Learn what genetic testing is, how it’s performed, the different types, and when it’s best to get it done. Find out how to prepare for it.
Table of Contents
- What is genetic testing and what is it for?
- Types of genetic tests available in Poland
- How does genetic testing work step by step?
- Who should undergo genetic testing?
- How to prepare for genetic testing?
- Genetic testing and disease – when is it worth doing?
What is genetic testing and what is it for?
Genetic testing is a modern diagnostic tool that enables a detailed analysis of a person’s genetic material—DNA, RNA, or chromosomes. These tests can identify genetic changes, known as mutations, which may be responsible for the development of hereditary diseases, predispositions to various medical conditions, or metabolic abnormalities. Genetic testing has a wide range of medical applications and is often a crucial element in diagnosing, preventing, and treating many conditions, including cancers, metabolic disorders, cardiological and neurological diseases, as well as infertility or rare diseases. Tests can range from simple analyses of single genes to advanced genetic panels such as whole genome or exome sequencing. Practically, these tests are most often performed on samples of blood, saliva, or a cheek swab. The results not only reveal the presence of specific mutations but also supply information about inheritance patterns, disease risk, and the chances of passing conditions onto future generations. Moreover, genetic test results are used in planning pharmacological treatments (pharmacogenetics), indicating possible side effects of drugs or the likelihood of therapy effectiveness, allowing doctors to tailor treatment to individual patient needs.
The main goal of genetic testing is early identification of predispositions and mutations, making it possible to implement appropriate health prevention and medical monitoring—especially important for diseases that may be asymptomatic for a long time. The most common reasons to undergo genetic testing include early-onset cancers in the family, having a child with a birth defect, reproductive failures, suspicion of metabolic disorders, or hereditary neurological diseases. Genetic tests are also used in prenatal diagnostics, enabling the detection of fetal genetic disorders, as well as in pre-implantation diagnostics during in vitro procedures. Newborn screening tests are also vitally important, as they can detect many diseases in the pre-symptomatic stage, allowing for treatment that can prevent irreversible damage. It’s worth noting that more healthy individuals are choosing these tests to learn about their genetic predispositions and optimize their lifestyle or plan parenthood consciously. It should be remembered that the interpretation of genetic test results should always be performed by an experienced clinical geneticist, who considers all health factors, family history, and individual patient risk to prepare personalized recommendations for further diagnostics, prevention, or therapy.
Types of genetic tests available in Poland
Poland offers many types of genetic tests that differ in scope, methods, and clinical application. The most important and commonly performed tests are molecular tests, which detect specific changes (mutations, deletions, duplications, or polymorphisms) in the DNA structure. Examples include BRCA1 and BRCA2 gene tests for predispositions to breast and ovarian cancer, as well as tests for MTHFR, APC, or CFTR genes linked to cystic fibrosis and familial adenomatous polyposis. Molecular analysis may cover single genes or broad panels examining dozens or even hundreds of genes linked with specific illnesses, such as oncology, cardiology, or neurology panels. Another advanced method is next-generation sequencing (NGS), which allows for analysis of the entire exome (WES—whole exome sequencing) or even the whole genome (WGS—whole genome sequencing). These tests provide exceptionally precise identification of both known and previously unidentified genetic variants, which is particularly important for diagnosing rare genetic diseases, conditions with ambiguous symptoms, or situations where traditional diagnostics have failed. In Poland, cytogenetic tests are also available, involving the analysis of chromosome number and structure. A classic karyotype exam evaluates the set of chromosomes isolated from blood or other tissues, identifying chromosome aberrations such as trisomies (e.g., Down syndrome), deletions, translocations, or mosaicism. Techniques such as fluorescent in situ hybridization (FISH) are increasingly used for precisely detecting certain chromosomal changes like microdeletions or microduplications that may cause developmental disorders or infertility.
A very important group of examinations are genetic tests in prenatal and neonatal diagnostics. Prenatal tests, such as NIPT (non-invasive prenatal testing, e.g., Harmony, Panorama, or NIFTY), analyze free fetal DNA present in the mother’s blood, allowing assessment of the risk for most common genetic syndromes at an early stage of pregnancy without invasive procedures (such as amniocentesis or chorionic villus sampling). If an increased risk is detected, further diagnostic testing is often recommended, such as traditional amniocentesis or molecular analysis of fetal material. In neonates, a wide panel of screening tests is available for early detection of metabolic and genetic conditions (e.g., phenylketonuria, cystic fibrosis, congenital hypothyroidism), enabling prompt treatment and preventing complications. Pharmacogenetic tests, predicting how the body will respond to specific drugs and allowing for personalized therapy (especially in oncology and psychiatry), are also gaining popularity. In Poland, nutrigenetic tests examining predispositions to food intolerances or metabolic disorders are increasingly important for individual health prevention and dietary planning. Genetic testing is also performed in family planning and infertility diagnostics, including risk assessment for thrombophilia, chromosomal analysis of partners, or identifying mutations that increase the risk of miscarriage. Thanks to advanced laboratory methods and technological progress, the range of genetic tests is expanding, and more laboratories and genetic clinics offer tailored panels and consultations with a clinical geneticist for more effective diagnosis and prevention.
How does genetic testing work step by step?
The process of genetic testing is meticulously organized to ensure both the highest reliability of results and patient safety. The first and very important stage is a consultation with a doctor—usually a clinical geneticist or the specialist referring you for testing. During this visit, the doctor collects a thorough family history of hereditary diseases, reviews the patient’s medical history, and discusses the indications and expectations for the test. At this stage, a decision is made about the specific type of genetic test, and the doctor explains what the test can reveal. The physician also provides education about potential implications of the result and genetic data confidentiality. The next step is signing informed consent for testing, confirming the patient understands the purpose and possible consequences—both emotional and medical. After administrative formalities, the biological material is collected, usually in the form of venous blood, a mouth swab, saliva, or occasionally tissue fragments (e.g., in prenatal or oncology testing). The choice of sample depends on the scope of testing, the patient’s age, and the methods used. Blood collection is performed in a procedure room and is usually quick and routine, with no special preparation required unless the lab specifies otherwise. Once collected, the sample is sent to the genetics laboratory, properly secured and labeled with an anonymous code.
In the laboratory, the next multi-stage process begins. The first step is the isolation of genetic material, separating DNA (or RNA) from the supplied sample, and the quality of isolation is crucial for accurate results. Depending on the chosen test—single genes, panels, next-generation sequencing (NGS), or cytogenetics—specialized laboratory methods are used. In molecular testing, DNA undergoes enzyme reactions, replication of fragments, and detailed analysis to detect possible mutations and genetic variants. For cytogenetic studies, the sample is prepared for microscopic observation, allowing evaluation of chromosome structure and number. All laboratory stages are conducted by qualified staff under strict quality and safety procedures. Genetic test results are typically not available immediately—the waiting period may be from several days to a few weeks, depending on the complexity and methods used. Once results are ready, they are forwarded to the referring doctor, who invites the patient for a follow-up to interpret them. During this visit, the geneticist explains the significance of detected mutations or their absence, assesses disease risk, and advises on further diagnostic or preventive steps. Sometimes results require further consultation with other specialists—oncologists, dieticians, cardiologists—to create an individualized care plan. It’s important to note that the entire testing process is subject to strict confidentiality and genetic data protection. Samples and results are anonymized, accessed only by authorized personnel, and documentation is stored according to current legislation and ethical standards. Every stage—from patient interview, sample collection, advanced laboratory analysis, to result interpretation—forms a comprehensive genetic diagnostic pathway, helping patients understand their health and disease risk for more conscious decision-making.
Who should undergo genetic testing?
Genetic testing is suitable for a wide range of people, including those already struggling with genetically-based diseases and healthy individuals wanting to learn about their health predispositions, maintain preventive healthcare, or plan parenthood. The key group includes patients with symptoms of illnesses of unclear origin, particularly if symptoms appear at a young age, are severe or unusual, or are unresponsive to standard treatments. Genetic testing is also recommended for those with a family history of hereditary diseases, such as cancers (breast, ovarian, colon), cardiovascular diseases, type 1 diabetes, muscular dystrophies, cystic fibrosis, hemochromatosis, or various metabolic disorders. Families experiencing frequent unexplained miscarriages, stillbirths, or infertility could benefit from chromosome and mutation testing that may affect the pregnancy or offspring’s health. Such testing is critical for couples planning children, especially where a hereditary risk is documented or elevated for certain conditions.
Genetic testing also plays a vital role in health prevention, applicable to anyone curious about their genetic inheritance, medication responses, nutritional needs, or environmental exposures. Panels for cancer, heart disease, stroke, hereditary thrombophilia predispositions, as well as pharmacogenetic and nutrigenetic panels, are particularly useful for optimal treatment and personalized diet planning. Another significant group includes pregnant women and those planning to become mothers. Prenatal tests such as NIPT are indicated for pregnant women of any age, but especially those over 35 or with abnormal ultrasound or biochemical test results. Neonatology and pediatrics also rely on newborn screening for early metabolic and other serious diseases that may affect child development. Genetic diagnostics are crucial in cases of developmental delays, intellectual impairment, birth defects, or abnormal organ morphology in children. For adults, genetic testing is becoming increasingly important in personalized medicine, e.g., oncology (choosing targeted therapies), cardiology (assessing risk of sudden cardiac death from ion channel mutations), and psychiatry (mood disorders or adverse reactions to psychiatric drugs). Some tests are also performed for administrative or legal reasons—paternity verification, forensics, or ethnic origin analysis.
How to prepare for genetic testing?
Preparing for genetic testing involves several important steps to ensure result reliability and patient comfort throughout the process. Before the test, consultation with a geneticist or specialist is essential to evaluate indications, review family history, and explain the purpose and possible consequences of genetic diagnostics. Bring your medical documentation and records of hereditary diseases in your family (e.g., cancers, birth defects, neurological disorders), and note any questions or concerns. During the consultation, the doctor will discuss the procedure, potential benefits, and risks—both physical (related to sample collection) and psychological, as the result may impact future decisions for both patient and family. Before providing written consent for the test, patients receive information about confidentiality and the storage of their genetic data. For family planning or prenatal diagnostics, a discussion with your partner and, if needed, a joint consultation with your gynecologist is advised.
Preparation depends primarily on the type of biological material and the specifics of the test. Most tests use venous blood drawn from the arm, typically on an empty stomach in the morning—be well-rested and well-hydrated; sometimes you should fast for 8–12 hours, but drinking water is allowed unless the doctor advises otherwise. For saliva or cheek swab samples, avoid eating, drinking, chewing gum, or brushing teeth for at least one hour before sample collection. Avoid intense physical activity and major stress just before sampling to keep your body stable and reduce discomfort. Do not stop any medication without consulting your doctor, though for pharmacogenetic or metabolic gene tests your doctor may recommend briefly withholding supplements that affect DNA metabolism. Report any infections, fevers, chronic illnesses, or specific medications to staff to assess if testing should be postponed. For prenatal diagnostics—NIPT or pregnancy screenings—additional, doctor-specific instructions must be followed. Record the date of your last period, previous tests, and have contact information for your gynecologist to support complete analyses. For children and newborns, follow your pediatrician’s directions. All these actions aim to ensure both test reliability and safety throughout the diagnostic process. For advanced procedures such as biopsies, you may be asked to temporarily refrain from food or certain activities. For paternity tests or kinship analyses, avoid contaminating samples—don’t smoke, drink alcohol, or touch swabs with your hands. Every laboratory provides detailed preparation instructions that must be followed to ensure objective, reliable genetic results.
Genetic testing and disease – when is it worth doing?
Genetic testing is foundational to modern diagnostics for both hereditary and complex diseases. A key time to consider testing is when a patient faces recurring, hard-to-explain symptoms, or has a family history of genetically-based diseases like cancers, heart disease, type 1 diabetes, muscular dystrophies, cystic fibrosis, or certain neurological disorders. Testing is especially advised when a family member is diagnosed with a particular disease at a young age, such as breast, ovarian, or colon cancer before age 50. Genetic testing is vital for diagnosing rare metabolic diseases that cause developmental problems in children or nonspecific symptoms unexplained by routine tests. In families with generation-spanning patterns of the same health issues, genetic testing can confirm inherited predisposition and point to the best prevention or management strategies. Essential groups include couples struggling with infertility, women experiencing recurrent miscarriages, or failed IVF—assessing chromosomal or gene mutations in both partners enables timely therapy and family planning. For specific clinical indications, genetic testing is important before using immunosuppressants, cytostatics, or even certain antibiotics, helping predict responses and complication risk. Similarly, pharmacogenetic diagnostics enable personalized treatments in, for example, oncology, where tests like BRCA1, BRCA2, TP53, or EGFR gene analysis can guide targeted therapy.
Genetic testing is also critical for prevention—especially in cancers, cardiology, and neurology, where diseases may be asymptomatic for a long time. Healthy people with family histories of such diseases are advised to undergo testing to more precisely assess their risk and implement early preventive measures. Women from families with gynecological cancers (ovarian, breast, cervical) can take advantage of gene panels to determine their predisposition and set up tailored monitoring and prevention. In families with developmental disorders, intellectual disabilities, epilepsy, or autism, genetic testing is invaluable for both accurate diagnosis and directing families to specialized support. Today, healthy people increasingly choose genetic testing to discover mutations linked to food intolerances, autoimmune disorders, or lifestyle diseases such as cancer or cardiovascular conditions. Additional indications include tests run before planned parenthood, during pregnancy, and in newborn screening—enabling immediate detection of diseases requiring urgent intervention, e.g., phenylketonuria or spinal muscular atrophy (SMA). However, the decision to undergo genetic testing should always be consulted with a specialist to assess whether the tests are needed and whether they will deliver real health benefits for the patient and family. Genetic testing is also used in forensic medicine, confirming kinship, identifying missing persons, or resolving paternity disputes. Advances in technology are making DNA tests more accessible, faster, and cheaper, but their implementation should always be based on a reliable assessment of clinical indications, benefits, and potential consequences for the person’s health and life.
Summary
Genetic testing is an effective method of identifying disease predisposition and speeding up diagnosis. It can detect DNA changes, predict the risk of cancers and other conditions, and facilitate prevention. Types of genetic tests include screening, diagnostic, personal predisposition, and special mutation detection tests. The examination commonly involves a blood sample or cheek swab and is quick and painless. It’s worth preparing for the test and considering it, particularly if there are genetic diseases in your family. Knowing your genome means more control over your future health.
