What is the Culture Fluid?
Culture-fluid testing is the process of placing microorganisms from various body fluids in a growth medium to identify them. Such fluids include; blood, urine, cerebrospinal fluid (CSF), pleural fluid, peritoneal fluid, synovial (joint) fluid, and others. It is used in the diagnosis of bacterial, viral, or fungal infections which may not be evident in other ways.
This test is particularly valuable in the diagnosis of serious infections, including septicemia (blood poisoning), meningitis (inflammation of the membranes surrounding the brain and spinal cord), peritonitis (inflammation of the abdominal cavity), pneumonia, and urinary tract infections (UTIs). When infection is suspected, a sample of fluid from the affected part is obtained and put in a medium to support the growth of any present bacteria, fungi, or other pathogens. Thus, based on the microorganisms present, medical practitioners can guess the kind of infection and the best treatment to recommend. A culture-fluid test is often accompanied by sensitivity testing which defines the appropriate antibiotics or antifungals that should be used in the management of the infection. This ensures that the treatment is specifically directed at the problem, thus avoiding the use of broad-spectrum antibiotics which can cause the development of antibiotic resistance.
How is the Test Performed?
Preparation
- No special preparations are required for the test
- Avoid using antibiotics or eardrops 3 hours before the test.
Collection
The collection procedure is dependent on the type of the test.
- For Blood Culture a small amount of blood is drawn from the vein through the process of venipuncture
- Urine culture test involves the collection of the urine sample in culture bottles containing nutrient medium
- A lumbar puncture is done in the spinal canal for the collection of the cerebrospinal fluid culture
- Peritoneal or Pleural Fluid Culture is collected by the withdrawal of the fluid from the pleural or peritoneal cavity with the help of a sterile needle
- While using a sterile needle, a sample is drawn from the joint for the synovial fluid culture
Laboratory Analysis
- The sample is analyzed in the laboratory by placing it in the incubator to allow the bacteria or microorganisms to grow and is then examined under a microscope.
What are the symptoms that prompt this test?
The healthcare provider may warrant this test if you are exhibiting the symptoms associated with blood infection, urinary tract infection, meningitis, infections of the respiratory tract, the infections of the joints.
Symptoms Associated with Sepsis
- High-grade fever followed by chills
- Fast heartbeat
- Hypotension
- Confusion
- Breathing difficulty
Symptoms Associated with Urinary Tract Infection
- Urinating with pain and increased frequency
- Urine with a cloudy appearance and a foul smell
- Lower abdominal pain
- Fever
Symptoms Associated with Meningitis
- Extreme Headache
- Neck stiffness
- Vomiting or nausea
- Light sensitivity
- Change in mental status
General Symptoms
- Fever
- Pain
- Swelling
- Redness
- Discharge from the site of infection
- Itchy rash
What are Normal Ranges for This Test?
The culture fluid test is a qualitative test indicating the presence or absence of pathogens.
Positive – Presence of microbial growth
Negative – Absence of microbial growth
**The result interpretation depends on the type of microbes and the associated symptoms. Always consult your healthcare provider for accurate interpretation of results.. **
What Happens if Test Results Show Abnormal Levels?
If the test results indicate the presence of infection or pathogens, early treatment is crucial. The treatment results are based on the type of the microbe.
Bacterial Infection
Antibiotics are prescribed such as penicillin and cephalosporin.
Fungal Infection
Antifungal medications are given including fluconazole and amphotericin B.
Viral Infection
Antiviral medications are prescribed for herpes or influenza including acyclovir.
Severe Cases
In extreme cases hospitalization is required for intravenous administration of the virus.
