Lactate

   Lactate levels are increased in Autism (Moreno,et al, 1992).

   Lactate is also increased in hypothyroidism (even in sub-clinical hypothyroidism)(Monzani et al, 1997).

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Monzani F, Caraccio N, Siciliano G, Manca L, Murri L, Ferrannini E - "Clinical and biochemical features of muscle dysfunction in subclinical hypothyroidism" J Clin Endocrinol Metab 82(10):3315-8 (1997) http://www.ncbi.nlm.nih.gov/htbin-post/Entrez/query?uid=9329360&form=6&db=m&Dopt=r

Moreno H, Borjas L, Arrieta A, Saez L, Prassad A, Estevez J, Bonilla E -
"Clinical heterogeneity of the autistic syndrome: a study of 60 families" Invest Clin 33(1):13-31 (1992)
http://www.ncbi.nlm.nih.gov/htbin-post/Entrez/query?uid=1391074&form=6&db=m&Dopt=r