DMD (dystrophin) (eg, Duchenne/Becker muscular dystrophy) deletion analysis, and duplication analysis, if performed
CPT4 code
Name of the Procedure:
DMD Gene Deletion/Duplication Analysis
Summary
This procedure involves analyzing the DMD (dystrophin) gene to detect deletions or duplications, which can help diagnose conditions like Duchenne or Becker muscular dystrophy. These genetic conditions affect muscle strength and function.
Purpose
The main goal is to identify mutations in the dystrophin gene. Detecting these mutations helps diagnose muscular dystrophy, guide treatment decisions, and provide genetic counseling for affected families.
Indications
- Symptoms of muscle weakness, particularly in young boys.
- Family history of Duchenne or Becker muscular dystrophy.
- Elevated levels of creatine kinase (CK) in blood tests.
- Unexplained muscle wasting or difficulty in physical activities.
Preparation
- No specific preparation such as fasting or medication adjustments is needed.
- A simple blood sample is typically required.
- Pre-procedure consultation with a genetic counselor may be recommended.
Procedure Description
- A blood sample is collected from the patient.
- DNA is extracted from the blood sample.
- The extracted DNA is subjected to molecular techniques like Multiplex Ligation-dependent Probe Amplification (MLPA) or Comparative Genomic Hybridization (CGH) to detect deletions or duplications in the DMD gene.
- Results are analyzed and interpreted by a geneticist.
Duration
The entire process, from blood draw to results, typically takes 2-4 weeks.
Setting
- Performed in a genetic or molecular biology laboratory.
- Blood sample can be collected in a hospital, clinic, or specialized testing center.
Personnel
- Phlebotomists or nurses to collect the blood sample.
- Laboratory technicians and geneticists for sample processing and analysis.
Risks and Complications
- Minimal risk associated with blood draw, such as bruising or lightheadedness.
- Rare instances of inconclusive results, necessitating further testing.
Benefits
- Provides a definitive diagnosis of Duchenne or Becker muscular dystrophy.
- Helps in planning appropriate medical care and management.
- Facilitates genetic counseling and family planning for affected families.
Recovery
- No recovery is needed after the blood draw.
- Patients can resume normal activities immediately after the sample collection.
Alternatives
- Muscle biopsy with dystrophin protein analysis: More invasive but used if genetic testing is inconclusive.
- Next-generation sequencing for comprehensive genetic analysis: More expensive and time-consuming but provides detailed information.
Patient Experience
- Brief discomfort during the blood draw.
- Waiting period for results which may cause some anxiety.
- Psychological support and counseling available if the test confirms a diagnosis of muscular dystrophy.
Pain management is generally not required, and the focus is on providing emotional support and clear communication of the results and next steps.