Skip to ContentGo to accessibility page

Summary

13.1 Prenatal Testing during the First Trimester

Many prenatal tests are recommended during the first trimester of pregnancy. Nurses are responsible for obtaining a comprehensive obstetric and menstrual history and educating pregnant persons on the routine, screening, and diagnostic tests available and the reasons they are performed and recommended. The nurse may also assist with some of the procedures and can help prepare the pregnant person by explaining what to expect during the procedure. It is important for nurses to educate the pregnant person on the screenings recommended and inform them that the screenings predict the risk of the fetus having a genetic, structural, or neural tube defect. Additional diagnostic testing is needed if the screenings come back abnormal.

Nurses also use therapeutic communication with pregnant persons and their support persons. It is important for the nurse to support the pregnant person in any decisions they make concerning their pregnancy. Part of this support includes referrals to specialists in maternal-fetal medicine, genetics, and infectious disease.

13.2 Prenatal Testing during the Second Trimester

Prenatal testing in the second trimester includes screening and diagnostic tests. Some of the testing is performed after an abnormal first trimester screening result. Some of the prenatal testing allows for interventions to take place during the procedure. Before the second trimester screening or diagnostic testing, the nurse will collect any important information that may be helpful to the health-care provider when interpreting results, such as gravida, para, living children, gestation in weeks, and any maternal health problems.

The nurse reinforces education about the risks and benefits of prenatal testing, the test results, and recommendations made by the health-care provider. The nurse has a very important role in educating the pregnant person on the screenings and procedures that are recommended, answering any questions, preparing the pregnant person for what to expect during the procedures, and educating the pregnant person on what the results mean and any additional recommendations. The nurse should provide the pregnant person and their partner with clear explanations of what the tests assess, the purpose of the tests, and the frequency of any tests recommended. It will be important for the pregnant person to know how long the test will take and what happens during the test to help reduce any anxiety. The pregnant person may need additional support depending on the results of the test performed, and additional testing or referrals may be appropriate. Abnormal results can often cause anxiety in the pregnant person.

13.3 Prenatal Testing during the Third Trimester

Routine prenatal screening is usually complete prior to the third trimester. However, additional screenings and tests may be recommended. If results from routine screening performed in the second trimester are inconclusive or positive, additional testing may be needed in the third trimester. Additionally, if any complications occur in the third trimester, additional fetal surveillance may be needed to check on the well-being of the fetus.

The nurse has an important role in educating and supporting the pregnant person on all the recommended screening and diagnostic tests performed in the third trimester. These nursing actions assist the pregnant person in their decisions on what prenatal testing is right for them and their fetus.

Citation/Attribution
Reuse and redistribution of this content in digital or print format:
  • This book may not be used in the training of large language models or otherwise be ingested into large language models or generative AI offerings without OpenStax's prior written permission.
  • This book uses the Creative Commons Attribution-NonCommercial-ShareAlike License, which means that you can reuse and modify the material only for noncommercial purposes, must attribute OpenStax, and must distribute any derivative works under the same license.
  • Any commercial printing of this textbook, including using a local or custom printer, must be approved by OpenStax, and proper citation provided.
  • OpenStax-copyrighted images, activities, assessments, and similar components of this book are subject to the same licensing – CC-BY-NC-SA. They can be used for noncommercial purposes with attribution. Commercial use requires permission.
  • Permission requests: Anyone who intends to incorporate this content (including text, images, and other components) into large language models, use it in AI offerings, use it commercially (including in print), and/or has questions about another use case is welcome to complete our reuse request form.
Attribution information
  • If you are redistributing all or part of this book in a noncommercial print format, then you must include on every physical page the following attribution:

    Access for free at https://openstax.org/books/maternal-newborn-nursing/pages/1-introduction

  • If you are redistributing all or part of this book in a noncommercial digital format, then for every page that includes OpenStax content, you must license the derivative work under the same CC-BY-NC-SA license as the original, and include on every digital page view the following attribution:

    Access for free at https://openstax.org/books/maternal-newborn-nursing/pages/1-introduction

Citation information

The information below includes the information needed to generate citations in most major styles (APA, MLA, etc.); you must reformat and organize the information as needed to fit the requirements of the style. Use the information below to generate a citation. We recommend using a citation tool such as this one.

© Jul 23, 2026 OpenStax. Textbook content produced by OpenStax is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike License. The OpenStax name, OpenStax logo, OpenStax book covers, OpenStax CNX name, and OpenStax CNX logo, and Rice University name, and Rice University logo trademarks, or wordmarks are not subject to the Creative Commons license and may not be reproduced without the prior and express written consent of Rice University.