Immunoglobulin A (IgA) by latex agglutination (screening test)
This test measures the level of Immunoglobulin A (IgA), a type of antibody in your blood. IgA helps protect your body from infections.
["IgA helps fight infections and supports immune function; low levels may indicate immune system issues."]
Key facts at a glance
- LOINC
- 105985-6
- Short code
- IgA lamba Ser Ql IFE
- Synonyms
- IgA lamba Ser Ql IFE
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- immunofixation
- CPT
- 82784
- 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 Does This Test Measure?
IgA is one of the key proteins in your immune system. It helps protect your body from harmful bacteria and viruses by binding to them. This test screens for IgA levels in your blood, which can help identify potential immune deficiencies or conditions like common variable immunodeficiency (CVID).
Why Might You Need This Test?
Your healthcare provider may order this test if you have symptoms like frequent infections, recurrent sinus or lung infections, or if you have a history of immune-related conditions. It may also be used as part of a broader evaluation for certain autoimmune diseases or to monitor immune function in certain treatments.
What to Expect Before the Test
No special preparation is usually needed for this test. You may have a small needle inserted into your arm to draw blood. If you are on blood thinners or have a history of bleeding issues, let your provider know beforehand.
What to Expect During the Test
The blood sample is collected and processed to detect IgA antibodies. The test uses a latex agglutination method, which involves mixing blood with latex particles coated with IgA antibodies. If IgA is present, the particles clump together, indicating a positive result.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Low IgA levels may suggest an immune deficiency, such as selective IgA deficiency, which can increase susceptibility to infections. High IgA levels might be seen in certain autoimmune conditions or chronic infections. This test is often used as a screening tool and may be followed by more specific tests if abnormalities are detected.
Short name
IgA screening
Frequently asked questions
What Are Normal IgA Levels?
What Does a Low IgA Level Mean?
What Does a High IgA Level Mean?
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