Fertility Preservation and Catholic Teaching

This page is for Catholic patients, and parents of young patients, who want to protect fertility before cancer treatment and want to know where Church teaching stands on each option. It covers timing, each method, and who to ask for guidance.

Whatever your beliefs, one fact drives the rest. NCI advises talking about fertility before cancer treatment starts, because many options cannot be done once treatment begins. If having children later matters to you, or might, raise it at the first oncology appointment. Ask for the referral right away.

Some people put off the conversation until they have worked out what they believe. Often the calendar decides for them. Ask for the referral first. You can turn down any option once you know what the options are.

The methods are not all treated the same way. The answer depends on which one is on the table. It is not helpful to be told "the Church is against fertility treatment." That flattens real distinctions. It can leave someone turning down an option nobody ever objected to.

This is the clearest case. Embryo freezing (also called cryopreservation) means creating embryos in a lab through in vitro fertilization (IVF) and freezing them. Dignitas Personae, the Vatican's 2008 instruction, states:

Cryopreservation is incompatible with the respect owed to human embryos; it presupposes their production in vitro; it exposes them to the serious risk of death or physical harm, since a high percentage does not survive the process of freezing and thawing; it deprives them at least temporarily of maternal reception and gestation.

The 1987 instruction Donum Vitae had already called embryo freezing "an offence against the respect due to human beings." The 2025 Ethical and Religious Directives repeat the ban for Catholic facilities. There is no ambiguity here.

A couple may be offered embryo banking before chemotherapy. This is the option that meets the most direct objection.

Here the objection is less about the freezer. It is about two other things: how the sample is collected, and what it would be used for later.

Donum Vitae deals with the first. It says masturbation separates the act from its unitive meaning. That holds even when the goal is having a child. The second point, what the sample would be used for later, depends on the method. The documents cited here object to embryo freezing, so ask an ethicist how this applies to your plan.

This is the area where individual guidance matters most. A patient will get a more useful answer from a Catholic ethicist than from a website. And it is worth saying plainly: people in this situation are not choosing between virtue and children. They are trying to make a decision under time pressure, with incomplete information. That is exactly what ethics consultation services are for.

These are treated differently, and the difference turns on purpose. Dignitas Personae rejects "cryopreservation of oocytes for the purpose of being used in artificial procreation." Oocytes are eggs. Directive 39 of the 2025 Ethical and Religious Directives bars "the cryopreservation of human gametes for the purpose of immoral methods of reproduction." Gametes are eggs and sperm.

Both statements hinge on purpose. Neither is a flat ban on freezing. Suppose eggs were frozen for a later use the tradition would accept. Catholic bioethicists have asked whether that falls outside the ban. That question is not settled the way the embryo question is settled.

The documents cited here do not speak directly to freezing ovarian or testicular tissue. NCI lists ovarian tissue freezing as an option, mainly for girls before puberty or people who cannot delay treatment. Testicular tissue freezing is still in clinical trials. Ask a Catholic ethicist how teaching applies. Ask your team what is really available at your center.

Catholic hospitals follow the 2025 Directives. Directive 39 bars freezing embryos. Under Directive 27, staff may not refer you elsewhere for an intervention that is not in accord with Catholic teaching. They should still help transfer your care safely to a provider you have chosen on your own.

In practice: if preservation is a priority, find an outside fertility clinic early. Ask your oncology team to send records promptly. Do not assume the referral will be made for you.

Three sources, and use more than one:

• Your oncology team, for what your treatment is likely to do to fertility and how much time you have.
• A fertility specialist, for what is actually possible in that time.
• A Catholic ethicist, for your situation specifically. Ask whether your hospital offers an ethics consultation.

A parish priest may or may not be the right person for this. Some are well informed on medical ethics and some are not. A confident wrong answer under time pressure is worse than no answer.

This comes up in childhood and teenage cancer, and it is genuinely hard. You are deciding about someone else's future family. Quickly. On their behalf. At the worst moment of your life. Ask the oncology team whether tissue preservation is an option for your child. Ask for an ethics consultation too. And if the young person is old enough, ask for a conversation that includes them.

• NCI — Fertility Issues in Girls and Women with Cancer
• NCI — Fertility Issues in Boys and Men with Cancer
• Congregation for the Doctrine of the Faith — Dignitas Personae
• Congregation for the Doctrine of the Faith — Donum Vitae
• USCCB — Ethical and Religious Directives for Catholic Health Care Services, Seventh Edition