Testing paint chips for lead?

We have a badly peeling rear exterior wall that drops paint chips onto the back deck and wanted to test to see if it was lead-based paint before we let our young child spend time out there. For whatever reason, I don’t trust the DIY kits from HD and would like to send some chips off to be tested by a real lab. It is easy enough for me to gather chips and this is all the same paint so a couple samples from the wall seems fine, so I don’t really feel like I need anyone to come out to the building. Anyone know of a reliable place to send paint chips to be tested for lead? Thank you!