A nurse is reviewing ultrasound findings for a pregnant client at 20 weeks gestation. Which assessment finding would be most concerning and require immediate further evaluation?
1Fetal heart rate of 150 beats per minute
2Estimated fetal weight at the 25th percentile for gestational age
3Absence of fetal movement felt by the mother (quickening)✓ 정답
4Biparietal diameter measuring 4.5 cm
해설
Absence of quickening at 20 weeks is concerning as it may indicate fetal compromise, requiring immediate evaluation. Other findings (FHR 150 bpm, EFW 25th percentile, BPD 4.5 cm) are within normal limits.
Core Nursing ExplanationKey Concept Analysis: This question assesses your ability to identify a critical abnormal finding in a routine prenatal ultrasound at 20 weeks gestation. The focus is on differentiating normal variations from signs of potential fetal compromise. At 20 weeks, the mother should be consistently feeling fetal movements (quickening). The absence of this is a Key Point! subjective but significant indicator that requires urgent assessment to rule out fetal distress or demise.
Answer Rationale: Key Point!Quickening (the mother's perception of fetal movement) typically begins between 16-20 weeks for a first pregnancy and may be felt earlier in subsequent pregnancies. By 20 weeks, the absence of perceived movement is a red flag. While an ultrasound can confirm fetal cardiac activity, the mother's report of no movement is a primary, concerning symptom that must be investigated immediately to assess fetal well-being. This aligns with the nursing priority of early detection of potential problems.
Distractor Analysis:
Watch out for confusion! Option ①: A fetal heart rate (FHR) of 150 beats per minute is within the normal range of 110-160 bpm. This is a reassuring finding.
Option ②: An estimated fetal weight (EFW) at the 25th percentile is within normal limits. Fetal growth is considered normal between the 10th and 90th percentiles. This indicates a smaller but healthy fetus, not necessarily a growth-restricted one.
Option ④: A biparietal diameter (BPD) of 4.5 cm is appropriate for 20 weeks gestation. The BPD is a standard measurement for dating a pregnancy, and this value is consistent with the gestational age.
Related Concepts: This scenario integrates knowledge of normal prenatal development, maternal assessment, and the use of diagnostic tools. The nurse's role involves patient education about fetal movement counts later in pregnancy and knowing when to escalate concerns based on maternal report, not just objective test data.
Concept Summary
Concept
Description
Nursing Implication
Quickening
Mother's first perception of fetal movement (16-20 wks).
Absence by 20 wks is a concerning finding requiring evaluation.
Fetal Heart Rate (FHR)
Normal range: 110-160 bpm.
A baseline for assessing fetal well-being. 150 bpm is normal.
Estimated Fetal Weight (EFW)
Calculated via ultrasound measurements.
Percentiles (10th-90th) are normal. Below 10th may indicate IUGR.
Biparietal Diameter (BPD)
Measurement of fetal head width.
Used for gestational age dating. 4.5 cm is normal for 20 wks.
Side-by-Side Comparison!
Finding
Normal at 20 Weeks
Concerning at 20 Weeks
Rationale
Fetal Movement (Quickening)
Consistently felt by mother
Absent
Primary indicator of fetal well-being from maternal perspective.
Fetal Heart Rate
110-160 bpm
>160 bpm (Tachycardia) or <110 bpm (Bradycardia)
Objective sign of potential distress; 150 bpm is normal.
Fetal Size/Growth
EFW between 10th-90th percentile
EFW <10th percentile (IUGR suspect)
25th percentile is within normal growth variation.
Anatomy, Physiology & Pharmacology Points
Physiology: Fetal movements are a sign of neuromuscular development and well-being. Decreased or absent movement can signal fetal hypoxia, as the fetus conserves energy and oxygen.
Assessment: The Biophysical Profile (BPP) is a later-term ultrasound assessment that includes fetal movement, tone, breathing, amniotic fluid volume, and FHR reactivity to evaluate well-being.
Memory Tips
Quickening Timeline: Think "16-20" for first-time moms. "No movement by 20, time to verify!"
FHR Normal Range: Memorize as "110 to 160, keeps the baby thriving."
Growth Percentiles: Healthy growth is between the 10th (the floor) and 90th (the ceiling) percentiles.
High-Frequency NCLEX Topics
This question tests prioritization and assessment of normal vs. abnormal findings in maternity nursing. The NCLEX loves to present multiple normal data points with one subtle abnormality that requires nursing action. Always ask yourself: "Which finding represents a change from the expected norm that could indicate harm to the mother or fetus?"
Watch Out for Question Variations!
Instead of "most concerning finding," the question could ask: "The nurse should report which finding to the provider immediately?" The answer remains the same.
The scenario could shift to a later gestation (e.g., 28 weeks) and ask about fetal movement counts (kick counts). The concerning finding would then be "Less than 10 movements in 2 hours."
They could provide an ultrasound finding like oligohydramnios (low amniotic fluid) or placenta previa, which would also be high-priority concerns.
Nursing Clinical Practice GuideClinical Scenario: You are a nurse in a prenatal clinic. Maria, a 22-year-old G1P0 at 20 weeks gestation, is here for her routine anatomy scan. She mentions to you, "You know, I still haven't felt the baby move. Is that normal?" The ultrasound technician has just given you the preliminary report showing a normal FHR, BPD, and EFW.
Nursing Intervention Strategy:
Assessment: First, validate the client's concern. Acknowledge her statement: "Thank you for telling me that. It's important information." Immediately assess the ultrasound report for fetal cardiac activity and confirm it is present. Even with a normal FHR on the report, the mother's report of absent quickening requires action.
Planning & Implementation: Your immediate plan is to notify the obstetric provider (MD/CNM) of the patient's report. Do not dismiss it because the ultrasound numbers look good. The provider will likely want to speak with the patient and may perform a Doppler assessment in the office for immediate reassurance or order additional monitoring.
Patient Education & Support: While waiting, educate the client. "It's common to feel movement inconsistently at first, but by 20 weeks, we usually expect you to feel something. The ultrasound shows a good heartbeat, which is very reassuring. The doctor/midwife will want to discuss this with you to make sure everything is okay." Provide emotional support to alleviate anxiety.
Evaluation: The desired outcome is confirmation of fetal well-being through provider assessment. Your intervention is successful when the concern is appropriately escalated and evaluated.
Patient Safety and Precautions: Never ignore a pregnant patient's report of decreased or absent fetal movement, regardless of gestational age after quickening should have begun. This is a patient-centered safety priority. Relying solely on a recent normal test result can lead to missed warning signs.
Nursing Procedure & Medication Flow
While this scenario doesn't involve a specific medication, the procedure is communication and escalation:
1. Gather data (maternal report + objective findings).
2. Analyze: Is there a discrepancy? (Yes—normal scan vs. absent movement).
3. Act: Inform the provider promptly with all relevant information.
4. Document: "Client verbalized absence of perceived fetal movement (quickening) at 20w0d gestation. Ultrasound report reviewed showing FHR 150 bpm, EFW 25%, BPD 4.5 cm. Provider Dr. X notified at [time]. Client awaiting further evaluation."
A Word from Your Senior Nurse
"In maternity nursing, the mother is our most sensitive monitor. She knows her body and her baby. A textbook-normal ultrasound is fantastic, but if the mom says something doesn't feel right, you listen. Your critical thinking bridges the gap between objective data and subjective experience. Passing this question on the NCLEX means you understand that principle. In real life, acting on it can make all the difference. Always advocate for your patient's concerns—it's the heart of nursing."
Quickening — The first perception of fetal movement by the pregnant woman, typically occurring between 16-20 weeks of gestation.
Fetal Heart Rate — The heart rate of the fetus. The normal baseline range is 110-160 beats per minute.
Estimated Fetal Weight — A calculation of the approximate weight of the fetus based on ultrasound measurements. Often reported as a percentile for gestational age.
Biparietal Diameter — A measurement of the diameter of the fetal head between the two parietal bones. Used to estimate gestational age and monitor fetal growth.
Fetal Compromise — A general term indicating that the fetus is not receiving adequate oxygen or nutrients, potentially leading to distress or harm.