81181 ATXN7 (ataxin 7) (eg, spinocerebellar ataxia) gene analysis, evaluation to detect abnormal (eg, expanded) alleles

Name of the Procedure:

ATXN7 (ataxin 7) Gene Analysis, Evaluation to Detect Abnormal (e.g., Expanded) Alleles; Spinocerebellar Ataxia Type 7 (SCA7) Genetic Testing

Summary

The ATXN7 gene analysis is a genetic test to identify mutations in the ataxin 7 gene, which can cause Spinocerebellar Ataxia Type 7 (SCA7). This procedure detects abnormal expansions of alleles in the gene, which are linked to the development of SCA7.

Purpose

This test is used to diagnose Spinocerebellar Ataxia Type 7, a condition characterized by progressively worsening coordination and balance issues. The goal is to confirm a diagnosis, provide information on the inheritance pattern, and guide treatment and genetic counseling.

Indications

• Patients displaying symptoms such as lack of coordination, balance problems, and visual impairment.
• Individuals with a family history of spinocerebellar ataxia.
• Patients who have undergone preliminary neurological examinations suggesting ataxia.

Preparation

• No special preparation, such as fasting or medication adjustments, is typically required.
• A blood sample is usually collected; hence, previous blood tests may be reviewed.

Procedure Description

1. A healthcare provider collects a blood sample from the patient.
2. The sample is sent to a specialized laboratory.
3. Geneticists analyze the DNA to detect any expanded alleles of the ATXN7 gene.
4. Results are interpreted by genetic counselors in conjunction with the patient's medical history and symptoms.

Duration

The blood sample collection takes about 10-15 minutes. Laboratory analysis can take several weeks, depending on the testing facility.

Setting

The blood sample is typically collected in an outpatient clinic, hospital, or laboratory setting.

Personnel

• Phlebotomist or nurse for blood sample collection.
• Geneticist and laboratory technicians for DNA analysis.
• Genetic counselor and potentially a neurologist for interpretation and follow-up.

Risks and Complications

• Common risks: Minor discomfort or bruising at the blood draw site.
• Rare risks: Potential for infection at the puncture site.

Benefits

• Accurate diagnosis of SCA7.
• Informed decision-making regarding management and treatment.
• Genetic counseling for family planning and understanding inheritance risks.
• Valuable information for research and potential future therapies.

Recovery

• Minimal recovery time as the procedure involves just a blood sample collection.
• Patients can resume normal activities immediately.
• Follow-up appointments may be scheduled to discuss results and implications.

Alternatives

• Clinical diagnosis based on symptoms and history, though less accurate without genetic confirmation.
• Other genetic tests in cases where symptoms may overlap with different types of spinocerebellar ataxia.

Patient Experience

• The procedure involves minimal discomfort comparable to a routine blood draw.
• Anxiety about the results can be managed with support from genetic counselors and healthcare providers.
• Continuous coordination with healthcare professionals for interpretation of results and management of SCA7 if diagnosed.