Testing & Differential Diagnosis
Learn about lab markers, symptom tracking, elimination testing, preparation steps, and medical discussion points.
Tryptase Test: What the Blood Test Measures and What Results Mean
A tryptase result only makes sense in context: whether it was drawn during a reaction or at baseline, when it was collected, and...
MCAS Testing: How Mast Cell Activation Syndrome Is Diagnosed
MCAS testing combines symptom patterns with objective evidence of mast-cell activation and treatment response; no single laboratory test confirms the diagnosis.
DAO Test: Can a Blood Test Diagnose DAO Deficiency?
DAO can be measured in blood, but the result alone cannot diagnose DAO deficiency or histamine intolerance.
DAO Deficiency vs Histamine Intolerance: What’s the Difference?
Low DAO activity and suspected histamine intolerance are related concepts, but they are not interchangeable diagnoses and neither one proves the other.
Histamine Intolerance vs Food Allergies: What’s the Difference?
Both can cause similar symptoms, but they involve different mechanisms, different testing, and different emergency implications.
Histamine Intolerance Test: How Histamine Intolerance Is Actually Diagnosed
There is no single definitive test for histamine intolerance; diagnosis relies on symptom patterns, ruling out other causes, and carefully interpreted testing.
