Line Blot Analysis for Viral Immunoglobulin G (IgG) Antibodies
This test detects specific antibodies in your blood that may indicate past exposure to certain viruses, such as those in the herpesvirus family. It helps confirm infections or assess immune responses.
["This test can help diagnose or monitor conditions linked to viral infections where IgG antibodies are relevant."]
Key facts at a glance
- LOINC
- 93745-8
- Short code
- HTLV I+II IgG CSF Ql Line blot
- Synonyms
- HTLV I+II IgG CSF Ql Line blot
- Category
- chemistry
- Sample
- csf
- Container
- Sterile tube
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- line-blot
- CPT
- 82784
- Specimen volume
- 1-2 mL
- Stability
- Immediate analysis required, Refrigerated: 1h
- Hemolysis max
- 200
- TAT
- 4–24 hours
- Order
- routine
What This Test Measures
The line blot assay detects IgG antibodies against specific viral antigens. These antibodies are part of your immune system’s response to infections. The test uses a visual line pattern to show the presence of these antibodies, which can indicate exposure to viruses like herpes simplex virus (HSV) or varicella-zoster virus (VZV).
How the Test Works
A small blood sample is taken and tested using a line blot immunoassay. The sample reacts with viral antigens on a membrane, creating visible lines if antibodies are present. This method is sensitive and can detect low levels of antibodies that might not be found in other tests.
When You Might Need This Test
Your healthcare provider may order this test if you have symptoms of viral infections, if you’ve been exposed to a virus, or if you need to confirm a diagnosis of conditions like herpes or shingles. It’s also sometimes used in research or specialized diagnostic settings.
Preparation for the Test
No special preparation is needed for this test. You may have a small needle inserted into your arm to draw blood, similar to other blood tests. If you’re on blood thinners or have a history of bleeding issues, let your provider know.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance
Short name
IgG Line Blot Test
Frequently asked questions
Why might this test be important?
How long will results take?
What does a positive or negative result 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