The report came back with a row of abbreviations. PI. RI. S/D. Three decimal numbers beside them, a line at the bottom you have read four times, and an appointment with your doctor that isn’t until Thursday.
If you have reached this page from that report, start here: a colour doppler in pregnancy is most often a monitoring scan, not a verdict. Doctors order it to check something carefully, and in a large number of cases it comes back reassuring.
Below is what the scan actually looks at, the reasons it gets prescribed, and — the part almost no one explains — how to make sense of the numbers without frightening yourself before Thursday.
What a Colour Doppler Scan Measures?
A routine ultrasound looks at structure. It measures how big your baby is, checks the organs, counts the fingers.
A Doppler does something different. It measures movement specifically, the speed and direction of blood flowing through vessels. The colours you see on the screen are not the baby’s anatomy; they simply show blood travelling towards the probe or away from it.
So while a growth scan tells your doctor how big your baby is, a Doppler tells them how well the placenta is delivering oxygen and nutrients to make that growth possible. Size and supply are two different questions, and this scan answers the second one.
Why Your Doctor Ordered This Scan?
A doppler test for baby growth and wellbeing is usually added for one of these reasons:
- Your baby measured smaller than expected on the growth scan
- You have high blood pressure, or preeclampsia is suspected
- You have gestational diabetes
- You’ve noticed reduced fetal movements
- You’re carrying twins
- A previous pregnancy involved a small baby, growth restriction or loss
- Your scan showed low amniotic fluid
- You’ve passed your due date
Notice that most of these are reasons to watch, not reasons to worry. Being sent for a Doppler means your doctor wants information before making any decision — which is exactly what good antenatal care looks like.
Which Blood Vessels Are Checked?
- Umbilical artery — the main one. An umbilical artery doppler shows how much resistance the placenta is putting up against blood flow.
- Middle cerebral artery (MCA) — blood flow to the baby’s brain, which changes in a specific way when the baby is conserving oxygen.
- Uterine arteries — your own blood supply into the placenta, usually assessed earlier in pregnancy.
- Ductus venosus — added only in specific situations, when closer assessment is needed.
Understanding PI, RI and S/D on Your Report:
This is the part that sends most women searching at midnight. Here is the plain version.
What Each Index Measures?
What "Normal", "Raised" and "Absent Flow" Mean?
Reports generally fall into three broad situations.
- Normal flow – The placenta is supplying the baby comfortably. Usually no change to your plan beyond routine follow-up.
- Raised resistance – The placenta is working harder than expected. This rarely calls for immediate action, but it does mean closer watching — typically a repeat scan in days rather than weeks, along with growth monitoring.
- Absent or reversed end-diastolic flow – This is the phrase that alarms people most, so it deserves a clear answer. Absent end-diastolic flow means blood flow in the umbilical artery pauses between heartbeats rather than continuing steadily. It is a significant finding and it is taken seriously — but it is also precisely the finding this scan exists to catch, and it is acted on rather than watched from a distance.
What Happens If the Doppler Is Abnormal?
An abnormal result changes the monitoring plan, not usually the outcome. Depending on the finding and how many weeks you are, your doctor may:
- Repeat the Doppler in a few days instead of a few weeks
- Add more frequent growth scans and fluid checks
- Give steroid injections to mature the baby’s lungs, in case earlier delivery becomes the safer choice
- Plan the timing and method of delivery in advance rather than waiting
Most pregnancies with abnormal Doppler findings are monitored closely and delivered safely. The scan’s purpose is to give your team time to plan — and it does that job well.
How the Radiologist Reads It?
Dr. Sagar Sunjanyal assesses the shape of the waveform, not only the numbers printed beside it. The pattern of flow across each heartbeat carries information no single index captures.
This is also why the impression line at the bottom of your report matters more than the values above it. That line is the conclusion. The numbers are the working.
Colour Doppler Scans in Pimpri Chinchwad:
Pearl Diagnostics performs colour Doppler studies with an on-site radiologist and same-day reporting, so you are not left holding an unexplained report over a weekend. If you’d like to confirm timing or the cost of a doppler scan in PCMC, our team can tell you before you come in — and the complete pregnancy scan schedule will show you how this scan fits alongside the rest.
Have a Doppler report you'd like explained?
Bring it in. Pearl Diagnostics offers colour Doppler studies with an on-site consultant radiologist and same-day reports at our Pimpri Chinchwad centre.
📞 Book an appointment Colour Doppler test in Pimpri Chinchwad
Frequently Asked Questions:
Yes. It uses the same sound-wave technology as a routine ultrasound, with no radiation involved. Dr. Sagar Sunjanyal notes that Doppler studies are performed for the shortest time needed, in line with standard fetal imaging practice.
Not usually. Most abnormal results mean closer monitoring, not immediate delivery. The scan is designed to detect changes early, which is what allows your doctor to plan calmly rather than react.
It depends on the reason it was ordered and the result. A normal result may need no repeat; raised resistance often means a repeat within a week. Your obstetrician sets the interval based on your full picture.
A growth scan measures your baby’s size and weight. A Doppler measures blood flow through the placenta and cord. Dr. Sagar Sunjanyal often performs both together, because size and supply answer different questions about the same pregnancy.
