GBS Swab
Screens for Group B Strep, typically performed late in pregnancy.
About this test
A vaginal and rectal swab checks for Group B Streptococcus carriage late in pregnancy to help plan care during labor.
Common reasons for testing
- Prenatal screening, usually at 36 weeks 0 days through 37 weeks 6 days, coordinated by your obstetric clinician.
These are examples of clinical uses. Your history and symptoms determine whether testing is appropriate.
What to expect
A swab is passed over the lower vagina and rectum. Confirm collection arrangements with the team before booking.
Appointment length
Your visit is expected to take about 15 minutes at our West Ashley location.
Categories
Preparation
- No fasting is needed. Confirm pregnancy week and tell the team about antibiotic allergies and previous GBS results.
Instructions for this appointment
- A vaginal/rectal swab will be collected at your appointment.
Follow the instructions confirmed for your order. If they differ from the general guidance, contact the team before changing food, fluids, or medicines.
Order requirement
No outside order needed
Understanding your results
- A positive result usually means carriage, not that you are ill. It guides antibiotics during labor.
- A prior infant with GBS disease or GBS in urine may change the plan.
What happens next?
Make sure your obstetric team and delivery facility receive the result and document any plan for labor.
Sources & further reading
This patient summary draws on published clinical literature and professional guidance. Patient resources are identified separately below. Preparation also depends on your specific order and the collecting laboratory or imaging team.
- Prevention of Group B Streptococcal Early-Onset Disease in Newborns: ACOG Committee Opinion 797
Obstetrics & Gynecology, 2020
Content updated October 11, 2026. General education; individual advice comes from your care team.
Know the cost before your visit
Palmetto Preventive is a direct-pay service. You will see clear payment terms before your booking is finalized — no surprise lab bill.
Self-pay price
One transparent price for this test. Payment terms are presented before your booking is finalized.
Start bookingOur pricing promise
Transparent self-pay pricing — you see the price before you book.
No surprise lab bill after your visit.
If testing is not approved, your payment is refunded in full.
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Start the guided booking. It takes just a few minutes, and you can move back and forth without losing your answers.