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Streptococcus throat culture (with antimicrobial susceptibility testing)

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

This test checks for bacteria, including *Streptococcus* (such as group A), that may cause throat infections like strep throat. It also helps determine which antibiotics could be most effective if treatment is needed.

Quick summary

["A throat culture helps diagnose infections and guides antibiotic choices."]

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

Key facts at a glance

LOINC
11268-0
Short code
S pyo Throat Ql Cult
Synonyms
S pyo Throat Ql Cult
Category
coagulation
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
organism-specific-culture
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your doctor may recommend a throat culture if you have symptoms like sore throat, fever, swollen lymph nodes, or difficulty swallowing. It’s especially useful for diagnosing strep throat, which can lead to complications if untreated.

How Is the Test Performed?

A swab is gently taken from the back of your throat and neck. The swab is placed in a special container and sent to the lab. No special preparation is needed, but avoid eating, drinking, or brushing your teeth for 30 minutes before the test.

What Does the Test Show?

The lab grows bacteria from the swab on a special medium over 24–48 hours. If bacteria are found, they are identified (e.g., *Streptococcus pyogenes*), and their sensitivity to antibiotics is tested. Results help determine if antibiotics are needed and which ones to use.

What If the Test Is Positive?

A positive result means bacteria were detected. This often indicates strep throat or another bacterial infection. Your doctor will decide whether to start antibiotics to prevent complications like rheumatic fever or scarlet fever.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Throat Culture

Frequently asked questions

How long does it take to get the results?
Results typically take 24–48 hours, depending on lab processing. Some labs may provide preliminary findings sooner, but final reports may take longer.
What if I have allergies to antibiotics?
If you have known allergies to antibiotics, let your doctor know immediately. They may choose a different antibiotic or adjust the treatment plan based on the culture results and your allergy history.
Can I still spread the infection if I have symptoms?
Yes, strep throat is highly contagious. Antibiotics help stop the spread, but it’s important to avoid close contact with others until you’re no longer contagious (usually after starting treatment for 24 hours).
  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