What is Genetic Testing?

Genetic testing is a medical procedure that analyzes DNA extracted from human cells, such as blood, saliva, or tissues, using advanced molecular biology techniques. It deciphers gene sequences, assesses copy numbers, and evaluates methylation patterns. This process provides profound insights into an individual's unique genetic makeup, potential disease risks, and medication responses.

Testing targets: Gene variations, mutations, polymorphisms, and methylation on DNA/RNA.

Why is genetic testing necessary?

1. Disease risk assessment: Evaluates the likelihood of individuals with a family history developing specific genetic disorders or tumors, and guides crucial early screening and preventive measures.

2. Disease diagnosis and classification: Pinpoint the etiology and pathological type of suspected genetic disorders, rare diseases, and tumors through genetic testing to enable a definitive diagnosis.

3. Guiding treatment and medication: Particularly in oncology and infectious diseases, it involves selecting targeted therapies, immunotherapies, or antibiotics based on genetic mutations, paving the way for true 'precision medicine'.

4. Prognostic assessment and recurrence monitoring: Rely on genetic testing for tumor patients to evaluate recurrence and metastasis risks, so as to tailor follow - up intensity and treatment duration.

5. Fertility and genetic counseling: Encompassing preconception, prenatal, and newborn screening, these processes clarify the risk of transmitting genetic diseases and guide reproductive decisions.

What benefits does genetic testing have?

1. Early detection of risks: For tumors, genetic diseases, and other conditions, high - risk status can be identified before the onset of symptoms, enabling early intervention.

2. More accurate diagnosis: For complex diseases, rare diseases, and tumor classification, genetic testing often serves as the critical basis.

3. Avoid ineffective treatment and minimize side effects: For instance, tumor - targeted drugs are only effective for patients with corresponding gene mutations; drug - related genetic testing can reduce allergic reactions and ineffective medication.

4. Optimize the treatment regimen to enhance therapeutic efficacy: Accurately select drugs, dosages, and treatment strategies to enhance therapeutic efficacy and reduce trial - and - error costs.

5. Genetic risk management in the family: After the identification of familial pathogenic genes, screening can be conducted among relatives to achieve the goal of 'one person tested, the whole family benefited'.

Adaptable population(Common scenarios)

1. Tumor-related genetic testing: 

For confirmed tumor patients: guidance on targeted therapy, immunotherapy, and chemotherapy regimens.

High - risk populations for tumors: those with a family history of tumors, long - term smoking or alcohol consumption, or high - risk occupational exposures.

Patients with tumor recurrence/metastasis: Monitoring for drug - resistance mutations and evaluating prognosis.

2. Genetic and rare diseases:

Individuals with a family history of genetic disorders.

Individuals with unexplained developmental delays, intellectual disabilities, malformations, or multisystem abnormalities.

Couples experiencing recurrent miscarriages or infertility (screening for chromosomal/gene abnormalities).

3. Drug-related genetic testing:

Population planned to receive specific medications (e.g., antiepileptic drugs, anticoagulants, chemotherapeutic agents, antidepressants, etc.).

Patients with a history of severe adverse drug reactions or poor therapeutic efficacy.

4. Fertility and Prenatal Care:

Pregnancy - Preparatory Couples: Genetic Disease Carrier Screening;

Pregnancy: Screening for chromosomal abnormalities such as Down syndrome and prenatal diagnosis of genetic disorders;

Neonates: Screening for certain genetic disorders (e.g., phenylketonuria).

5. Other applications:

Gene testing related to organ transplantation donor - recipient matching;

Infectious diseases: Pathogen gene testing, drug resistance gene testing.