Bacterial Culture Test for Detecting Bacterial Infections
A laboratory test that detects and identifies bacteria in blood products before transfusion to ensure patient safety.
{"This test checks blood products (like donated blood) for bacterial contamination","It helps prevent serious infections that could be transmitted through blood transfusions","Samples are taken from blood bags and cultured in a laboratory to grow and identify any bacteria","This is a critical safety step before blood products are used for transfusions","If bacteria are found, the blood product is discarded and not used for patients"}
Key facts at a glance
- LOINC
- 68366-4
- Short code
- BBBLDCUL
- Synonyms
- Bacteria BPU Cult
- Category
- chemistry
- Sample
- whole-blood
- Container
- Sterile blood culture bottles (aerobic and anaerobic) or sterile specimen container for blood product sample
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- culture
- CPT
- 87040
- SNOMED
- 104235005
- Specimen volume
- 1-10 mL of blood product per culture bottle; typically 5-10 mL per bottle with paired aerobic and anaerobic bottles
- Stability
- Blood product cultures should be inoculated into culture media as soon as possible. If immediate inoculation is not possible, hold at room temperature (20-25°C) for no more than 2 hours. Do not refrigerate.
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 48–120 hours
- Order
- routine
This test checks a sample from your body, such as blood, urine, a wound swab, or throat swab, for the presence of bacteria. It helps your doctor determine whether an infection is causing your symptoms and identifies which type of bacteria may be responsible.
The Blood Product Bacterial Culture test is a laboratory test that checks donated blood products for the presence of bacteria. When you receive a blood transfusion, the blood must be completely free of harmful microorganisms. This test helps ensure that the blood product is safe by detecting any bacterial contamination before it is given to a patient.
A sample is collected based on where the infection is suspected, such as a urine sample, a blood draw, or a swab from a wound or throat. The sample is placed in a special culture container that encourages bacteria to grow, and laboratory specialists examine it over several days to see whether bacteria appear.
A small sample is taken from the blood product bag (such as packed red blood cells, platelets, or plasma). This sample is then placed in special culture bottles and incubated in a laboratory. Technicians monitor the sample over several days to see if any bacteria grow. If bacteria are detected, further testing identifies the specific type of bacteria present.
This test is important because it confirms whether bacteria are causing your illness and identifies the specific type involved. Knowing exactly which bacteria are present allows your doctor to select the most effective antibiotic, helping you recover faster and preventing complications from an untreated infection.
Bacterial contamination of blood products, though rare, can cause serious and potentially life-threatening infections in patients receiving transfusions. This test is a crucial safety measure that helps protect patients from transfusion-transmitted bacterial infections. It is standard protocol for all donated blood products before they are released for clinical use.
If bacteria are found, your doctor will review the results and may order additional testing to determine which antibiotics will work best against the specific organism. Treatment will be started or adjusted accordingly, and your care team will explain the findings, discuss next steps, and arrange follow-up to make sure the infection clears completely.
If bacteria are identified in a blood product, that unit is immediately removed from the blood bank inventory and discarded. The blood donation center is notified so they can investigate the source of contamination and ensure donor safety. The patient who was scheduled to receive that blood product will receive a safe unit instead.
Reference range
No growth of bacteria identified (negative result). Report indicates specific organism(s) isolated and identified if positive.N/A
No patient preparation required. This test is performed on blood product units (e.g., platelet units, RBC units) prior to or during transfusion. Donor unit and/or segment tubing is used for culture. Standard aseptic technique must be used when accessing the blood product unit to prevent contamination.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test is essential for blood safety and transfusion medicine. It helps prevent bacterial sepsis and other serious infections that can occur from contaminated blood products. Different bacteria can cause different types of infections, and identifying the specific organism helps guide treatment if a patient were to develop an infection despite screening.
Platelet products are particularly at risk for bacterial growth because they are stored at room temperature, which can allow bacteria to multiply. Therefore, bacterial testing is especially critical for platelet transfusions. This test represents a key quality assurance step in the blood supply chain, protecting vulnerable patients including those with weakened immune systems, cancer patients, and surgical patients.
Frequently asked questions
Does this test hurt?
Will I know if bacteria were found in the blood I received?
How long does this test take?
Is bacterial contamination common in blood donations?
Sources
- 1
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- 3
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