👤 By the CinnaRN Clinical Content Team🕐 Updated 2026-08-23🏷️ Safety & Infection Control🔖 Free to read, print, and share
Also known as: GBS · group B strep · beta strep in pregnancy · GBS positive
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Use this quick-reference guide to spot, treat, and prevent Group B Streptococcus on the NCLEX. Keep it handy during review and on exam day!
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📒 The 1-minute cheat sheet
📌 Def
Maternal vaginal/rectal flora
Risk neonatal sepsis, pneumonia
✅ Do
Vaginal-rectal swab 36-37 wks
IV penicillin in labor if +
First dose ≥ 4 hr before birth
🧪 Meds
Pen G first-line, ampicillin alt
PCN allergy → clindamycin/vanco
🚩 Report
Newborn: temp instability, grunting
Poor feeding, lethargy in baby
📚 Group B Streptococcus — full study notes
The cheat sheet above is your quick recall card. These notes go deeper — what it is, what to do first, what must be reported, and what to teach.
Group B Streptococcus is a bacterium that can colonize the vagina and rectum without harming the mother but may cause life-threatening sepsis, pneumonia, or meningitis in the newborn if transmitted during birth. Universal screening and intrapartum antibiotics dramatically reduce neonatal infection. Prevention centers on timely penicillin during labor.
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Key points
Understand these first
All pregnant clients are screened with a vaginal-rectal culture at 36 to 37 weeks gestation.
GBS-positive clients receive IV antibiotic prophylaxis during labor, ideally at least 4 hours before delivery.
Intravenous penicillin G is the first-line agent; ampicillin is an alternative, and cefazolin or clindamycin/vancomycin are used for penicillin allergy.
Treatment is given during labor, not during pregnancy, because colonization can recur.
Risk factors warranting treatment without a culture include preterm labor, ruptured membranes over 18 hours, maternal fever, or a previous GBS-affected infant.
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Nursing priorities
What to do, in order
Identify GBS status on admission and initiate IV antibiotics promptly once labor begins or membranes rupture.
Time antibiotic administration to achieve at least 4 hours of coverage before delivery when possible.
Monitor the newborn for signs of early-onset sepsis after birth.
Document the number of antibiotic doses and the timing relative to delivery for the newborn team.
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Red flags — report now
Escalate immediately
Newborn temperature instability, grunting, poor feeding, or lethargy may indicate GBS sepsis and require immediate evaluation.
Delaying or omitting intrapartum antibiotics in a GBS-positive client increases the risk of neonatal sepsis.
Maternal fever in labor with GBS colonization signals possible chorioamnionitis and must be reported.
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Labs & values
Numbers to know
GBS vaginal-rectal culture: collected at 36 to 37 weeks; positive result indicates intrapartum prophylaxis is needed
Newborn CBC and blood cultures if sepsis is suspected
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Patient teaching
What patients must know
A positive GBS test does not mean you are sick; antibiotics during labor protect your baby.
Go to the hospital promptly when your water breaks or labor starts so antibiotics can be started in time.
GBS status can change, so screening is repeated with each pregnancy.
❓ Group B Streptococcus: NCLEX FAQs
What are the priority nursing interventions for Group B Streptococcus?
Identify GBS status on admission and initiate IV antibiotics promptly once labor begins or membranes rupture. Time antibiotic administration to achieve at least 4 hours of coverage before delivery when possible. Monitor the newborn for signs of early-onset sepsis after birth. Document the number of antibiotic doses and the timing relative to delivery for the newborn team.
What are the warning signs of Group B Streptococcus a nurse must report?
Newborn temperature instability, grunting, poor feeding, or lethargy may indicate GBS sepsis and require immediate evaluation. Delaying or omitting intrapartum antibiotics in a GBS-positive client increases the risk of neonatal sepsis. Maternal fever in labor with GBS colonization signals possible chorioamnionitis and must be reported.
What do I need to know about Group B Streptococcus for the NCLEX?
All pregnant clients are screened with a vaginal-rectal culture at 36 to 37 weeks gestation. GBS-positive clients receive IV antibiotic prophylaxis during labor, ideally at least 4 hours before delivery. Intravenous penicillin G is the first-line agent; ampicillin is an alternative, and cefazolin or clindamycin/vancomycin are used for penicillin allergy. Treatment is given during labor, not during pregnancy, because colonization can recur.
What patient teaching is important for Group B Streptococcus?
A positive GBS test does not mean you are sick; antibiotics during labor protect your baby. Go to the hospital promptly when your water breaks or labor starts so antibiotics can be started in time. GBS status can change, so screening is repeated with each pregnancy.
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Quick Tip
All pregnant clients are screened with a vaginal-rectal culture at 36 to 37 weeks gestation.