Rare diseases affect approximately 1 in 20 people globally, yet the average patient waits 4–7 years before receiving a correct diagnosis. Genetic testing is transforming this reality — providing answers that were previously out of reach and enabling earlier, more targeted interventions.
Why Rare Diseases Are Hard to Diagnose
Rare diseases are often characterised by non-specific symptoms that overlap with more common conditions. Many affect multiple organ systems, making it difficult for any single specialist to identify the underlying cause. Without a genetic diagnosis, patients may undergo years of unnecessary tests, misdiagnoses, and ineffective treatments.
How Genetic Testing Helps
- Whole Exome Sequencing (WES): Analyses the protein-coding regions of all genes — where 85% of disease-causing mutations occur. WES is particularly powerful for diagnosing rare conditions with unclear or overlapping symptoms.
- Whole Genome Sequencing (WGS): Analyses the entire genome, including non-coding regions. Useful when WES does not provide a diagnosis.
- Chromosomal Microarray Analysis (CMA): Detects chromosomal deletions and duplications associated with developmental disorders and rare syndromes.
- Gene Panel Testing: Screens a targeted set of genes associated with a specific disease category (e.g., cardiomyopathy panel, epilepsy panel).
The Impact of Early Diagnosis
- Access to targeted therapies: Some rare diseases now have approved treatments that are most effective when started early.
- Avoidance of harmful treatments: A correct diagnosis prevents exposure to treatments that may be ineffective or harmful for the specific condition.
- Family planning guidance: Knowing the genetic cause allows parents to understand recurrence risk and explore reproductive options.
- Clinical trial eligibility: A confirmed genetic diagnosis may open access to clinical trials for emerging therapies.
The Role of Genetic Counselling
Genetic counselling is an essential companion to genetic testing for rare diseases. A genetic counsellor helps families understand complex results, navigate the emotional impact of a diagnosis, and plan next steps for management and family planning.
Conclusion
For families living with an undiagnosed rare disease, genetic testing can be the key that finally unlocks answers. Early diagnosis through advanced genetic testing opens the door to appropriate care, support, and hope.
End the Diagnostic Odyssey
MapmyGenome’s Whole Exome Sequencing and Whole Genome Sequencing services help diagnose rare and undiagnosed genetic conditions — with NABL & CAP accredited lab analysis and genetic counselling included.
Explore Whole Exome Sequencing → Explore Whole Genome Sequencing →
