urinary metabolite produced when the body breaks down histamine. Because histamine itself disappears quickly from blood, its...