Can Georgia PGT Screen for Chromosomal Abnormalities? Analysis of Technical Principles and Applicable Conditions

A Patient's Real Consultation: Can My Embryo Be Checked for Chromosomal Problems?

During my Tuesday morning clinic, a 38-year-old patient with recurrent miscarriage held a brochure from a Georgian reproductive center and asked me: "Doctor, they say Georgia can do PGT. Can this test detect all chromosomal abnormalities? I've had two miscarriages and am very worried about embryo problems."

This question is very typical in clinical practice. Many patients regard PGT as a "universal embryo filter," believing that as long as they undergo PGT, the embryo will be completely normal. However, the actual situation requires distinguishing between test types and limitations. Below, from a reproductive doctor's perspective, I will clarify the truth about Georgia PGT screening for chromosomal abnormalities.

Direct Answer: Which Chromosomal Abnormalities Can Georgia PGT Screen For?

The PGT (Preimplantation Genetic Testing) technology commonly practiced in Georgian reproductive centers mainly addresses chromosomal abnormalities in two situations:

• Chromosomal Numerical Abnormalities (Aneuploidy): Can be screened. For example, Trisomy 21 (Down syndrome), Trisomy 18 (Edwards syndrome), Trisomy 13 (Patau syndrome), and sex chromosome numerical abnormalities (such as Turner syndrome, Klinefelter syndrome). This is the core function of PGT-A (traditional PGD/PGS).
• Chromosomal Structural Abnormalities: Such as balanced translocations, Robertsonian translocations, inversions, etc., and microdeletions/microduplications (microdeletion/microduplication syndromes), require specific PGT-SR technology (Structural Rearrangement testing). Some Georgian laboratories can provide PGT-SR or SNP-based microarray testing, but not all centers have this capability.
• Single-Gene Disorders: Such as cystic fibrosis, thalassemia, etc., require PGT-M (Monogenic testing), which is a different procedure from chromosomal screening. A few centers in Georgia can offer this, usually requiring the pathogenic gene to be identified first.

Key Conclusion: Georgia PGT-A can screen for embryonic chromosomal numerical abnormalities, but it cannot screen for all types of chromosomal problems. Patients need to choose the corresponding testing plan based on their own situation.

Why Do Patients Ask "Can It Screen?" — Common Cognitive Misconceptions

In consultations, at least half of the patients have misunderstandings about PGT, stemming from a lack of clarity regarding the classification of chromosomal abnormalities.

Misconception 1: PGT Equals "Full Genetic Screening"

PGT only tests the embryonic trophectoderm cells (which will develop into the placenta) and cannot detect genetic diseases in the fetus itself. Moreover, the scope of testing depends on the technology platform used — NGS (Next-Generation Sequencing) can only cover deletions/duplications larger than 0.1-1Mb, and very small pathogenic sites may be missed.

Misconception 2: PGT Can Screen for All Chromosomal Abnormalities

Chromosomal abnormalities include: numerical abnormalities (euploidy/aneuploidy), structural abnormalities (translocations, inversions, ring chromosomes), mosaicism (some cells normal, some abnormal), uniparental disomy, etc. Routine PGT-A can only screen for aneuploidy and is almost ineffective for balanced translocation carriers because the total chromosome number in balanced translocation embryos is normal, but the structure is problematic, requiring special analysis.

Misconception 3: Georgia's PGT Technology Is Inferior to That in Europe and America

In reality, PGT laboratories in mainstream Georgian reproductive centers (such as some hospitals in Tbilisi and Batumi) use imported NGS platforms, with technical capabilities comparable to those in Eastern European countries. However, the quality of embryo biopsy, cell amplification, and data analysis varies between centers. Patients need to confirm whether the laboratory has ISO certification or international quality control certificates.

Reproductive Doctor's Perspective: When Is It Suitable to Undergo Georgia PGT Screening for Chromosomal Abnormalities?

According to international reproductive medicine guidelines (ASHG, ESHRE), the following groups are suitable for considering PGT-A screening:

• Female age ≥ 35 years: The rate of oocyte aneuploidy increases exponentially with age, approximately 30% at age 35, 60% at age 40, and nearly 90% at age 45.
• History of recurrent miscarriage: ≥ 2 spontaneous miscarriages, about 50% of which are related to embryonic chromosomal abnormalities.
• Recurrent implantation failure: ≥ 3 transfers of good-quality embryos without pregnancy.
• Known carriers of chromosomal abnormalities: Such as balanced translocations, Robertsonian translocations; it is recommended to also undergo PGT-SR.
• Severe male factor: Such as non-obstructive azoospermia, severe oligoasthenoteratozoospermia, where the rate of chromosomal abnormalities in sperm is elevated.

When Is It Not Suitable:

• Patients with very low ovarian reserve (AMH < 0.5 ng/ml, antral follicle count < 4), who may not obtain enough embryos for biopsy.
• Only 1-2 embryos obtained from a single egg retrieval; after biopsy, there may be no normal embryos for transfer.
• The patient has no clear indication of chromosomal abnormality and is < 35 years old (the American Society for Reproductive Medicine does not recommend routine PGT-A).
• PGT results for embryos with high-level mosaicism (30%-70% abnormal cells) may be inaccurate and require confirmation through other prenatal diagnostic methods.

Common Pitfalls: The Process and Details of Georgia PGT

When patients choose Georgia for PGT, they often overlook the following key points:

1. Biopsy Timing and Embryo Developmental Stage

Most centers in Georgia use blastocyst biopsy on day 5 or 6 (taking 5-10 trophectoderm cells), which is safer and more accurate than cleavage-stage biopsy on day 3. However, if the embryo develops slowly and cannot form a biopsiable blastocyst, PGT cannot proceed.

2. Mosaicism Management Plan

Some embryos are found to have mosaicism (e.g., 30% of cells are trisomy 13). Whether to transfer such embryos is controversial. Some centers in Georgia may recommend a second biopsy or directly discard mosaic embryos, but internationally, there are reports of transferring embryos with low-level mosaicism. This needs detailed discussion with the doctor.

3. Testing Time and Frozen Embryo Transfer Plan

The PGT testing cycle usually takes 10-14 days, and all embryos need to be frozen. When choosing low-temperature transport (dry ice shipping) to the laboratory in Georgia, logistics stability must be ensured. Some centers offer local testing, but the waiting time is similar. It is recommended to reserve at least 3-4 days in Georgia for egg retrieval.

4. Price Traps: All-Inclusive Packages May Not Cover All Tests

Some institutions advertise "Georgia PGT packages" that only include PGT-A for aneuploidy screening of 24 chromosomes. If screening for structural abnormalities (such as translocations) or mitochondrial diseases is needed, additional fees apply. The scope of testing must be clearly defined before signing the contract.

Frequently Asked Questions (Practitioner Observations)

Q1: How accurate is Georgia PGT?

The accuracy of NGS-based PGT-A for detecting aneuploidy is >98%, provided that the biopsy cells are successfully amplified and free from contamination. However, there is a very low probability of misdiagnosis (about 0.1%-0.3%), mainly due to mosaicism or amplification bias. Therefore, all PGT babies still need to undergo routine newborn screening after birth.

Q2: How long does it take to get results after egg retrieval?

Typically, reports are available 10-15 days after embryo biopsy. Including transport and report translation, the total time is about 3-4 weeks. Some centers offer expedited services (7-8 days) at a higher cost.

Q3: What if all embryos are abnormal?

This is the most regrettable situation. For older women, the probability of all embryos being aneuploid after one egg retrieval is not low. A joint decision with the doctor is needed: whether to proceed with another egg retrieval, consider egg donation, or try a natural cycle. The egg donation process in Georgia is relatively straightforward but must comply with local laws.

Q4: Can embryos from Georgia PGT be transported to other countries for transfer?

Yes. Some laboratories in Georgia support the international shipping of frozen embryos via liquid nitrogen (subject to customs regulations). However, there are risks during transport, and the reproductive center in the destination country must have the capability to receive frozen embryos. It is advisable to confirm in advance.

Observations from a Consultant with 10 Years of Experience

In assisting patients to connect with Georgian reproductive centers, I have identified three easily overlooked issues:

• Laboratory qualifications matter more than advertising: Choose a laboratory that has been operating locally for over a decade, and request quality control reports from the last two years (such as EQAS, CAP certification). Georgia currently lacks a unified regulatory body, relying on international certifications.
• Overweight or obese patients: Women with a BMI > 30 may have a higher rate of embryonic chromosomal abnormalities, along with increased risks during egg retrieval surgery. Such patients should prioritize weight loss before starting a cycle, rather than blindly proceeding with PGT.
• Psychological expectation management: Many patients believe that undergoing PGT guarantees a 100% live birth. In reality, even after transferring a normal embryo, the implantation failure or miscarriage rate remains 10%-25% (related to endometrial receptivity, hormone levels). PGT should not be seen as a magic cure-all.

Timeline Suggestions: How Long Does It Take to Do PGT in Georgia?

Using a standard process as an example:

• Initial consultation and document preparation (passport, visa, marriage notarization): 1-2 weeks
• First visit to Georgia for medical examinations (hormones, hysteroscopy, semen analysis): 3-5 days
• Ovarian stimulation cycle (about 10-12 days, must stay until egg retrieval)
• Rest 1-2 days after egg retrieval, then return home while waiting for embryo biopsy results (about 3-4 weeks)
• After results are available, second trip to Georgia for frozen embryo transfer (about 7 days)

The total time span is approximately 2-3 months, with an actual stay in Georgia of 14-20 days (split into two trips). Adequate leave should be planned.

Risk Reminder

Although Georgia PGT technology is mature, the following potential risks exist:

• The biopsy procedure may damage the embryo (about 0.01%-0.1% of embryos stop developing due to biopsy)
• The embryo survival rate during the freeze-thaw process is about 90%-95%
• Embryos with "normal" test results may still contain minor abnormalities (below the detection resolution)
• Language barriers may lead to misunderstandings about the test items; it is advisable to choose a center with Chinese coordinators

Examination Reminder

Before deciding to go to Georgia for PGT, it is recommended to complete the following basic tests in China:

• Peripheral blood karyotype analysis for both partners (to rule out structural abnormalities like balanced translocations)
• Female: AMH, FSH, LH, antral follicle count (to assess ovarian reserve)
• Male: Semen analysis + sperm morphology + DNA fragmentation index (high fragmentation may affect embryo quality)
• Full infectious disease panel (HIV, Hepatitis B, Hepatitis C, Syphilis, etc.)

These test results are usually valid for 3-6 months and can save time and costs in Georgia.

Doctor's Advice

PGT is a tool in assisted reproduction, not a mandatory option. For patients without clear indications of chromosomal abnormalities, undergoing PGT solely for "gender selection" or "peace of mind" may not be worthwhile — considering the waiting time after biopsy, freezing costs, and potential embryo loss. If you have been trying to conceive for over a year without success, are aged 35 or older, or have had two or more miscarriages, first seek genetic counseling in China before deciding whether to go to Georgia for PGT screening.

Suggestions for Next Steps

If you still have questions after reading this article, it is recommended to:

1. Bring your recent medical reports and genetic counseling opinions from a tertiary hospital, and contact 2-3 Georgian reproductive centers for video consultations.
2. Request a detailed testing plan and fee schedule (clearly stating whether it includes PGT-A, PGT-SR, or PGT-M).
3. Confirm the laboratory transport process: whether biopsy samples are sequenced locally or sent to an international laboratory (e.g., Cyprus, Greece).
4. Inquire whether there is a refund or discount policy if all embryos are abnormal (some centers offer insurance packages).

Remember: every technology has its limits, and rational decision-making is the first step to success.