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What Causes Less Gestational Age Of Fetus On Pregnancy Scan?

Hello, I am 27 yrs old from orissa, India. This is my first pregnancy. Before pregnancy i had delayed periods from 2 to 3 weeks to sometimes one month. after marriage it was regular but sometime it delayed 10-15 days. so my LMP is 14th july 2010. On december my doctor told that there is some extra liquor and asked me to do TIFFA scan(Targeted Imaging For Fetal Anomalies). So report was normal. Radiologist said fetus GA is 27 weeks 4 days, but according to LMP it should be 29 weeks. i havent met my doctor till now. will vist next week. but rest every thing is normal. baby is ok in the report, its growth is not according to the LMP. i could feel its flutters and movements. Is everything ok? I am a bit nervous.
Tue, 27 Oct 2015
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OBGYN, Maternal and Fetal Medicine,  's  Response
Hi dear, I have gone through your question and understand your concerns.
Irregular periods can lead to delayed ovulation, hence delayed conception and in this scenario, the gestation age by LMP do not corresponds with that by the ultrasound.
If all the parameters of the fetus are normal, and there is no congenital anomalies, then there is absolutely nothing to worry.
You can get a Doppler ultrasound to confirm whether the blood supply to the fetus is normal, as decreased blood supply can lead to decreased growth of the fetus.
Hop you found the answer helpful.
Wishing you good health.
Dr Deepti Verma
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What Causes Less Gestational Age Of Fetus On Pregnancy Scan?

Hi dear, I have gone through your question and understand your concerns. Irregular periods can lead to delayed ovulation, hence delayed conception and in this scenario, the gestation age by LMP do not corresponds with that by the ultrasound. If all the parameters of the fetus are normal, and there is no congenital anomalies, then there is absolutely nothing to worry. You can get a Doppler ultrasound to confirm whether the blood supply to the fetus is normal, as decreased blood supply can lead to decreased growth of the fetus. Hop you found the answer helpful. Wishing you good health. Dr Deepti Verma