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Interpretation of this report
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ACOG ultrasound estimated fetal weight third trimester amniotic fluid index fetal surveillance
Summary
This is a reassuring third-trimester obstetric ultrasound showing a single live baby with normal activity and fluid.
| Finding | Reported value | Meaning |
|---|---|---|
| Pregnancy | Single, live, intrauterine fetus | One viable baby in the uterus |
| Position | Vertex | Head-down, a favorable position for a possible vaginal birth |
| Fetal heart rate | 143 bpm | Normal fetal heart rate range is roughly 110-160 bpm |
| Fetal movements | Present | Reassuring |
| Amniotic fluid index (AFI) | 15.94 cm | Adequate/normal fluid. Low fluid is generally AFI <5 cm. |
| Estimated fetal weight | 3,086 g ±457 g | About 3.1 kg, but ultrasound weight has a meaningful margin of error |
| Estimated weight percentile | 88.84th percentile | Baby is larger than average, but below the usual 90th-percentile cutoff often used to label “large for gestational age” |
| Placenta | Posterior, not low lying | Placenta is on the back wall of the uterus and not covering/near the cervix |
| Cervix/internal os | Internal os closed; cervical length noted about 3.7 cm | No obvious ultrasound evidence of cervical opening |
| Impression | “A single live foetus, grossly normal” | No major abnormality was identified on this scan |
Pregnancy dates and growth
- By the last menstrual period, the scan lists 35 weeks 2 days, with due date 23 November 2026.
- By the baby’s ultrasound measurements, gestational age is 37 weeks 3 days, with due date 8 November 2026.
- Thus, the baby is measuring approximately 2 weeks ahead of the date calculated from the menstrual period.
Individual measurements are also relatively high:
- Abdominal circumference: around the 90th percentile
- Overall estimated weight: about the 89th percentile
- Head measurement and femur length: within expected ranges
This may simply reflect a constitutionally bigger baby or uncertainty in menstrual dating. However, the obstetrician should compare this with the earliest dating scan, because first-trimester dating is generally more reliable than late-pregnancy size measurements. A late scan should not by itself change the due date.
What to discuss with the obstetrician
- Was an early dating scan done? Use that scan to confirm the final due date.
- Has gestational diabetes screening been normal? A baby measuring on the larger side can be one reason to ensure glucose testing has been reviewed.
- Follow-up growth scan or delivery planning: This depends on maternal health, blood glucose, blood pressure, prior obstetric history, and the clinician’s examination. Ultrasound estimated fetal weight is an estimate, not an exact weight. ISUOG notes that Hadlock formulas are standard for estimating fetal weight in third-trimester ultrasound. ISUOG guidance
Seek urgent maternity assessment if
- baby movements are noticeably reduced,
- vaginal bleeding,
- leaking fluid,
- regular painful contractions,
- severe headache, visual disturbance, severe upper abdominal pain, sudden swelling, or high blood pressure symptoms.
Overall: the scan is reassuring, with normal heartbeat, normal fluid, head-down position, and no major abnormality noted. The main point is that the baby measures somewhat ahead of the LMP-based dates and is on the larger side, so this should be reviewed with the obstetrician alongside the early dating scan and diabetes screening results.
Did you see the cord around neck?
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nuchal cord single loop ultrasound clinical significance patient information
Yes. The handwritten note at the bottom appears to say “cord around neck - single loop.” This is called a single nuchal cord.
The printed report does not indicate fetal distress:
- Heart rate: 143 bpm, normal
- Fetal movements: present
- Amniotic fluid: adequate
- Overall impression: single live fetus, grossly normal
A single loop around the neck is common and is usually not harmful. It can also change or come off with fetal movement. The important thing is ongoing fetal movement and monitoring during labor, rather than the loop alone. As the scan otherwise looks reassuring, contact the obstetrician for the planned follow-up, and seek maternity assessment promptly if movements become reduced, there is bleeding, fluid leakage, or painful regular contractions.
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