The Centers for Disease Control and Prevention (CDC) has recommended routine screening for vaginal strep B for all pregnant women. This screening is performed between the 35th and 37th week of pregnancy (studies show that testing done within 5 weeks of delivery is the most accurate at predicting the GBS status at time of birth.)
The test involves a swab of both the vagina and the rectum. The sample is then taken to a lab where a culture is analyzed for any presence of GBS. Test results are usually available within 24 to 48 hours.
https://americanpregnancy.org/pregnancycomplications/groupbstrepinfection.html
Re: What is the strep test for?
PPs have pretty much covered what it is but I will second the ASK QUESTIONS bit! I'm surprised they didn't explain it to you at any point in the process, but either way. If you're having a test done and you don't understand it, you need to ask them what they are doing and why. It's your body and your health.
The MA showed me the swab first, told me that it was nothing like the pap smear and left. I then asked the midwife if I had to spread my legs and was told no. Nothing was inserted and it was more like a quick swipe along the smooth part of the outer labia.
T 2.12 | W 5.14