My MW can do a swab after birth in the baby's ear and send that in for a test. She actually didn't do that with my last baby and we were fine. I was never tested for it myself. My MW says that actually giving the mom antibiotics during labor (like they do in the hospital) doesn't keep the baby from getting GBS. It just gets rid of the symptoms in the mom. I had never heard that before. I might just have her do the swab this time to be on the safe side.