HomeAnswersFetal Medicinehypoplasia of nasal bone

I am 23 weeks. Does a 3.6 mm fetal nasal bone mean Down's?

This Premium Q&A, reviewed and published, features a real conversation between an iCliniq user and a physician.

Patient's Query

Hi doctor,

My quadruple test is normal. After 23 weeks of gestation, I took an anomaly scan, which shows 3.6 mm nasal bone. Is the nasal bone underdeveloped? What are the chances of Down's syndrome?

We do not want to get an amniocentesis test done as it increases the chance of miscarriage. Previously, I had a miscarriage as the fetus did not have a heartbeat.

Is there any other way to diagnose Down's syndrome?

Please help.
Answered by Dr. Sameer Kumar

Education:

MBBS

Professional Bio:

Dr. Sameer Kumar is a highly qualified Obstetrician and Gynecologist and Infertility specialist with more than two decades of clinical experience. He has completed his postgraduate training in Obstetrics and Gynecology and also specializes in infertility management. Dr. Kumar is dedicated to women’s health, offering expert care in pregnancy, reproductive health, and fertility treatments. His patient-centered approach combines medical expertise with compassionate support to ensure the best outcomes for his patients. Note: If you don't want go opt for IVF and spend lakhs, then you must contact me as i specialize in medical infertility treatment for both male and female. Results have been really encouraging and statistics speak for itself, about 2000 couples helped and avoided IVF.

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Hi,

Welcome to icliniq.com.

The nasal bone thickness is relevant only between 11 to 13 weeks pregnant scan where it should be less than 0.08 inches. Nasal bone thickness at 23 weeks gestation is irrelevant. If the quadruple test shows low risk of Down's syndrome, then amniocentesis (a test used to detect fetal abnormalities) is not recommended.

However, the only way to check Down's syndrome can be amniocentesis or CMA (chromosomal microarray) where fetal cells are separated from the mother and karyotyping is done.

I hope this answers your query.

Thank you and take care.

Patient's Query

Thank you doctor,

The nasal bone length is 0.13 inches and it is not the thickness. Can this alone be indicative of Down's syndrome?

Please help.

Answered by Dr. Sameer Kumar

Education:

MBBS

Professional Bio:

Dr. Sameer Kumar is a highly qualified Obstetrician and Gynecologist and Infertility specialist with more than two decades of clinical experience. He has completed his postgraduate training in Obstetrics and Gynecology and also specializes in infertility management. Dr. Kumar is dedicated to women’s health, offering expert care in pregnancy, reproductive health, and fertility treatments. His patient-centered approach combines medical expertise with compassionate support to ensure the best outcomes for his patients. Note: If you don't want go opt for IVF and spend lakhs, then you must contact me as i specialize in medical infertility treatment for both male and female. Results have been really encouraging and statistics speak for itself, about 2000 couples helped and avoided IVF.

This doctor is not available for online consultations on the platform anymore.

Consult other doctors in the same speciality

Hi,

Welcome back to icliniq.com.

The nasal bone length is not a soft tissue marker of Down's syndrome. It is the thickness, which is important. As the other markers and the nasal bone length are normal, the chances of Down's syndrome are negligible.

The quadruple marker graph(attachment removed to protect patient identity) is well below cut off, so unlikely that the child is Down's syndrome.

I suggest you take rest for a few days.

Thank you and take care.

Medically reviewed by Dr. K. Shobana
Published At September 7, 2016
Reviewed At October 8, 2025

Education:

MBBS

Professional Bio:

Dr. Sameer Kumar is a highly qualified Obstetrician and Gynecologist and Infertility specialist with more than two decades of clinical experience. He has completed his postgraduate training in Obstetrics and Gynecology and also specializes in infertility management. Dr. Kumar is dedicated to women’s health, offering expert care in pregnancy, reproductive health, and fertility treatments. His patient-centered approach combines medical expertise with compassionate support to ensure the best outcomes for his patients. Note: If you don't want go opt for IVF and spend lakhs, then you must contact me as i specialize in medical infertility treatment for both male and female. Results have been really encouraging and statistics speak for itself, about 2000 couples helped and avoided IVF.

This doctor is not available for online consultations on the platform anymore.

Consult other doctors in the same speciality

Education:

BDS

Professional Bio:

Dr. K. Shobana is a Dental Surgeon specializing in oral health and dental care. She is skilled in preventive dentistry and provides oral hygiene education. She can do restorative treatments such as fillings and crowns. She can handle periodontal problems such as gum diseases and periodontitis. She can do root canal treatment.

This doctor is not available for online consultations on the platform anymore.

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Decision Helper
Fetal Nasal Bone and Down's Syndrome Decision Helper

Concerned about fetal nasal bone measurements?

This tool helps you understand the relevance of fetal nasal bone measurements in relation to Down's syndrome risk. It provides guidance for discussing your concerns with a healthcare professional.

For guidance only, not a diagnosis. Always consult a healthcare professional for personalized medical advice.
Dr. Sameer Kumar
Dr. Sameer Kumar

Obstetrics and Gynecology

Consult this doctor

Education:

MBBS

Professional Bio:

Dr. Sameer Kumar is a highly qualified Obstetrician and Gynecologist and Infertility specialist with more than two decades of clinical experience. He has completed his postgraduate training in Obstetrics and Gynecology and also specializes in infertility management. Dr. Kumar is dedicated to women’s health, offering expert care in pregnancy, reproductive health, and fertility treatments. His patient-centered approach combines medical expertise with compassionate support to ensure the best outcomes for his patients. Note: If you don't want go opt for IVF and spend lakhs, then you must contact me as i specialize in medical infertility treatment for both male and female. Results have been really encouraging and statistics speak for itself, about 2000 couples helped and avoided IVF.

This doctor is not available for online consultations on the platform anymore.

Consult other doctors in the same speciality
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