IVF itself is not eugenics, but some applications of the technology raise legitimate questions about where medicine ends and selective breeding begins. The distinction hinges on who is making the choices, why, and how far the selection goes. Standard IVF simply helps people conceive a child they otherwise couldn’t. It’s the genetic testing options layered on top of IVF that push into ethically complex territory.
What Eugenics Actually Means
Eugenics, as practiced throughout the 20th century, was a state-run program. Governments decided which people should reproduce and which shouldn’t, based on pseudoscientific ideas about racial purity, intelligence, and “fitness.” Forced sterilizations, immigration restrictions, and marriage bans were the tools. The core feature was coercion: individuals had no say in whether they could have children.
Modern philosophers draw a sharp line between this “authoritarian” eugenics and what some call “liberal” eugenics. Liberal eugenics, as described in the Stanford Encyclopedia of Philosophy, is based on individual free choice and pluralist values. Parents decide what they want for their own children rather than the state deciding what society should look like. The aim is to expand reproductive choices, not restrict them. Critics argue this distinction is less clean than it sounds, a point worth examining closely.
How Genetic Testing Works in IVF
Most IVF cycles today involve some form of genetic screening. At one center that tracked its data over a decade, the proportion of IVF cycles using preimplantation genetic testing rose from 0.2% in 2015 to nearly 73% in 2024. Three types of testing exist, each with a different purpose.
The first, PGT-A, screens embryos for the wrong number of chromosomes. Embryos with too many or too few chromosomes typically don’t implant, or they result in miscarriage or conditions like Down syndrome. The goal is to transfer an embryo most likely to produce a healthy pregnancy, particularly for people over 35 or those with a history of miscarriage.
The second, PGT-M, looks for specific genetic diseases that run in a family. If both parents carry the gene for cystic fibrosis, for example, PGT-M identifies which embryos inherited two copies of the mutation and which didn’t. It works for any single-gene disorder where the responsible gene is known: Huntington’s disease, Duchenne muscular dystrophy, sickle cell disease, and even high-risk cancer genes like BRCA.
The third, PGT-SR, checks for chromosomal rearrangements like translocations or deletions. Parents who carry these rearrangements often experience repeated miscarriages, and this testing identifies embryos with a normal or balanced chromosome structure.
None of these involve altering genes. They involve choosing which embryo to transfer based on its existing genetic profile.
Where the Eugenics Comparison Gains Traction
The comparison becomes harder to dismiss when selection moves beyond preventing serious disease. Sex selection is the clearest example. The American Society for Reproductive Medicine has called nonmedical sex selection “ethically controversial” and says clinics should not encourage it, though it stops short of banning the practice outright. Clinics are left to set their own policies, and many in the United States offer it freely.
A newer and more unsettling development is polygenic screening, sometimes called PGT-P. Instead of looking for a single disease gene, this approach uses statistical models to estimate an embryo’s risk for complex conditions influenced by hundreds or thousands of genes: heart disease, diabetes, schizophrenia, even height and cognitive ability. The company that pioneered commercial polygenic embryo screening acknowledged that traits like height and cognitive ability are “too controversial” and chose to limit its offerings to disease risk. But the technology doesn’t inherently stop at disease.
This is the slippery slope that concerns ethicists. If you can rank embryos by their statistical likelihood of developing diabetes, you can, in principle, rank them by predicted IQ. The predictive power for complex traits remains weak, and the science is nowhere near reliable enough to guarantee outcomes. But the intent to select for non-medical traits is what makes the eugenics label stick.
The Therapy vs. Enhancement Problem
Nearly every professional ethics body, from national science academies to medical societies, draws the line between “therapeutic” uses and “enhancement.” Screening out a fatal childhood disease sits on one side. Selecting for above-average height sits on the other. This seems intuitive, but the boundary is genuinely blurry.
Is selecting against an embryo with a strong genetic predisposition to breast cancer therapeutic or enhancement? What about selecting against a moderate risk of depression? What about deafness, which many in the Deaf community do not consider a disease at all? These aren’t hypothetical dilemmas. They are decisions fertility clinics face now.
The UK takes the strictest approach among major countries. Its Human Fertilisation and Embryology Authority has ruled that polygenic screening is not lawful because the conditions it claims to predict don’t meet the legal requirement of a “particular risk” of a “serious condition.” Testing is only permitted when parents or their family are known carriers of a serious heritable disease. The United States has no equivalent federal regulation, leaving these decisions largely to clinics and patients.
The Disability Rights Objection
Disability rights advocates raise what philosophers call the “expressivist objection”: that selecting against embryos with genetic conditions sends a message about the worth of people already living with those conditions. The argument is that systematically screening out Down syndrome, dwarfism, or deafness tells people with those traits that their lives are less valuable or shouldn’t exist.
Members of the disability rights movement hold that living with disabling traits need not be detrimental to a person’s prospects for a worthwhile life, to their families, or to society. When an entire society treats certain genetic profiles as problems to eliminate, the effect mirrors one goal of historical eugenics: reducing the prevalence of traits deemed undesirable. The key difference is that no one is being forced. The key similarity is the outcome.
This tension has no clean resolution. Parents making decisions about their own pregnancies are exercising reproductive autonomy. But when millions of parents independently make the same choices, guided by the same cultural assumptions about which lives are worth living, the collective result can look a lot like a eugenic program without a central planner.
What Makes IVF Different From Historical Eugenics
Several features separate modern IVF practices from the eugenics programs of the past. No government is mandating who can reproduce. No one is sterilized against their will. Parents are choosing from their own embryos, not being told their genetic line should end. The decisions are private, voluntary, and made in the interest of a specific family rather than a societal blueprint.
The philosopher Julian Savulescu has argued that parents are actually morally obligated to select the embryo with the best chance of the best life, a principle he calls “procreative beneficence.” Under this view, not using available genetic information is the ethically questionable choice. Most bioethicists don’t go that far, but the argument illustrates how the same technology can be framed as either a moral duty or a eugenic impulse depending on your starting assumptions.
The honest answer to “is IVF eugenics” is that basic IVF, helping sperm meet egg, is not. Screening for fatal single-gene diseases occupies widely accepted ethical ground. But as genetic testing becomes more powerful and its targets expand from deadly childhood conditions to complex traits and statistical risk profiles, the distance between individual reproductive choice and population-level selection narrows. The technology is not eugenic by nature. Whether it becomes eugenic depends entirely on how far societies allow selection to go and who gets to decide.