Proof-of-principle method suggests much-earlier diagnoses could be done with clinic test.

An international team of scientists, led by researchers at the UCSD School of Medicine, report finding a highly accurate blood-based measure that could lead to development of a clinical test for autism spectrum disorder risk in males as young as one to two years old. The degree of accuracy out performs other behavioral and genetic screens for infants and toddlers with ASD described in literature.
JAMA Psychiatry 3/4/15