You diagnose a 5-year-old with Autistic spectrum disorder. His examination is unremarkable and there is no family history of learning difficulties. Should you perform a molecular genetic screen for FMR1 mutations (fragile X)?

You can always wonder about testing for things, I think. As I mentioned elsewhere, you also need to think if the test is accurate and useful.

What Dr Kelly & pals at the Mary Sheridan Centre for Child Health in London have wondered is should they be undertaking FRAX testing. It’s certainly possible, but costs money – and what benefits can it produce?

What does the winder world think – do you test? Don’t you test? Why (both ways!)?