Alpha-Internexin IgG, Cerebrospinal Fluid — Qualitative, Immunoassay
A qualitative CSF test that detects IgG associated with alpha-internexin, a nervous-system protein.
["This test checks whether alpha-internexin IgG is present in cerebrospinal fluid."]
Key facts at a glance
- LOINC
- 96482-5
- Short code
- Alpha-internexin IgG CSF Ql CBA IFA
- Synonyms
- Alpha-internexin IgG CSF Ql CBA IFA
- Category
- liver
- Sample
- csf
- Container
- Sterile tube
- Units
- N/A
- Ref low
- 44
- Ref high
- 147
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- cba-ifa
- CPT
- 84075
- SNOMED
- 27550007
- Specimen volume
- 1-2 mL
- Stability
- Immediate analysis required, Refrigerated: 1h
- Hemolysis max
- 200
- TAT
- 4–24 hours
- Order
- routine
What is this test?
This is a qualitative laboratory test of cerebrospinal fluid, or CSF. It uses an immunoassay to detect IgG associated with alpha-internexin, a protein found in nervous-system cells.
Why might I need this test?
This test may be considered in selected evaluations of neurologic symptoms when a clinician suspects an immune-related condition. It is not a general screening test and is usually interpreted along with symptoms, examination findings, and other laboratory results.
How is the test performed?
A small sample of CSF is collected through a lumbar puncture, also called a spinal tap. The laboratory then uses an immunoassay to determine whether alpha-internexin IgG can be detected.
How do I prepare for the test?
There are usually no special preparation instructions beyond following your clinician's directions. Because lumbar puncture involves a needle, tell the healthcare team about any bleeding problems, blood-thinning medicines, back problems, or previous reactions to local anesthetic.
Reference range
Adult: 44-147 U/LN/A
No special preparation required. Avoid fatty meals before the test if possible.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
A positive result means alpha-internexin IgG was detected in the CSF. In the appropriate clinical context, this may support an immune-mediated neurologic process, but it is not diagnostic by itself and can have different significance depending on the assay and condition being evaluated. A negative result does not completely exclude the condition because testing sensitivity is limited.
Short name
CSF Alpha-Internexin IgG
Frequently asked questions
Is this the same as a routine blood test?
What does a positive result mean?
Does a negative result rule out a neurologic condition?
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