Medical Questions > Pregnancy Forum > Second Trimester of Pregnancy Forum

concerned about the s/d ratio, or is this a normal value?

User Profile
Good morning,

I am currently 25 weeks pregnant and seeing a high-risk perinatologist because of a 20 week stillbirth (causes unknown) in December. I have been suffering a lot of anxiety during this pregnancy, and specifically asked for a doppler study to be done. The doctor measured my uterine artery flow--the s/d ratio was 4.6 at 24 weeks 6 days. She said that was normal, but later while reading some articles on the internet, it seems like a high value that is concerning to me. I do not have high blood pressure, nor do I have an IUGR baby (baby is measuring at 60th percentile). I had a subchorionic hematoma diagnosed at 8 weeks and bled and spotted from them until week 17 (have not bled or spotted for 8 weeks). I don't have any other risk factors except I am compound heterozygous MTHFR. I have a two-year-old daughter at home.

My question is: am I right to be concerned about the s/d ratio, or is that a normal value for 24/25 weeks and I am just being hypervigilant?

Did you find this post helpful?

User Profile
replied October 29th, 2011
Second Trimester of Pregnancy Answer A28016
Welcome to the ehealthforum and I am glad to help you out.

At 20 weeks gestation a few weeks after the normal S/D ratio range for umbilical artery is 3.84-5.6 and for uterine artery is range = 1.92-2.36. So if the S/D ratio is within these limits, it is within normal range. For exact confirmation, you may need a repeat color doppler at 28 weeks gestation.

It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care.

Did you find this post helpful?
This question has been answered by the doctor. This topic is now open for public discussion, however no comments below this point will be answered by a doctor.
Must Read
What happens during labor? What do contractions feel like? And how do I know that labor has begun? Read on to learn about birthing basics....
Signs of labor occur after 36 weeks of pregnancy. Learn about the difference between real and false contractions. Plus, we outline signs of delivery complicati...
Almost all women worry about the pain of childbirth. Preparing for childbirth includes thinking about how you'd like to cope with the pain of labor. Read on for...
DISCLAIMER: "Ask a Doctor" questions are answered by certified physicians and other medical professionals. For more information about experts participating in the "Ask a Doctor" Network, please visit our medical experts page. You may also visit our Second Trimester of Pregnancy , for moderated patient to patient support and information.

The information provided on eHealth Forum is designed to improve, not replace, the relationship between a patient and his/her own physician. Personal consultation(s) with a qualified medical professional is the proper means for diagnosing any medical condition.