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Bacteriafldcult

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

This test identifies bacteria present in body fluids to diagnose infections.

Quick summary

{"A bacterial culture test detects harmful bacteria in body fluids","Helps doctors identify the specific cause of infections","Guides appropriate antibiotic treatment","Results typically take 2-5 days","Sample is collected by needle from the infection site"}

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

Key facts at a glance

LOINC
611-4
Short code
BACIDBF
Synonyms
Bacteria Fld Cult
Category
chemistry
Sample
serum
Container
Sterile, leak-proof container appropriate for body fluid collection; blood culture bottles (aerobic and anaerobic) may be used for certain fluid types. Transport medium as required by specimen type. Do not use formalin or preservatives.
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
0–120 years
Method
culture
CPT
87070
SNOMED
104182007
Specimen volume
Minimum 1-10 mL depending on fluid type (e.g., 1 mL for CSF, 5-10 mL for synovial, pleural, peritoneal fluids). Larger volumes preferred for optimal recovery of organisms.
Stability
Transport to laboratory as soon as possible, ideally within 1-2 hours of collection at room temperature. If delayed, store at room temperature (20-25°C) for up to 24 hours. Do not refrigerate body fluid cultures as some pathogens (e.g., Neisseria, Haemophilus) are cold-sensitive. For blood culture bottles, follow manufacturer specifications.
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
48–168 hours
Order
routine

What is this test?

A bacterial culture test is a laboratory procedure that identifies bacteria present in body fluids such as cerebrospinal fluid, pleural fluid, peritoneal fluid, or joint fluid. The sample is collected from the affected area using a needle and sent to the laboratory where it is placed in a special environment that allows bacteria to grow. Once bacteria are detected, further testing identifies the specific type and determines which antibiotics will be most effective.

Reference range

No growth of pathogenic bacteria. Normal flora reported as such when clinically appropriate. Results reported as organism identified with colony description and quantification where applicable.N/A

Specimen: serum

No special patient preparation required. Specimen collection should be performed using aseptic technique to avoid contamination. Disinfection of the collection site with appropriate antiseptic (e.g., chlorhexidine or povidone-iodine) is essential. Collect prior to initiation of antimicrobial therapy whenever possible. If patient is on antibiotics, document the specific agents and timing of last dose.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

How is the sample collected?
A healthcare provider will use a needle to withdraw fluid from the affected area, such as the spinal canal (lumbar puncture), chest cavity (thoracentesis), abdominal cavity (paracentesis), or joint space. The procedure is performed under sterile conditions to prevent contamination.
How long does it take to get results?
Preliminary results may be available in 24-48 hours. Complete results, including bacterial identification and antibiotic sensitivity testing, typically take 3-5 days. Some bacteria require longer incubation periods.
Does this test hurt?
You may feel some discomfort or pressure during the needle insertion. The area will be cleaned and numbed with a local anesthetic to minimize pain. The level of discomfort varies depending on the collection site.
What do the results mean?
A positive result means bacteria were found in the fluid, indicating a bacterial infection. The report will identify the specific bacteria and which antibiotics can treat it. A negative result may mean no infection is present, or the infection is caused by viruses or other organisms not detected by this test.
Are there any risks to this test?
Risks are minimal but may include bleeding, infection, or discomfort at the puncture site. For lumbar puncture, there may be a headache afterward. Your healthcare provider will discuss specific risks based on your individual situation.
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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