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Paratyphoid A bacterial culture (serum/plasma)

Published: August 9, 2026Updated: August 16, 2026

This test checks for the presence of *Salmonella Typhi* or *Salmonella Paratyphi A*—bacteria linked to typhoid fever or paratyphoid—a serious infection spread through contaminated food/water.

Quick summary

["Helps diagnose typhoid/paratyphoid fever by detecting bacteria in your bloodstream."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
20892-6
Short code
M avium paraTB Tiss Ql Cult
Synonyms
M avium paraTB Tiss Ql Cult
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
organism-specific-culture
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Matters

Typhoid and paratyphoid fever can cause high fever, stomach pain, weakness, and sometimes life-threatening complications if untreated. Early detection through blood culture helps doctors start the right antibiotics quickly.

How the Test Works

A small blood sample is drawn and placed in a sterile culture medium. If bacteria are present, they grow over days to weeks, allowing lab technicians to identify the specific strain.

Sample Collection

Blood is taken from a vein in your arm by a healthcare provider. You may feel a brief pinch, but it’s usually over quickly. No special preparation is needed.

Test Results & Next Steps

Results take days to weeks. If bacteria are found, you’ll likely receive antibiotics tailored to the identified strain. If negative, further testing (like stool samples) may be needed to confirm infection.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: This test is critical for diagnosing typhoid/paratyphoid fever, guiding antibiotic treatment, and preventing spread in outbreaks. It’s especially important in regions with limited access to other diagnostic tools.

Short name

Paratyphoid A blood culture

Frequently asked questions

How long does it take to get results?
Results typically take 2–14 days, depending on lab workload. Some labs may use rapid methods like blood culture screening, but full identification can take longer.
What if I have a mild fever but no symptoms?
If you’re exposed to someone with typhoid/paratyphoid fever or live in a high-risk area, this test helps rule out infection. Mild fevers can sometimes be due to other causes, so your doctor may recommend additional tests.
Can I eat or drink before the test?
No special preparation is needed. However, avoid alcohol or heavy meals 1–2 hours before the blood draw to ensure accuracy.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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