ATXN2 (ataxin 2) (eg, spinocerebellar ataxia) gene analysis, evaluation to detect abnormal (eg, expanded) alleles
CPT4 code
Name of the Procedure:
Ataxin 2 (ATXN2) Gene Analysis, Evaluation to Detect Abnormal (eg, Expanded) Alleles
Summary
Ataxin 2 gene analysis is a genetic test used to detect abnormalities in the ATXN2 gene, which are often linked to spinocerebellar ataxia (a progressive, degenerative disease affecting the brain and spinal cord). This test identifies abnormal expansions in the gene sequence that can cause the condition.
Purpose
The procedure addresses spinocerebellar ataxia and other conditions linked to abnormalities in the ATXN2 gene. The goal is to confirm a diagnosis, assess the risk of developing the disease, and guide treatment or family planning decisions.
Indications
This procedure is indicated for individuals exhibiting symptoms such as:
- Uncoordinated movements
- Balance and speech difficulties
- Family history of spinocerebellar ataxia or related disorders It is also appropriate for patients with unexplained ataxia or those seeking genetic counseling about their risk.
Preparation
Patients typically do not need to fast or adjust medications before the test. However, providing a detailed family medical history and undergoing a clinical assessment may be required.
Procedure Description
- Sample Collection: A blood sample is collected from the patient, usually from a vein in the arm.
- DNA Extraction: DNA is extracted from the blood sample in a laboratory.
- Gene Analysis: Modern laboratory techniques, such as PCR (Polymerase Chain Reaction) and Southern blotting, are used to analyze the ATXN2 gene for abnormalities or expansions in its sequence. A local anesthetic may be applied to the blood draw site if needed, but no general anesthesia or sedation is necessary.
Duration
The blood sample collection takes about 10-15 minutes. The gene analysis process in the laboratory may take several days to a few weeks.
Setting
The blood sample is usually collected in an outpatient clinic or a hospital. The gene analysis is performed in a specialized genetic testing laboratory.
Personnel
- Phlebotomists (for blood sample collection)
- Laboratory technicians or geneticists (for conducting and analyzing the gene test)
- Genetic counselors or neurologists (for discussing results and implications)
Risks and Complications
- Common Risks: Minor risks include bruising or discomfort at the blood draw site.
- Rare Risks: Rarely, there may be infection or significant bleeding.
Benefits
The benefits include an accurate diagnosis of spinocerebellar ataxia, early intervention, and better-informed decision-making regarding treatment and family planning. These benefits are typically realized soon after receiving the test results.
Recovery
There is minimal recovery time. Patients may resume normal activities immediately after the blood draw. Follow-up appointments may be scheduled to discuss test results and next steps.
Alternatives
Alternative tests include clinical evaluations and imaging studies. However, these may not provide the genetic confirmation that ATXN2 gene analysis offers. Another genetic test could be used, but the ATXN2 analysis is specific for diagnosing spinocerebellar ataxia.
Patient Experience
Patients may feel a slight pinch during the blood draw. Post-procedure, minor soreness at the puncture site is possible. Pain management is usually unnecessary as discomfort is minimal and temporary.