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Streptococcus group B (GBS) bacterial culture and sensitivity (blood) with probe-based detection

Published: August 9, 2026Updated: August 16, 2026

This test checks for the presence of *Streptococcus group B* bacteria in your blood and determines how your body might respond to treatment.

Quick summary

["Helps identify infections caused by GBS that could require antibiotics or further medical evaluation."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
88269-6
Short code
S aureus gyrB Bld Pos Ql Probe
Synonyms
S aureus gyrB Bld Pos Ql Probe
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What This Test Measures

This test involves drawing blood to detect *Streptococcus group B* bacteria, which can cause serious infections in some people. A specialized probe detects bacterial presence and measures how your immune system might react to treatment (e.g., antibiotic sensitivity).

Why It’s Done

Your healthcare provider may order this test if you have symptoms of infection (e.g., fever, chills) or if you’re at higher risk of GBS-related complications, such as during pregnancy or after surgery.

How It Works

Blood is collected and cultured to grow bacterial colonies. A probe detects bacterial DNA or proteins, and results assess potential antibiotic resistance patterns.

What to Expect

You’ll receive instructions to prepare (e.g., fasting or avoiding certain medications). Results may take days to weeks, depending on lab methods.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

GBS Blood Culture Screening

Frequently asked questions

This test helps diagnose infections caused by *Streptococcus group B*, which can affect the blood, uterus, or other organs. Early detection allows for targeted treatment to prevent severe illness or complications.
This test may not show *Streptococcus group B* in every case, even if infection is present. Results depend on lab sensitivity and probe accuracy. Follow-up testing may be needed if initial results are unclear.
How long will I need to wait for results?
Results can take several days to a few weeks, depending on the lab’s processing time and method. Your healthcare provider will contact you once they’re ready.
Can I eat or drink before this test?
You may follow standard fasting guidelines if instructed, but check with your provider for specific instructions. Avoid alcohol or certain medications if directed.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy