The DAO enzyme activity test (DAO Test) is a diagnostic test to measure the activity of DAO (Diaminooxidase) enzyme in blood.
Certain migraine sufferers may find out if the source of their condition is in a disorder of metabolism of Histamine present in certain foods rich in this substance. The Test measures the activity of the DAO enzyme and is very useful in the prevention of migraine attacks.
There is a great variety of symptoms derived from the DAO enzyme deficiency. Patients do not necessarily have all the symptoms described, but most of them are known to present on average three of these symptoms, with migraine being especially prevalent among them.