Pleural Fluid Aerobic Bacterial Culture: Testing Chest Fluid for Bacterial Infection
A pleural fluid aerobic bacterial culture is a laboratory test that checks a sample of fluid collected from around your lungs to find out whether a bacterial infection is present.
{通过培养胸腔积液样本识别致病细菌,帮助诊断胸膜感染或肺炎并发胸腔积液,指导抗生素选择和治疗方案,结果通常需要2-5天出具,采样过程需由医生使用胸腔穿刺术完成}
Key facts at a glance
- LOINC
- 17279-1
- Short code
- PLEURCULT
- Synonyms
- Bacteria Plr Aerobe Cult
- Category
- chemistry
- Sample
- fluid
- Container
- Sterile, leak-proof, screw-cap container or aerobic blood culture bottle. For anaerobic culture, additional anaerobic transport vial required (though this test specifies aerobe culture only).
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- ≥ 0 years
- Method
- aerobic-culture
- CPT
- 87070
- SNOMED
- 41216001
- Specimen volume
- Minimum 1-5 mL of pleural fluid. Larger volumes (10-50 mL) preferred for optimal pathogen recovery. If inoculation into blood culture bottles, follow manufacturer-specified volume requirements (typically 5-10 mL per bottle).
- Stability
- Room temperature: process immediately, ideally within 2 hours of collection. Refrigerated (2-8°C): acceptable for up to 24 hours if processing delay unavoidable. Inoculated blood culture bottles: stable per manufacturer specifications (typically up to 5 days at room temperature in automated systems).
- Hemolysis max
- 300
- TAT
- 24–120 hours
- Order
- routine
What is this test?
A pleural fluid aerobic bacterial culture is a microbiology test used to find out whether aerobic bacteria, which are germs that grow in oxygen, are present in the fluid that collects around your lungs. Your doctor withdraws a sample of this fluid through a procedure called thoracentesis and sends it to the laboratory, where it is cultured so that any bacteria can grow and be identified. This test helps determine whether the lining around your lungs is infected and identifies the specific type of bacteria causing the infection.
Why do I need this test?
If you have pleural effusion, meaning fluid building up around your lungs, your doctor needs to find out whether that fluid is caused by an infection. This test is especially useful when pneumonia has produced fluid in the chest space, or when pleurisy or empyema is suspected. Identifying the exact bacteria responsible allows your doctor to choose the most effective antibiotic for you, which improves your chances of a successful treatment.
What happens during the procedure?
Your doctor will numb the area with a local anesthetic and use a thin needle to withdraw a sample of fluid from your chest. The procedure is usually performed with ultrasound guidance to keep it safe and accurate. The sample is sent to the laboratory right away, where it is placed on culture media that support the growth of aerobic bacteria and kept in an incubator for several days while the lab watches to see whether any bacteria grow.
Understanding your results
If your culture is positive, it means bacteria were found in the pleural fluid and an infection is present. Your doctor will then run susceptibility testing to see which antibiotics work best against the specific bacteria identified. If your culture is negative, it may mean there is no bacterial infection, or that the cause is an organism that is difficult to grow in the laboratory, or that antibiotics you were already taking suppressed bacterial growth.
Reference range
No growth of pathogenic aerobic bacteria. Normal pleural fluid is sterile. Commensal or environmental organisms should be correlated with clinical findings.N/A
No fasting required. Patient should be informed about the thoracentesis procedure. Informed consent must be obtained prior to pleural fluid collection. Discontinuation of antibiotics prior to collection should be discussed with the ordering physician, as prior antimicrobial therapy may affect culture yield.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
胸腔积液需氧菌培养对诊断复杂性肺炎旁胸腔积液和脓胸至关重要。阳性结果可明确感染病原体，指导针对性抗感染治疗。常见的致病菌包括肺炎链球菌、金黄色葡萄球菌、克雷伯菌属等。阴性结果虽不能完全排除感染，但有助于区分感染性与非感染性积液，为治疗决策提供重要依据。
Frequently asked questions
Do I need to fast or stop taking any medications before the test?
Are there any risks with this test?
Why does it take so long to get my results?
What happens if my culture comes back negative?
Sources
- 1
- 2
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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