The antigen leukocyte antibody test (ALCAT test) is one that claims to measure adverse reactions to dietary substances. It was created by American Medical Testing Laboratories and is now marketed by Cell Science Systems (also known as ALCAT Diagnostic Systems) of Deerfield Beach, Florida.
Researched conducted at Yale School of Medicine published in BMJ OpenGastroenterology in 2017 demonstrated improvement for those with irritable bowel syndrome[1]
"These findings reject the null hypothesis and show that a diet guided by leucocyte activation testing results in demonstrable clinical improvement in IBS. These clinical results, associated with a reduction in plasma neutrophil elastase, have implications for better understanding the role of food intolerance and the pathophysiology of IBS."[1]
A study conducted in 2014 demonstrated reactions identified as "severe" were associated with the up-regulation of CD11b on CD4+ and CD8+ T cells, suggesting a basis for further research into the mechanisms alleged.[2]
"These results have been shown to not be reproducible, give different results when duplicate samples are analysed blindly, don't correlate with those from conventional testing, and 'diagnose' food hypersensitivity in subjects with conditions where food allergy is not considered to play a pathogenic role."[8]
^Yasuhara A, Yamazaki D (October 2003). "[The method of utilizing food allergy test]". Rinsho Byori. The Japanese Journal of Clinical Pathology. Suppl 127: 73–8. PMID14653218.
^Ito K (November 2008). "[Practical diagnosis of food allergy]". Arerugi. 57 (11): 1109–16. PMID19052505.
