HealthTap Online Primary Care Doctors Accepting New Patients
Book a video visit
HealthTap
Telehealth
A member asked:

Is down syndrome always caused by a defect in the 21 chromosome?

A doctor has provided 1 answer
Dr. Nikolaos Zacharias answered

Specializes in Maternal-Fetal Medicine

Extra chromosome 21.: Either complete or partial trisomy for chromosome 21 is always responsible for down syndrome.

Dr Ferguson and 3 doctors agreed

Answered 9/22/2016

5.7k views

Thank

Related Questions

A member asked:

Does measuring small during first US appt (being 1 week off - measured 6W2D, should be 7W2D) indicate issues down the line (i.e. increased risk for Down Syndrome or other chromosomal abnormalities, etc.)?

A doctor has provided 1 answer

A member asked:

I am currently pregnant after multiple miscarriages. I tested my HCG at 5 Weeks 3 Days pregnant and it was 16,557. Is this an indication of a possible chromosomal abnormality, such as Down Syndrome?

A doctor has provided 1 answer

A member asked:

What are the chances my child will be born with chromosomal abnormalities? I was told my unborn child has echogenic bowels, that i tested higher for the risk of Down syndrome and as a carrier of the cystic fibrosis trait

A doctor has provided 1 answer

A member asked:

How many chromosome defects cause retardation?

A doctor has provided 1 answer

A member asked:

Are birth defects in amish caused by a mutation or a chromosonal abnormality?

A doctor has provided 1 answer

Sponsored Content
HealthTap Medical Group does not endorse products or services. Sponsored content revenues support our mission to make health information free and accessible to all.Learn more

People also searched for:

Which type of chromosomal mutation causes down syndrome?
What is the reasons that lead to inversion duplication in chromosome 21 that lead to down syndrome?
Can chromosomal microarray detect down syndrome? What's the difference between chromosomal microarray and the conventional karyotypying?
I'm doing a science project on down syndrome and my teacher wants to know dominate recessive or chromosomal (how common) can you help?
What kind of chromosomal mutation causes the cri du chat syndrome?

Telemedicine

Primary Care
Manage Your Conditions
Women's Health
Children's Health
Men's Health
Senior Health
Wellness, Prevention & Lifestyle
Sexual Health
Mental & Behavioral Health
Travel Medicine
Urgent Care
Ask your question
Didn't find what you're looking for?

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.

Ask your question

More of what we treat

Allergies
Antibiotics
Asthma
High Blood Pressure
Prescriptions
Type 2 Diabetes
Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.
HealthTap
HIPAA logo
HIPAASecure
Soc 2 Type 2 logo
SOC 2 Type 2Certified
JCAHO Accredited
JCAHOAccredited
Member App

Download HealthTap

Video visit and message your doctor

Member App QR Code
Play Store Member LinkApp Store Member Link

Questions?

+1 (888) 828-0841support@healthtap.com
LinkedInTwitter
HomeTermsPrivacyCookiesDMCAHealth TopicsDoctors DirectoryDoctor Q&A by Specialty
Copyright 2026 HealthTap, Inc.