What Is a Clinical Genetics Laboratory?
A clinical genetics laboratory is a medical laboratory that investigates genetic and genomic changes that may be relevant to health. It may test DNA, chromosomes or other genetic material to support diagnosis, risk assessment, cancer care, rare disease investigation or inherited condition pathways.
Modern services often use the term genomics laboratory because testing may look beyond single genes and consider larger parts of the genome.
Genetics vs genomics
| Term | Meaning |
|---|---|
| Genetics | Study of genes and inheritance |
| Genomics | Study of the whole genome and how genetic information is organised and used |
| Clinical genetics | Medical specialty focused on inherited conditions and genetic risk |
| Clinical genomics laboratory | Laboratory service using genomic tests to support healthcare |
What does a clinical genetics laboratory test?
A clinical genetics or genomics laboratory may investigate single gene changes, panels of genes, chromosome changes, copy number changes, cancer-related genetic changes, inherited disease variants, pharmacogenomic markers in some services and infectious disease genomics in some contexts.
Common methods
| Method | What it can help detect |
|---|---|
| DNA sequencing | Changes in DNA sequence |
| Next-generation sequencing | Many DNA/RNA fragments or genes at once |
| FISH | Specific chromosome or gene-region changes |
| Karyotyping | Large chromosome changes |
| Microarray | Copy number changes across the genome |
| PCR-based methods | Specific genetic targets |
| MLPA or similar methods | Deletions/duplications in selected genes |
What is a variant?
A variant is a difference in genetic sequence. Not all variants cause disease. Variants may be classified as benign, likely benign, variant of uncertain significance, likely pathogenic or pathogenic. Interpretation can be complex and depends on evidence, clinical context, inheritance pattern and testing guidelines.
What samples are used?
Genetic testing may use blood, saliva, buccal swabs, tissue, bone marrow, tumour samples or prenatal/reproductive samples in specialist pathways. The sample type depends on whether the test is for inherited disease, cancer, blood disorders, prenatal testing or another pathway.
What does a genetics laboratory professional do?
A biomedical scientist, genetic technologist or genomic scientist may be involved in receiving and checking samples, extracting DNA or RNA, preparing sequencing libraries, running molecular platforms, performing FISH or other genetic methods, checking quality metrics, reviewing technical validity, supporting data analysis workflows, maintaining traceability, documenting quality issues and working with clinical scientists and genetic specialists.
What is FISH?
FISH stands for fluorescent in situ hybridisation. It uses fluorescent probes to visualise specific chromosome regions or genetic changes. FISH may be used in cancer genetics, prenatal testing or other specialist contexts.
What is next-generation sequencing?
Next-generation sequencing, or NGS, allows many DNA or RNA fragments to be sequenced at once. It is widely used in modern genomics because it can test multiple genes or regions efficiently.
Clinical genetics lab vs genetic counselling
A clinical genetics laboratory performs tests and generates laboratory data. Genetic counselling focuses on helping patients and families understand genetic risk, inheritance and implications. These services may work together, but they are not the same.
Why genetic testing needs caution
Genetic information can affect not only the patient but also relatives. Results may have implications for inherited risk, family planning, insurance discussions, cancer pathways or future monitoring. This is why genetic testing is governed carefully and usually requires appropriate clinical referral, consent and interpretation.
Summary
A clinical genetics laboratory investigates DNA, chromosomes and genomic changes that may be relevant to health. It may support rare disease diagnosis, cancer care, inherited condition investigation and other specialist pathways. Genetics and genomics results require careful interpretation because not every variant causes disease, and results may have family implications.
FAQ
What does a clinical genetics laboratory do?
It tests DNA, chromosomes or genomic material to support diagnosis, cancer care, inherited disease investigation and other specialist pathways.
What is the difference between genetics and genomics?
Genetics often focuses on genes and inheritance, while genomics looks more broadly across the genome.
What is a genetic variant?
A variant is a difference in genetic sequence. Some variants are harmless, while others may be linked with disease.
Is genetic testing the same as genetic counselling?
No. The laboratory performs tests, while genetic counselling supports interpretation, communication and family implications.
What is NGS?
Next-generation sequencing is a high-throughput method that can sequence many DNA or RNA fragments at once.
This article is for general education only. Genetic testing and interpretation should be guided by qualified healthcare professionals and appropriate consent processes.