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Hello Doctor,
My regular gynaecologist is currently out of station. I am 36 weeks and 1 day pregnant and have had one previous C-section. I am hoping for a VBAC.
My latest ultrasound report shows:
Fetal heart rate: 175 bpm
BPP: 8/8
Estimated fetal weight: 2.8 kg
AFI: 12 cm
Fetal position: Cephalic (head down)
Previous C-section scar thickness: 5 mm
Could you please review the attached ultrasound report and advise whether the fetal heart rate is concerning and whether VBAC would be a suitable option in my case?
Thank you, Doctor.
Answers (3)
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Your ultrasound findings are generally reassuring. The baby is in cephalic (head-down) presentation, estimated fetal weight is 2.8 kg, AFI is 12 cm (normal), and BPP is 8/8, indicating good fetal wellbeing at the time of the scan.
However, fetal heart rate of 175 bpm is higher than the normal baseline range (110–160 bpm). It may be transient, but persistent fetal tachycardia needs evaluation. I would recommend an immediate CTG/NST to assess the fetal heart rate pattern, along with checking maternal temperature, hydration and other possible causes of tachycardia. Please contact your obstetrician or visit the labour room today rather than waiting for your next appointment.
Next Steps
A lower uterine segment scar thickness of 5 mm is relatively reassuring, but scar thickness alone cannot reliably predict uterine rupture or determine VBAC eligibility.
If you are suitable for VBAC, labour should be attempted in a hospital with continuous fetal monitoring and immediate access to emergency C-section facilities.
Health Tips
My advice: First get the fetal heart rate of 175 bpm evaluated with CTG. Once fetal wellbeing is confirmed and your previous C-section details are reviewed, your obstetrician can help decide whether VBAC is a safe option. Do not delay assessment if you notice reduced fetal movements, bleeding, leaking or abdominal pain.
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A single previous caesarean with a scar thickness of 5 mm, good liquor, and a biophysical profile of 8 out of 8 are all encouraging signs for attempting a VBAC. The fetal heart rate of 175 bpm is the one figure worth a closer look, since 110 to 160 bpm is the usual range for this stage.
Next Steps
An obstetrician should see you in person soon, ideally today, to recheck the heart rate and rule out fever or dehydration as a cause. The final call on VBAC also needs your pelvis, your scar healing and the hospital's backup plan weighed together, which only an in-person review can settle.
Health Tips
Seek emergency care if movements reduce, you develop fever, bleeding or contractions start.
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