There is no reliable national count of how many abortions are performed for strictly medical reasons, because the U.S. does not systematically track the clinical indication behind each procedure. What is clear is that “medically necessary” covers a broader range of situations than many people assume, and that the line between medical necessity and other reasons is far less distinct than the public debate suggests.
Why There Is No Definitive Number
Neither the CDC nor state health departments consistently require clinicians to document why an abortion was performed in a way that distinguishes “medically necessary” from other categories. The CDC tracks abortion by gestational age and method but does not break down the data by indication. KFF, a leading health policy research organization, has noted that inadequate data exist to know how many abortions later in pregnancy occur due to fetal anomalies alone, let alone how many across all gestational ages are driven by maternal health threats.
Part of the difficulty is definitional. A pregnancy that worsens a heart condition may not present as an acute emergency today but could become fatal within weeks. A fetal diagnosis incompatible with life outside the womb does not threaten the pregnant person’s survival in the same way a ruptured ectopic pregnancy does, yet carrying that pregnancy to term carries real physical and psychological consequences. Whether both count as “medically necessary” depends entirely on who is drawing the line.
What Clinicians Mean by Medical Necessity
The American College of Obstetricians and Gynecologists, the main professional body for OB-GYNs in the U.S., states plainly that “there are situations where pregnancy termination in the form of an abortion is the only medical intervention that can preserve a patient’s health or save their life.” Pregnancy places significant physiological demands on the body. It can worsen preexisting conditions like kidney disease, heart disease, uncontrolled diabetes, and certain autoimmune disorders to the point where continuing the pregnancy becomes dangerous.
Cancer diagnosed during pregnancy is another well-recognized scenario. Some cancers require immediate chemotherapy or radiation that would cause severe harm to a developing fetus, forcing a choice between delaying treatment (which can be life-threatening) and ending the pregnancy. Severe preeclampsia, placental abruption, and sepsis from incomplete miscarriage are additional situations where termination may be the only effective treatment.
Ectopic pregnancies, which occur in roughly 1 to 2 percent of all pregnancies, are always nonviable and can be fatal without intervention. Treatment for an ectopic pregnancy is not always legally classified as an abortion, but it involves the same medications or surgical techniques, and the distinction has caused confusion in states with restrictive laws.
Severe Fetal Diagnoses
A substantial share of medically indicated abortions involves fetal conditions that are incompatible with life outside the womb. Conditions like anencephaly (where most of the brain fails to develop), bilateral renal agenesis (where the kidneys do not form), and certain severe chromosomal abnormalities fall into this category. A study at El Salvador’s National Women’s Hospital reviewed 239 pregnancies over six years involving fetuses with one of 18 congenital malformations typically considered lethal. Because El Salvador has a total abortion ban, all of those patients were required to continue their pregnancies. The result was high rates of maternal complications, illustrating the physical toll of carrying a nonviable pregnancy to term.
Research from Washington University Hospital found that almost all women whose fetuses received a lethal diagnosis chose to terminate when that option was available. These decisions typically happen in the second trimester, after anatomy scans performed around 18 to 20 weeks reveal the abnormality. This is one reason why later abortions, though they represent a small fraction of all procedures, are disproportionately tied to medical indications.
The Risk Comparison
For context on why termination is sometimes the safer path: a 2023 study published in the journal Contraception calculated that staying pregnant in 2020 was 35 to 39 times deadlier than having an induced abortion, based on mortality data from 2013 to 2019 showing 0.43 deaths per 100,000 abortions. That comparison applies to pregnancy overall, not just high-risk cases. For someone with a serious underlying condition, the gap between the risks of continuing versus ending the pregnancy widens considerably.
How State Laws Define It Differently
The legal definition of “medically necessary” varies dramatically by state and is often narrower than the clinical one. Florida’s law, for example, allows abortion after six weeks only when two physicians certify that termination “is necessary to save the pregnant woman’s life or avert a serious risk of substantial and irreversible physical impairment of a major bodily function.” It explicitly excludes psychological conditions. In an emergency where a second physician is unavailable, the treating doctor can proceed alone but must document the reasoning in the medical record.
This kind of language creates a gap between what a clinician considers medically necessary and what the law permits. A condition that is clearly worsening and will likely become life-threatening may not yet meet the legal threshold of “imminent” danger. Physicians in restrictive states have reported delaying intervention until patients deteriorate enough to satisfy the legal standard, which can lead to worse outcomes, longer hospital stays, and higher complication rates.
The Supreme Court addressed a related dynamic decades ago. In its 1973 decision in Doe v. Bolton, the Court struck down hospital policies that required approval from an abortion committee before a physician could perform the procedure, ruling that mandating concurrence from a group of physicians was an unconstitutional barrier. Yet several current state laws effectively recreate that dynamic by requiring certification from two or more doctors before a medically necessary abortion can proceed.
Estimates and What We Can Infer
Without systematic reporting, researchers have attempted rough estimates using indirect data. Abortions at or after 21 weeks account for less than 1 percent of all abortions in the U.S., and a meaningful share of those involve medical indications, either severe fetal anomalies discovered at the mid-pregnancy anatomy scan or maternal health crises that develop later. But medically necessary abortions also happen earlier in pregnancy. Ectopic pregnancies are typically treated in the first trimester. Cancer diagnoses, cardiac crises, and other maternal health emergencies can arise at any point.
A commonly cited but imprecise figure is that somewhere between 2 and 5 percent of all abortions involve a direct threat to maternal life or a lethal fetal diagnosis. That range comes from survey-based studies asking patients their primary reason for seeking an abortion, but it almost certainly undercounts medical necessity. Many patients cite multiple reasons, and a health concern that makes pregnancy risky may coexist with financial or personal factors. A person with a heart condition who also cannot afford another child may report the financial reason on a survey while the medical risk was the decisive factor.
What can be said with confidence is that the number is not trivial. With roughly 930,000 abortions performed annually in the U.S. in recent years, even a conservative 2 percent estimate translates to nearly 20,000 procedures per year where a serious medical indication was present. The true figure, accounting for underreporting and the gray zone between “life-threatening” and “health-threatening,” is likely higher.