A nurse is assessing a pregnant client at 24 weeks gestation during a routine prenatal visit and measures a fundal height of 20 cm. Which action should the nurse take first?

At 24 weeks gestation, expected fundal height is approximately 24 cm (±2 cm), correlating with gestational age. Other options indicate potential growth issues.

Core Nursing Explanation Key Concept Analysis: This question tests the assessment of fundal height during prenatal care. Fundal height, measured in centimeters from the pubic symphysis to the top of the uterine fundus, is a simple, non-invasive tool to screen for fetal growth. The general rule is that from approximately 20 to 36 weeks of gestation, the fundal height in centimeters often correlates with the gestational age in weeks (McDonald's Rule), with a normal variation of ±2 cm.

Answer Rationale: The client is at 24 weeks gestation. Therefore, the expected fundal height is approximately 24 cm. A measurement of 20 cm is 4 cm below the expected value, which falls outside the typical ±2 cm range. This discrepancy is significant and requires further assessment. Key Point! The nurse's first action is not to jump to conclusions but to ensure the accuracy of the initial finding. The most appropriate initial action is to re-measure the fundal height to verify the measurement before reporting it or initiating other interventions. This aligns with the nursing process, where accurate assessment is the foundation for all subsequent steps.

Distractor Analysis: The provided answer choices are numerical values, not actions. Based on the question stem ("measures a fundal height of 20 cm") and the correct answer being "24 cm", the question is likely asking for the expected fundal height. The nurse's first action, however, would be to verify the measurement. Since the options are only numbers, we must interpret the question as asking: "What is the expected fundal height for this client?" In that context:
• 20 cm: This is the measured value, which is concerningly low for 24 weeks.
• 24 cm: This is the correct expected value for 24 weeks gestation.
• 28 cm: This would be the expected value for 28 weeks, indicating the fetus may be larger than dates.
• 32 cm: This would be the expected value for 32 weeks, indicating significant macrosomia or inaccurate dating.

Related Concepts: A fundal height measurement that is >2-3 cm more or less than the gestational age warrants further investigation. It may indicate conditions such as Intrauterine Growth Restriction (IUGR), oligohydramnios (low amniotic fluid), fetal macrosomia, polyhydramnios (excess amniotic fluid), inaccurate gestational dating, or multiple gestation. The next steps after confirming an abnormal measurement would include a thorough maternal history, referral for a fetal ultrasound to assess growth and amniotic fluid volume, and possibly non-stress testing (NST). Concept Summary • McDonald's Rule: From ~20-36 weeks, fundal height (cm) ≈ gestational age (weeks).
• Normal Variation: ±2 cm from the gestational age.
• Significance: A quick, screening tool for fetal growth and amniotic fluid volume.
• Action for Discrepancy: First, re-measure to ensure accuracy. Then, report and facilitate further diagnostic evaluation (e.g., ultrasound). Side-by-Side Comparison!

Condition	Fundal Height vs. Dates	Possible Causes
Fundal height less than dates (e.g., 20 cm at 24 wks)	Fundal height >2-3 cm below expected	IUGR, oligohydramnios, fetal anomaly, inaccurate dating, fetal demise.
Fundal height greater than dates (e.g., 28 cm at 24 wks)	Fundal height >2-3 cm above expected	Macrosomia, polyhydramnios, multiple gestation (twins/triplets), molar pregnancy, inaccurate dating.

Anatomy, Physiology & Pharmacology Points • Uterine Growth: The uterus grows predictably during pregnancy to accommodate the fetus, placenta, and amniotic fluid. Fundal height palpation assesses this growth.
• Landmarks: Measurement is from the pubic symphysis to the top of the uterine fundus.
• Limitations: Accuracy can be affected by maternal factors (obesity, fibroids, abdominal muscle tone), fetal position, and clinician technique. Memory Tips • Mnemonic: "20 to 36, Match the Weeks" – From 20 to 36 weeks, fundal height in cm should match the weeks of gestation.
• Rule of Thumb: Think of it as a quick "tape measure test." If the number is close to the weeks, growth is likely on track. High-Frequency NCLEX Topics Fundal height assessment is a Core skill for prenatal nursing. The NCLEX often tests:
1. Knowing the expected measurement for a given gestational age.
2. Identifying the nursing action for a discrepancy (e.g., "What should the nurse do first?" – usually reassess or verify).
3. Understanding the implications of measurements that are too high or too low. Watch Out for Question Variations! • From Assessment to Action: "A client at 30 weeks has a fundal height of 26 cm. What is the priority nursing action?" (Answer: Re-measure to confirm, then notify the provider).
• Implication Identification: "A fundal height of 32 cm at 28 weeks gestation is most suggestive of which condition?" (Answer: Polyhydramnios or multiple gestation).
• Postpartum Focus: Fundal height is also assessed postpartum to monitor uterine involution. It should be at the umbilicus immediately postpartum and descend about 1 cm/day.

Nursing Clinical Practice Guide Clinical Scenario: You are a nurse in a busy prenatal clinic. Maria, a 24-year-old G1P0 at 24 weeks gestation, is here for her routine visit. She has no specific complaints. During your assessment, you measure her fundal height and get a reading of 20 cm.

Nursing Intervention Strategy:
1. Assessment (Re-assessment): Politely say, "Let me just double-check this measurement to make sure I have it right." Ensure the client has an empty bladder. Reposition her supine with a slight left lateral tilt to prevent supine hypotension. Use a non-stretchable tape measure. Measure from the symphysis pubis to the top of the fundus in a straight line. Document the measurement precisely.
2. If the re-measurement confirms 20 cm: Perform a focused assessment. Ask about fetal movement patterns. Review the client's health history (e.g., hypertension, smoking, substance use). Check her blood pressure for signs of preeclampsia.
3. Reporting and Planning: Inform the healthcare provider (MD/CNM) of the finding. The provider will likely order a fetal ultrasound to assess fetal growth (biometric measurements), amniotic fluid index (AFI), and placental appearance.
4. Patient Education and Support: Explain to Maria in a calm, non-alarming manner: "Today, your measurement is a little different than we typically see. This doesn't necessarily mean there's a problem, but it's a reason for us to take a closer look with an ultrasound to check on the baby's growth and fluid levels." Provide emotional support and answer her questions.

Patient Safety and Precautions:
• Always have the client empty her bladder before measuring for accuracy.
• Use the left lateral tilt position to prevent vena cava syndrome.
• Never use fundal height as a sole diagnostic tool. It is a screening method. Ultrasound is the diagnostic standard for growth assessment.
• Avoid causing unnecessary anxiety. Frame next steps as "further evaluation" rather than assuming a problem exists. Nursing Procedure & Medication Flow Procedure: Fundal Height Measurement
1. Explain the procedure to the client.
2. Assist client to empty bladder.
3. Position client supine with knees slightly bent. Place a small pillow under the right hip for left uterine displacement.
4. Locate the top of the fundus by palpating the abdomen from the xiphoid process downward.
5. Place the "zero" end of the non-stretch tape at the top of the pubic symphysis.
6. Stretch the tape smoothly over the contour of the abdomen to the top of the fundus.
7. Record the measurement in centimeters. Document client position and any relevant findings (e.g., fetal position palpable).

Medication Note: No specific medications are involved in this assessment. However, if IUGR is diagnosed, management may involve medications like low-dose aspirin (for prevention in high-risk women) or corticosteroids for fetal lung maturity if early delivery is anticipated. A Word from Your Senior Nurse "Trust your hands and your tape measure, but also trust the process. A single fundal height measurement is a snapshot, not the whole movie. Your critical thinking starts the moment your measurement doesn't match expectations. Did I measure correctly? Is her bladder full? Is the baby in an odd position? By taking that extra minute to re-measure, you're not just being thorough—you're protecting your patient from unnecessary worry and testing. In prenatal nursing, we are the first-line detectors of potential problems. Mastering this simple skill and knowing what to do with the information is what makes you an invaluable member of the care team. On the NCLEX, they want to see that you know the norm (24 cm at 24 weeks) and that your first instinct is to ensure your data is accurate before acting."