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Bacteriological Culture of Blood with Qualitative Identification of Organisms and Antibiotic Susceptibility Testing (Serum/Plasma)

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

This test checks for bacteria or fungi in your bloodstream by growing them in a lab. It helps determine if an infection is present and guides treatment with antibiotics.

Quick summary

["Identifies potential blood infections and helps choose the right antibiotics."]

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

Key facts at a glance

LOINC
547-0
Short code
B-Hem Strep Spec Ql Cult
Synonyms
B-Hem Strep Spec 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

What This Test Does

A blood culture involves taking a sample of your blood and growing it in special containers to see if any microorganisms (like bacteria or fungi) are present. If bacteria or fungi are found, the lab will also test them to see which antibiotics might work best against them.

How the Test Works

Your blood sample is placed in a sterile environment where microorganisms, if present, will grow over time. This process helps identify the type of infection and guides medical decisions.

When You Might Need This Test

Blood cultures are often recommended if you have symptoms like fever, chills, or unexplained infections, especially after surgery, trauma, or if you have a weakened immune system.

Preparation for the Test

No special preparation is needed. You may have a small needle inserted into a vein to draw blood, which might cause a brief pinch or discomfort.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Blood Culture Screen

Frequently asked questions

Why is this test important?
This test is crucial for diagnosing blood infections (sepsis) and ensuring the correct antibiotics are used to treat them. It helps prevent unnecessary antibiotic use and reduces the risk of antibiotic resistance.
How long does it take to get results?
Results can take several days, as the microorganisms need time to grow in the lab. Your healthcare provider will discuss the findings with you once they are ready.
What if my blood culture comes back positive?
If bacteria or fungi are found, your doctor will work with the lab to determine the best treatment plan, which may include antibiotics or other medications tailored to your specific infection.
  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