The Histamine Plasma Test measures histamine levels in the blood to help evaluate allergic reactions, mast cell disorders, or other conditions linked to abnormal histamine release. Elevated levels may indicate allergies, mastocytosis, or anaphylaxis, while low levels can affect digestive and immune function.

The Tryptase Test measures blood levels of tryptase, an enzyme released by mast cells, to evaluate allergic reactions and mast cell disorders. Elevated tryptase may indicate anaphylaxis, mastocytosis, or mast cell activation syndrome (MCAS). Doctors order this test for patients with severe allergic symptoms, unexplained flushing, or anaphylaxis. Results provide essential insight for diagnosing mast cell–related conditions and guiding allergy or immunology treatment.

The Gastrin Test measures gastrin hormone levels in blood, which regulate stomach acid production. Elevated levels may indicate Zollinger-Ellison syndrome, gastrinoma, pernicious anemia, or chronic atrophic gastritis. Doctors order this test for patients with recurrent ulcers, abdominal pain, or unexplained diarrhea. Results help evaluate abnormal acid production, detect tumors, and guide treatment for gastrointestinal and metabolic conditions.