Genetic Counselling vs Genetic Laboratory Analysis in PGT: Who Does What

Patients researching PGT often meet two very different conversations and assume they are the same service. They are not. Genetic counselling is a discussion about what a genetic test could mean for you, your family and your decisions. Genetic laboratory analysis is the technical work that produces a written result from an embryo sample. One is interpretation and support; the other is measurement and reporting.

Keeping the two separate helps you ask the right person the right question, and it helps you notice when something important has not yet been explained.

Two different jobs, in plain terms

Genetic counselling is a conversation, usually with a trained genetics professional, that happens before and after testing. It covers how a condition or chromosome change might be inherited, what a particular test can and cannot detect, what consent involves, how uncertain or unexpected findings might be handled, and what your options are once a result exists. It is where a laboratory result becomes something you can actually reason about.

Genetic laboratory analysis is the work behind the result. It includes how the embryo sample is handled, which testing method is used, internal quality checks, how findings are classified, and the written report that is issued. The laboratory does not know your family history in the way a counsellor does, and it does not make decisions for you.

A simple way to hold the distinction: the laboratory tells you what was observed in the sample. Counselling helps you understand what that observation does and does not tell you about the embryo, your options and your next steps.

What each side can and cannot answer

Question	Genetic counselling	Genetic laboratory analysis
How might this condition be inherited in our family?	Yes, this is core counselling work	No, not its role
What does this test detect, and what does it miss?	Yes, including limits and uncertainty	Yes, for the specific method used
What was actually observed in this sample?	Explains the report with you	Yes, this is the laboratory’s finding
Does this result guarantee a healthy child or a pregnancy?	Explains why it does not	No, and no test can
Which option should we choose?	Supports your decision; does not decide for you	No, not its role
Who signed and issued this report?	May help you locate it	Yes, the reporting laboratory

Neither column replaces your treating fertility clinician, who puts the result together with your medical history and discusses treatment options with you.

Why a result label is not a full explanation

PGT results are often described with short labels, and it is tempting to treat a label as a complete answer. It is not. For PGT-A, which assesses chromosome number in cells sampled from an embryo, the HFEA notes that testing has limitations and can produce incorrect findings, and that a result does not guarantee a successful pregnancy or a healthy child. That is exactly the gap counselling is designed to address: what a result means, what it does not mean, and how much weight to give it in your situation.

Mosaic findings show the same point from another angle. The ASRM committee opinion explains that a mosaic PGT-A result is inferred from intermediate chromosome copy-number findings in a biopsy sample, that technical factors can contribute to such findings, and that a sampled result does not establish the cell composition of the whole embryo. In other words, the laboratory reports what the sample showed; the conversation about what that implies for a transfer decision belongs with your clinician and genetic counsellor.

This is why a report and a counselling session are not interchangeable. A report can be accurate about the sample and still leave you with real questions that only a discussion can address.

Different tests, different counselling conversations

The counselling conversation changes with the test. PGT-M concerns a known monogenic condition, while PGT-SR concerns chromosomal structural rearrangements; the HFEA describes these as addressing different questions, with the treating team and a genetic counsellor discussing the relevant history, test design and suitability. For PGT-M in particular, the laboratory often needs family information to design the test, which is a good example of counselling and laboratory work feeding each other rather than competing.

If you are weighing a combined approach, the questions worth raising with a genetic counsellor about combining PGT-M and PGT-A are a useful starting point for that conversation.

How this fits an international PGT journey in Thailand

When you are arranging testing abroad, the two roles can sit in different places, at different times, and sometimes in different countries. Three practical points are worth confirming early.

• Who provides counselling, and when. Ask whether pre-test counselling is available remotely before you travel, who provides post-test counselling, and whether it happens by video, phone or in person. Confirm whether an interpreter is needed and who arranges it.
• Who signs the laboratory report. Ask which laboratory performs the analysis, what the report will contain, and how and when it will be shared with you. A report you cannot read or discuss is of limited use.
• What happens after you return home. Ask how follow-up questions about a result will be handled once you have left Thailand, and who your point of contact will be.

If you want to understand how a laboratory pathway is described and verified before committing, the guide to verifying a Thai fertility hospital’s laboratory pathway for PGT sets out what to look for. For the referral and counselling side of a specific test, the PGT-M referral, counselling and lab pathway questions article covers that ground in more detail.

Where coordination helps, and where it stops

Coordinating support can help you prepare for both sides of this. That might mean organising your goals, family history details and questions before a counselling appointment, requesting records and reports in a readable form, arranging a remote consultation, or planning how follow-up questions will be handled after you return home. What coordination does not do is interpret your results, diagnose, prescribe or advise on eligibility; those belong to licensed clinicians and genetics professionals.

If you are comparing quotations for testing, it is worth checking whether counselling sessions, report delivery and follow-up communication are listed as inclusions or left unconfirmed, since a laboratory fee and a counselling fee are not the same item. The guide to understanding and comparing genetic testing fees for IVF is a reasonable place to see how those components are usually separated.

A short way to remember the difference

Laboratory analysis answers: what did the sample show, by what method, and who reported it? Genetic counselling answers: what does that mean for us, what remains uncertain, and what are our options? A good PGT pathway gives you both, in the right order, with a named person responsible for each.

Frequently asked questions

Can genetic counselling tell me my chance of a successful pregnancy?

Counselling can explain what a test result does and does not establish, including its limitations, but individual chances are a clinical question for your treating fertility clinician, who considers your full history. No PGT result guarantees a pregnancy or a healthy child.

If I only have a laboratory report, what is missing?

A report describes what was observed in the sample and the method used. What is usually missing is the discussion: how much weight the finding carries for your situation, what uncertainty remains, and which options to consider. That conversation belongs with your clinician and a genetic counsellor.