What does this mean ttg lesd than 0.1 although iga is low at 0.6, lgg was less than0.1its from 2yr old boys blood results. he jhas gastro problems too?

Unlikely celiac : If you are saying that the tissue transglutaminase IgA & igg antibodies are both low in setting of a low total serum IgA then celiac disease is unlikely though not impossible. Antgliadin igg antibody may be helpful in this scenario of low total IgA as a sensitive but not specific test . Gold standard is a duodenal biopsy. Hla dq2 & dq8 genetic testing can confirm or exclude genetic risk.