Serum or Plasma Immunoassay for Anti-Protein A Antibodies (Qualitative)
This test checks for the presence of antibodies that bind to Protein A, a protein found on some bacteria like *Staphylococcus*. It helps identify infections caused by these bacteria, such as skin or soft tissue infections.
["This test can help diagnose infections linked to *Staphylococcus* bacteria, guiding treatment decisions."]
Key facts at a glance
- LOINC
- 104512-9
- Short code
- Jo sup(a) Ab Titr SerPl
- Synonyms
- Jo sup(a) Ab Titr SerPl
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- 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
When Is This Test Done?
Your doctor may order this test if you have symptoms of a bacterial infection—such as fever, redness, swelling, or pus—and suspect a *Staphylococcus* infection, like an abscess or cellulitis. It may also be used in research or specialized diagnostic settings.
How Is the Sample Collected?
A blood sample is drawn from a vein, usually in your arm. The blood is processed to separate serum or plasma for testing.
What Does a Positive Result Mean?
A positive result means your body has produced antibodies against Protein A, suggesting a current or recent *Staphylococcus* infection. This does not confirm the specific type of bacteria but supports the need for further evaluation or treatment.
What Does a Negative Result Mean?
A negative result means no detectable antibodies were found, which may indicate no active *Staphylococcus* infection or that the test was not performed under the right conditions.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance: This test is primarily used in research or specialized settings to detect infections caused by *Staphylococcus* bacteria, which can cause serious skin, soft tissue, or systemic infections. It is not routinely used in standard clinical practice due to limited availability and specificity.
Short name
Anti-Protein A Antibodies (Qual)
Frequently asked questions
Why might my doctor order this test?
What are the typical symptoms of a *Staphylococcus* infection that might lead to this test?
Are there any risks or side effects from this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 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