Understanding Your Laboratory Test: Purpose, Sample Collection, and Lab Analysis
A laboratory test that identifies bacteria causing infection in a surgical wound.
{"This test detects and identifies bacteria from a surgical wound sample","Results help doctors choose the right antibiotic treatment","Sample is collected from the wound using a swab or tissue","Results typically take 2-5 days to complete","Positive results confirm a bacterial infection"}
Key facts at a glance
- LOINC
- 105924-5
- Short code
- SWDCUL
- Synonyms
- Bacteria Surgical wound Cult
- Category
- chemistry
- Sample
- serum
- Container
- Sterile screw-cap container or transport swab system (e.g., Amies or Stuart transport medium) for tissue or fluid samples. Anaerobic transport container required if anaerobes are suspected.
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 0–120 years
- Method
- culture
- CPT
- 87070
- SNOMED
- 441829007
- Specimen volume
- Submit aspirated fluid (≥1 mL), tissue (≥1 cm³ or equivalent), or purulent material in sufficient quantity for culture. Multiple swab sites may be submitted if infection is multifocal.
- Stability
- Room temperature: deliver to laboratory within 2 hours. Refrigerated (4°C): stable up to 24 hours for aerobic culture. For anaerobic culture, maintain at room temperature and process within 2 hours of collection.
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 48–168 hours
- Order
- routine
This laboratory test helps your healthcare provider evaluate important aspects of your health. It can be used to screen for certain conditions, help confirm a diagnosis, monitor an ongoing medical problem, or guide treatment decisions. Your provider ordered this test to gather specific information that supports accurate, personalized care, and your results will be interpreted together with your symptoms, medical history, and physical examination.
The Surgical Wound Culture test is a laboratory procedure that collects a sample from a surgical wound to identify any bacteria present. The sample is placed in special growth media to allow bacteria to multiply, making them easier to identify. This helps your healthcare provider determine if your wound is infected and which specific bacteria are causing the infection.
A trained healthcare professional will collect your sample, most often a small amount of blood drawn from a vein in your arm using a sterile needle. The procedure usually takes only a few minutes, and you may feel a brief pinch or sting at the needle site. Depending on the test, you may be asked to fast for several hours beforehand or to avoid certain medications. After collection, the sample is carefully labeled and sent to the laboratory for processing.
A healthcare professional will gently swab the wound or collect a small tissue sample from the infected area. The sample is then placed in a sterile container and sent to the laboratory for analysis. The collection process is quick and may cause mild discomfort.
Once your sample arrives at the laboratory, trained technicians log it in, verify your identifying information, and prepare it for analysis. Specialized instruments measure the values your provider ordered, and strict quality-control procedures are followed at every step to ensure accuracy. A laboratory professional reviews and validates the results before releasing them to your healthcare provider, who will contact you to discuss what the findings mean for your health.
In the lab, the sample is cultured (placed in conditions that allow bacteria to grow). Technicians then identify the specific types of bacteria present and may perform additional tests to determine which antibiotics will be most effective in treating the infection (this is called antibiotic susceptibility testing).
Reference range
No growth of pathogenic bacteria. Normal skin flora may be reported when clinically relevant. Results expressed as organism identified, quantity (semiquantitative: rare, few, moderate, many), and antibiotic susceptibility profile when indicated.N/A
Discontinue topical antibiotics, antiseptic solutions, and wound cleansers for at least 24 hours prior to specimen collection when clinically feasible. The wound surface should be cleaned and debrided of superficial exudate before sampling to avoid contamination with colonizing flora.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test is crucial for diagnosing wound infections after surgery. A positive result confirms bacterial infection and identifies the exact bacteria causing it. This information allows doctors to prescribe targeted antibiotic therapy rather than using broad-spectrum antibiotics, which helps combat antibiotic resistance. The test also helps monitor the effectiveness of treatment and guide decisions about wound care management.
Frequently asked questions
How long does it take to get results?
Does a positive result always mean I have an infection?
Do I need to prepare for this test?
What happens if no bacteria are found?
Sources
- 1
- 2
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.
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