HealthCareMagic is now Ask A Doctor - 24x7 | https://www.askadoctor24x7.com

Get your health question answered instantly from our pool of 18000+ doctors from over 80 specialties
159 Doctors Online

By proceeding, I accept the Terms and Conditions

Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

HCM Blog Instant Access to Doctors
HCM BlogQuestions Answered
HCM Blog Satisfaction

How Is A Pregnancy Due Date Calculated?

I just did my first ultrasound today. I thought that the baby was 8 weeks based on my lmp and the ultrasound age is 5 and a half weeks. The clinic took my blood to look at my hcg but didn t explain anything to me. I don t know what to think. is this a missed miscarriage? was the time wrong? how could it be that different? i know that i conceived the child 5 weeks ago and i was positive on the pregnancy test 3 weeks ago. the math doesn t make sense to me. can you help please?
Fri, 19 Feb 2021
Report Abuse
General & Family Physician,  's  Response
Hello,

The age of the baby calculated by ultrasound is the most accurate. Dating based on the LMP is an approximation based on the time of your last period. The due date is calculated by adding 9 months and 7 days from your LMP. However, the most accurate method is based on your Ultrasound. I do not think you have any need to worry at this point. The 5 and a half weeks is an accurate estimate to go by.

Take care. Hope I have answered your question. Let me know if I can assist you further.

Regards,
Dr. Pranav Balakrishnan, General & Family Physician
I find this answer helpful
Note: For further follow up on related General & Family Physician Click here.
Disclaimer: These answers are for your information only and not intended to replace your relationship with your treating physician.
This is a short, free answer. For a more detailed, immediate answer, try our premium service [Sample answer]
Share on
 

Related questions you may be interested in


Loading Online Doctors....
How Is A Pregnancy Due Date Calculated?

Hello, The age of the baby calculated by ultrasound is the most accurate. Dating based on the LMP is an approximation based on the time of your last period. The due date is calculated by adding 9 months and 7 days from your LMP. However, the most accurate method is based on your Ultrasound. I do not think you have any need to worry at this point. The 5 and a half weeks is an accurate estimate to go by. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Pranav Balakrishnan, General & Family Physician