Direct Antigen Antibody Test for Polysaccharide Antigens in Plasma (e.g., *Group B Streptococcus* or *Other Pathogens*)
This test checks for antibodies against certain sugar-like molecules (polysaccharides) found on the surface of certain bacteria, such as those that may cause infections like Group B Streptococcus (GBS). It helps identify if your immune system has detected and responded to these bacteria.
["This test supports early detection of bacterial infections by measuring immune system reactions to specific bacterial antigens."]
Key facts at a glance
- LOINC
- 46274-7
- Short code
- DAT Poly-Sp Reag p transf rx RBC Ql
- Synonyms
- DAT Poly-Sp Reag p transf rx RBC Ql
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 4.2
- Ref high
- 5.9
- Critical range
- 2 N/A – 7 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 85041
- SNOMED
- 900000000000003001
- 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
What This Test Measures
The test detects the presence of antibodies (proteins produced by your immune system) that target specific polysaccharides from certain bacteria. These polysaccharides are part of the bacteria’s outer structure and can trigger an immune response. The test uses a method called **nephelometry** (measuring light scattering) to quantify these antibodies in your plasma sample.
Why It’s Done
Doctors may order this test to evaluate immune responses in patients at risk for bacterial infections, such as newborns, pregnant individuals, or those with weakened immune systems. It can also be used in research or diagnostic screening for certain bacterial pathogens.
Sample Collection and Preparation
A blood sample is drawn from a vein, typically in your arm. The blood is processed to separate plasma (the liquid part containing antibodies) for testing. This test is performed on plasma, not whole blood.
Common Uses and Clinical Context
This test is often used in research settings or specialized diagnostic scenarios to assess immune responses to specific bacterial antigens. It may also be part of broader investigations into infections or immune system function.
Reference range
Adult males: 4.2-5.9; Females: 3.8-5.1 x 10^12/LN/A
No special preparation required. Stay well hydrated.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
Direct Antigen Antibody Test for Bacterial Polysaccharides
Frequently asked questions
What does a positive result mean?
Is this test used for routine infections like strep throat or pneumonia?
How long does it take to get results?
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 17, 2026. · Read our editorial policy