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RhD genotyping via IVF PGT
I am Rh-negative and already Rh-sensitized (anti-D antibodies present). My husband is Rh-positive and heterozygous (Dd). We were considering IVF with Preimplantation Genetic Testing (PGT) to select Rh-negative embryos to avoid hemolytic disease in future pregnancies.
However, my doctor advised that this is not possible. I have read that PGT-M can be used for single-gene conditions, and RHD genotyping may be technically feasible.
Is embryo RhD genotyping through IVF + PGT technically possible in India?
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This is a complex clinical and ethical scenario, and your proactive approach to understanding PGT-M (Preimplantation Genetic Testing for Monogenic disorders) is commendable.
The Technical vs. Legal Reality
Technically, you are correct: RHD genotyping through IVF and PGT-M is scientifically feasible. Since your husband is heterozygous (Dd), there is a 50% chance of producing an Rh-negative (dd) embryo that would be safe from hemolytic disease.
However, the primary hurdle in India is the PNDT (Pre-Conception and Pre-Natal Diagnostic Techniques) Act:
Rh status is linked to sex-linked chromosomes: In some contexts, the testing of blood group antigens is restricted because it could be misused for gender selection.
Strict Regulations: Most IVF centers in India do not offer PGT for Rh status because the law strictly prohibits any genetic testing that is not for "serious" life-threatening genetic disorders. Many authorities do not classify Rh incompatibility in this category since medical management (like intrauterine transfusions) exists.
Recommended Next Steps
Consult a Fetal Medicine Specialist: They can provide a detailed prognosis for future pregnancies and explain the latest protocols for managing sensitized pregnancies.
Genetic Counseling: Meet with a certified genetic counselor who specializes in the PNDT Act to see if your specific case—given you are already Rh-sensitized—could qualify for a legal exception at a specialized center.
Explore Management Options: If PGT is not an option, discuss non-invasive prenatal testing (NIPT) to check the fetus's Rh status early in a natural pregnancy.
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