Fundal Height Measurement: Maternity Nursing Review for NCLEX
What is Fundal Height and Why is it Important?
Fundal height is a measurement used to assess fetal growth and estimate gestational age. It helps determine if the baby is growing properly as the pregnancy progresses. This measurement is a key component of Essential NCLEX Preparation Strategies: Tips and Resources for Nursing Students for the maternity nursing section.
How to Measure Fundal Height
Key Landmarks
- Symphysis Pubis: Cartilage joint between the pubic bones.
- Fundus: The top portion of the uterus.
Measurement Procedure
- Position the patient: Have the mother lie on her back.
- Watch for supine hypotension: As the pregnancy progresses, lying flat can compress major vessels, causing dizziness, nausea, or lightheadedness.
- Use a tape measure: Extend from the symphysis pubis to the fundus.
- Compare to gestational age: The measurement (in centimeters) should match the weeks of gestation (give or take 2 cm) after 20 weeks.
Fundal Height During Pregnancy
| Gestational Age | Expected Fundal Height Location | Key Takeaway for Exams | | :--- | :--- | :--- | | 12 weeks | Above the symphysis pubis | Just palpable above the pubic bone. See Nursing 351 OB Terminology: Gravida, Para, Trimester & Abbreviations for trimester definitions. | | 16 weeks | Midway between the symphysis pubis and the bellybutton (umbilicus) | The halfway point between 12 and 20 weeks. | | 20 weeks | At the umbilicus (bellybutton) | Measurement in cm begins to match weeks of gestation (±2 cm). | | 20-36 weeks | Fundal height (cm) ≈ gestational age (±2 cm) | Common test question: At 26 weeks, fundal height should be 24-28 cm. | | 36 weeks | At the xiphoid process (bottom of sternum) | Can cause shortness of breath due to crowding of the lungs. | | 37-40 weeks | Regression: Fundal height drops ~4 cm | Baby settles into the pelvic cavity (lightening) in preparation for birth. |
Fundal Height After Pregnancy (Postpartum Involution)
After delivery, the uterus returns to its pre-pregnancy size. The fundal height decreases predictably. Understanding the placental role in pregnancy can be helpful; see Understanding Placenta Development and Hormonal Functions for more context.
- 1 hour postpartum: Fundus is at the bellybutton (umbilicus).
- Daily decrease: Fundus descends approximately 1 cm per day.
- 24 hours postpartum: 1 cm below the umbilicus
- 48 hours postpartum: 2 cm below the umbilicus
- Day 7 postpartum: Fundus returns to the symphysis pubis.
- 10-14 days postpartum: Uterus enters the pelvic cavity and can no longer be palpated.
- 6 weeks postpartum: Uterus is back to its pre-pregnancy size.
Key Points for NCLEX & Lecture Exams
- After 20 weeks: The fundal height in centimeters should equal the weeks of gestation, ±2 cm.
- Post-regression: Remember that fundal height drops after 36 weeks as the baby engages in the pelvis.
- Postpartum: The key numbers are 1 cm per day descent and the day 7 return to the symphysis pubis. For related postpartum concerns, such as after procedures, see Impact of Abnormal Smears and Loop Biopsy on Fertility and Pregnancy.
- Patient Safety: Always monitor for signs of supine hypotension when the patient is lying on her back. Practicing Mastering Vital Signs: A Comprehensive Guide for Nurses will help you monitor for complications like supine hypotension.
Additional Recommended Resource
- Mastering Vital Signs: A Comprehensive Guide for Nurses
- Understanding Placenta Development and Hormonal Functions
- Impact of Abnormal Smears and Loop Biopsy on Fertility and Pregnancy
- Nursing 351 OB Terminology: Gravida, Para, Trimester & Abbreviations
- Essential NCLEX Preparation Strategies: Tips and Resources for Nursing Students
this is Sierra threats Turner's Orion comm and in this video I want to be doing a quick review over fundal height
and this video is part of an Inc Lex review series over a maternity nursing and as always after you watch this video
don't forget to take the free quiz so let's get started what does fundal height and why do we care about it okay
the purpose of measuring of fundal height is to assess how well that baby is growing is the baby growing properly
depending on how far a long mom is in addition it helps us determine gestational age now how do we measure it
well to measure I want you to remember two important landmarks we want to remember the symphysis pubis and the
fundus of the uterus now the symphysis pubis is a cartilage joint found in between the pubic bone
and the fundus is the top part of the uterus and when we measure this we measure in centimeters so how do we do
this well first what you want to do is you want to lay the patient on their back now as mom is progressing in her
pregnancy baby's getting bigger everything is getting bigger and you want to watch out for hypotension
because whenever you lay her back that can compress those major vessels and she can have hypotension so watch out for
any dizziness she's reporting nausea feeling light-headed anything like that then what you want to do is you want to
get a tape measure and extend that tape measure from the symphysis pubis to the fundus and after doing this we want to
make sure that that location of that fundus or that measurement of that fundus matches the gestational age and
one thing to keep in mind is that after 20 weeks once that fundus goes past the belly button that the measurement will
actually start to match how far along the mom is give or take to centimeters so now I want to hit on some main
concepts that you'll want to remember for those maternity lecture exams and for the NCLEX exam and what I want you
to really remember are the locations of where this fundal height should be versus the weeks of pregnancy and what I
want to be doing is I'm going to be talking about during see and then I want to end it and wrap
it up with after pregnancy where that fundal height should be after the delivery of the baby because you want to
know that as well so first let's talk about during okay where should the fundus be at about 12 weeks of pregnancy
it should be above the symphysis pubis so about in this area right here remember the since this pubis was that
cartilage joint in between the pubic bone now as the pregnancy progresses and she hits about 20 weeks of pregnancy
where would you find the fundus at about the bellybutton so we know if we were looking at the fundus that if we find it
in between the symphysis pubis and the bellybutton but how far along is this mother she's about 12 to 20 weeks
because that's about the measurement so the halfway point between that let's say you have a test question and it says
you're looking at fundal height and you find it to be in between the symphysis pubis and the bellybutton about how far
along is she will it be about 16 weeks because that's our halfway point now as always talking about earlier after 20 to
36 weeks that fundal height will reflect the weeks of pregnancy give or take to centimeters so Popular's house question
would be you have a mother she's 26 weeks pregnant where would you expect that fundal height to be okay well it
can be plus or minus 2 ms centimeters so she's 26 weeks pregnant it can be anywhere between 24 centimeters to 28
centimeters so remember that key concept because tests love to ask that now at about 36 weeks pregnant where would you
expect the fundal height to be at the xiphoid process mom is probably gonna have some issues breathing cuz it's up
there where her lungs are a lot of crowding now after this time about room 37 to 40 weeks the fundal height is
actually going to regress it's going to go down about 4 centimeters now why is this why's it going to go
well body is preparing for birth the baby has settled down into the pelvic cavity
so the fungal height decreases a little bit during that time now let's look at where the fundal height should be after
pregnancy so after delivery of the baby until it gets back to its pre pregnancy size okay about one hour after birth you
should expect the fundal height to be at the bellybutton so if you have a test question that says mom is one hour
postpartum where should the fundal height be should be at the bellybutton now as time goes on the fundal height
will decrease one centimetre per day so it'll start decreasing one centimetre per day so if the woman is 24 hours
postpartum where should that fundal height be it should be one centimeter below the bellybutton she's 48 hours
postpartum it should be 2 centimeters below the bellybutton now where should it be back at the
symphysis pubis at 7 day so around 7 days this is about where you should expect it then the uterus is going to
start entering back into the pelvic cavity so you're not going to be able to palpate the fundus any longer this
occurs about 10 days to 14 days depending on the woman and at 6 weeks it should be back the uterus should be back
at its pre pregnancy sighs okay so that wraps up this review over fundal height thank you so much for watching don't
forget to take the free quiz and to subscribe to our channel for more videos
To measure fundal height, have the patient lie supine and locate the symphysis pubis and fundus (top of the uterus). Use a tape measure from the symphysis pubis to the fundus. After 20 weeks of gestation, the measurement in centimeters should correspond to the gestational age, plus or minus 2 centimeters. Always monitor the patient for supine hypotension, as lying flat can compress major vessels.
At 12 weeks, the fundus is just palpable above the symphysis pubis. At 16 weeks, it is midway between the symphysis pubis and the umbilicus. At 20 weeks, it reaches the umbilicus. At 36 weeks, it is at the xiphoid process (bottom of the sternum), which can cause shortness of breath due to lung crowding.
Between 37 and 40 weeks, fundal height drops approximately 4 centimeters as the baby settles into the pelvic cavity (lightening) in preparation for birth. This regression is significant for NCLEX exams because it distinguishes normal late pregnancy changes from potential complications.
Postpartum, the fundus descends about 1 centimeter per day. At 1 hour postpartum, it is at the umbilicus. By day 7, it returns to the level of the symphysis pubis. The uterus becomes non-palpable by 10–14 days and returns to its pre-pregnancy size by 6 weeks postpartum.
Any pregnant patient lying supine should be monitored for supine hypotension, which can cause dizziness, nausea, or lightheadedness due to compression of major vessels. Additionally, ensure the tape measure is correctly positioned from the symphysis pubis to the fundus, avoiding parallax errors.
After 20 weeks, the fundal height in centimeters should equal the gestational age in weeks, plus or minus 2 centimeters. For example, at 26 weeks, a normal fundal height range is 24–28 centimeters. This rule applies until 36 weeks, after which fundal height regresses.
During pregnancy, fundal height increases steadily, matching gestational age after 20 weeks and peaking at 36 weeks. Postpartum, it decreases predictably by 1 cm per day, returning to the symphysis pubis by day 7 and becoming non-palpable by 10–14 days.
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