Bacteriatpncult
This test checks if bacteria are growing in the liquid nutrition (TPN) given through your vein.
{"TPN provides nutrition directly into your bloodstream when you cannot eat normally","This test looks for harmful bacteria that might contaminate the TPN solution","Results help doctors prevent serious infections from contaminated nutrition","The TPN solution itself is tested, not your blood","Regular testing helps keep TPN therapy safe"}
Key facts at a glance
- LOINC
- 58940-8
- Short code
- TPNBCID
- Synonyms
- Bacteria TPN Cult
- Category
- chemistry
- Sample
- serum
- Container
- Sterile aerobic and anaerobic blood culture bottles (e.g., BacT/ALERT, BACTEC); standard paired blood culture set with at least one aerobic and one anaerobic bottle per draw site.
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 0–120 years
- Method
- culture
- CPT
- 87040
- SNOMED
- 252450000
- Specimen volume
- 8-10 mL per blood culture bottle (adult); 1-3 mL per bottle (pediatric); total volume 20-30 mL per set from two separate venipuncture sites.
- Stability
- Blood culture bottles should be transported to the laboratory immediately or incubated within 2 hours of collection. If immediate transport is not possible, bottles may be held at room temperature (20-25°C) for up to 2 hours. Once inoculated, bottles must not be refrigerated. Isolated organisms on solid media are stable at 2-8°C for several days; subcultures may be frozen at -70°C in appropriate cryopreservation media for long-term storage.
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 24–168 hours
- Order
- routine
What is this test?
This test checks your Total Parenteral Nutrition (TPN) solution for bacteria. TPN is a special liquid food that goes directly into your blood through a vein. It provides calories, protein, vitamins, and other nutrients when you cannot eat normally due to illness or surgery.
Why is it important?
Bacteria can sometimes get into TPN solutions during preparation or handling. If contaminated TPN enters your bloodstream, it can cause a serious infection. This test helps catch contamination early so doctors can prevent dangerous bloodstream infections.
How is the test done?
A small sample of your TPN solution is collected and sent to the laboratory. In the lab, the sample is placed in special containers that allow bacteria to grow if present. Technicians check daily to see if any bacteria appear. This process can take several days.
What do the results mean?
A negative result means no bacteria were found in your TPN solution - this is good news. A positive result means bacteria were found, and your healthcare team will determine the specific type and the best treatment to keep you safe.
Reference range
Negative for pathogenic bacteria. Reportable organisms may include: coagulase-negative Staphylococcus, Staphylococcus aureus, Enterococcus species, Klebsiella species, Enterobacter species, Serratia marcescens, Acinetobacter species, Pseudomonas aeruginosa, and other Gram-negative bacilli. Results are reported qualitatively as organism identified or no growth.N/A
No special patient preparation required prior to specimen collection. For patients receiving total parenteral nutrition (TPN), sample collection should be coordinated with clinical signs of suspected bloodstream infection (fever, chills, hypotension) to maximize diagnostic yield. Aseptic technique is mandatory during collection to prevent contamination.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test is crucial for patient safety. Contaminated TPN can lead to bloodstream infections (sepsis), which can be life-threatening, especially in patients with weakened immune systems. Regular testing of TPN solutions helps ensure the safety of this essential nutrition therapy. Early detection of contamination allows for immediate intervention, potentially preventing serious complications.
Frequently asked questions
Is my blood being tested?
How long does it take to get results?
Will I know if my TPN is contaminated?
What happens if bacteria are found?
Who needs TPN?
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