Pregnant Participants & Fetuses
Research involving pregnant participants and human fetuses must meet specific criteria related to risk, potential for direct benefit, and consent, as outlined in 45 CFR 46 Subpart B. There may be different criteria and considerations depending on whether pregnant individuals and fetuses are the target population in the research or if they may be incidentally enrolled.
- If pregnant individuals and fetuses are included as part of the target research population:
- The IRB application should address the potential risks and benefits to pregnant participants and the fetus.
- The acceptable level of risk and parental signature requirements depend on the prospect of direct benefit to either the pregnant participant or the fetus.
| Prospect of Direct Benefit | Acceptable Level of Risk | Signature Requirements |
|---|---|---|
| Prospective of direct benefit only to the pregnant participant | Research may involve greater than minimal risk to the fetus | Signature of pregnant participant |
| Prospective of direct benefit only to the fetus | Research may involve greater than minimal risk to the fetus | Signature of pregnant participant and father (with certain exceptions) required |
| No prospect of direct benefit to either the pregnant participant or fetus | Only minimal risk to the fetus may result from the research | Signature of pregnant participant |
- If individuals who can become pregnant are included in the research:
- The IRB application should include any conditions for inclusion or exclusion of individuals who can become pregnant.
- For treatment and interventional studies, the consent form should describe any known risks to the participant and to the embryo or fetus if the participant is or becomes pregnant, or a statement if the risks are unknown.
- The consent form should include any measures taken to minimize risks if the participant is or may become pregnant, including required methods of contraception, as applicable.
- If pregnant individuals and those who can become pregnant are excluded from the research:
- The IRB application should state how the researchers will confirm pregnancy (i.e. self-report, urine or blood pregnancy test).
- The rationale for excluding this population should be included in the application.
Frequently Asked Questions
Under 45 CFR 46.204, pregnant individuals or fetuses may be involved in research if all of the following are met:
- Where scientifically appropriate, preclinical studies, including studies on pregnant animals, and clinical studies on non-pregnant individuals, have been conducted and provide data for assessing potential risks to pregnant individuals and fetuses;
- The risk to the fetus is caused solely by interventions or procedures that hold out the prospect of direct benefit for the pregnant individual or the fetus; or, if there is no such prospect of benefit, the risk to the fetus is not greater than minimal and the purpose of the research is the development of important biomedical knowledge which cannot be obtained by any other means;
- Any risk is the least possible for achieving the objectives of the research;
- If the research holds out the prospect of direct benefit to the pregnant individual, the prospect of a direct benefit to the pregnant individual and the fetus, or no prospect of benefit for the pregnant individual nor the fetus when risk to the fetus is not greater than minimal and the purpose of the research is the development of important biomedical knowledge which cannot be obtained by any other means, her consent is obtained;
- If the research holds out the prospect of direct benefit solely to the fetus then the consent of the pregnant individual and the father is obtained, except that the father’s consent need not be obtained if he is unable to consent because of unavailability, incompetence, or temporary incapacity or the pregnancy resulted from rape or incest;
- Each individual providing consent is fully informed regarding the reasonably foreseeable impact of the research on the fetus or neonate;
- For children who are pregnant, assent and permission are obtained in accord with 46 CFR 45 subpart D;
- No monetary or other inducements will be offered to terminate a pregnancy;
- Individuals engaged in the research will have no part in determining the viability of a neonate.
Clinical researchers are often interested in evaluating whether the investigational drugs, devices, or procedures have effects on the pregnant partners of enrolled participants,and fetuses. Based on HHS and FDA definitions, and consistent with the Secretary’s Advisory Committee on Human Research Protections (SACHRP), the Stanford IRB does not consider the collection of safety data from an individual who becomes pregnant during their partner’s research participation, in and of itself, to constitute human subjects research. IRB protocols do not need to indicate that pregnant individuals will be included as research participants.
- HHS regulations: the collection of data from the pregnant partner and child solely for safety purposes would not contribute to generalizable knowledge, and therefore, does not meet the definition of research. However, if other activities occur for research purposes, then they may be considered a research participant.
- FDA regulations: the pregnant partner and child are not the recipients of the test article(s), thus the pregnant partner and child do not meet the definition of a human subject under FDA regulations.
If a partner of a research participant becomes pregnant, a prompt Report Form should be submitted to the IRB at the time the study team becomes aware of the event and the pregnancy has been confirmed. If the pregnant partner’s involvement is limited to the collection of safety data, a HIPAA Authorization will need to be obtained for the collection of protected health information (PHI). The HIPAA Authorization should state the purpose of the activity as the collection of information about the pregnant partner, fetus and/or child, not the purpose of the clinical investigation. Please consult with Stanford University Privacy for guidance on the HIPAA Authorization and use of PHI before proceeding with the collection of data from the pregnant partner.
Pregnant individuals and fetuses may only be involved in research if all the requirements outlined in the VHA Directive 1200.05 are met.
- For interventional or invasive monitoring studies, this includes certification from the VA medical facility Director that the VA medical facility has sufficient expertise in reproductive health to conduct the proposed research.
- Research on either a fetus or human fetal tissue cannot be conducted by VA investigators while on official duty, or at VA facilities, or at approved off-site facilities.
- Research related to in vitro fertilization may be conducted by VA investigators while on official duty, or at VA facilities, or at approved off-site facilities.
- Research on neonates must be limited to minimal risk and noninvasive monitoring and cannot include interventions while VA investigators are on official VA duty, at VA facilities, or at approved off-site facilities.
Potential participants should be informed of any reasonably foreseeable risks related to the research. Pregnancy testing and outcomes are often tracked in treatment and interventional studies for participant safety monitoring. Disclosure of this information may result in potential legal risks for pregnant participants and participants who can become pregnant. The consent form should disclose what pregnancy related information will be recorded, who it may be shared with, any limitations on confidentiality, and if legal concerns could arise from the disclosure of this information.
Research that does not meet the requirements outlined above for pregnant participants and human fetuses, but presents an opportunity to understand, prevent, or alleviate a serious problem affecting the health or welfare of these participants will require approval from the HHS Secretary (45 CFR 46.207).
Resources
- Stanford Research Policy Handbook (RPH) - People of Childbearing Potential as Subjects in Research
- FDA - Division of Pediatrics and Maternal Health - Clinical Trials in Pregnant Women
- FDA Guidance - Inclusion of Pregnant and Breastfeeding Women in Clinical Trials
Page updated July, 2026