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Yes, if you have a long cycle they can differ. In my first pregnancy my last period was December 17th which made my due date 23rd September. My ultrasound (at 18 weeks) gave a date of October 4th. I had a 36 day cycle. 3 years later my cycle was 28 days and my ultrasound was spot on. An early ultrasound, around 6-7 weeks is extremely accurate. The later in pregnancy it is done the greater the variation as babies are all different sizes.

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โˆ™ 2005-11-07 14:23:43
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Q: Can the calculation done from an ultrasound report and the one made from your last menstrual period differ as much as 1 week?
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Related questions

If you have a period can you still have an transvaginal ultrasound?

Yes, I was on my menstrual cycle. I informed the tech and he said that it could still be done.

Your menstrual period stopped 3 mths due ovarian cyst. can hormone pills help?

your menstrual period stopped 3 mths. after ultrasound scan found 3cm ovarian cyst. Gynaecologist pescribed hormone pills.can it work

Do birds have menstrual period?

No, Birds have no menstrual period...

If you are five days late for your period and a pregnancy test is positive how far along are you?

Doctors determine how far along you are by the first day of your last menstrual period. If you can remember the first day of your last menstrual period, then start to count from then to now. If you don't remember the first day of your last menstrual period, then you should get an ultrasound done and they will tell you. It's good to get ultrasounds done early in your pregnancy.

What is the First menstrual period known as?

The first menstrual period is known as "menarche".

When does mother missed menstrual period?

mothers miss menstrual period when she is pregnant.

What is the abbreviation for the last menstrual period?


Can your last menstrual period show twenty three weeks but your ultrasound show twenty seven weeks which is more accurate?

ultrasound is more accurate. Measurments of the fetus are made during ultasound that give a more accurate gestational age

How does girl differ physically from a boy during puberty?

A girl gets her period (menstrual cycle) and boys get lots of underarm hair

How do you calculate menstrual date?

Menstrual cycles aren't a calculation, it's really just as simple as counting from the first day of your period up until the next period. You figure out the average over your last six cycles - anything up to a weeks variation from your average menstrual cycle is considered normal - but cycles can change, it's sometimes easier to use a menstrual tracking app on your phone to keep track for you.

Do chocoloates delay menstrual period?

No chocolates do not delay your menstrual period or have any impact on your menstrual cycle. Your menstrual cycle is controlled by hormonal changes, not by what you eat.

What is the period in the menstrual cycle in which the unfertilized egg and the lining of the uterus leave the body in the menstrual flow?

You've sort of answered this question twice in the question itself! "The PERIOD in the MENSTRUAL cycle which the MENSTRUAL" The menstrual phase aka menstruation or period.

What is a period that girls have?

Menstrual Period

Why your period started on 34th day from your last cycle?

The average menstrual cycle is 28 days - but everyone is different, for some women their menstrual cycles may be 34 days, it is also normal for menstrual cycles to differ by up to a week from each other.

Can fish have menstrual period?

Fishes do not have menstrual period. The whales and dolphins are mammals. But they also do not have menstruation.

When is the mid-cycle of a menstrual period?

Menstrual period refers to menstruation or your period, which is the start of your menstrual cycle. If you're referring to mid-cycle then midway through the menstrual cycle is typically when a woman would ovulate.

How come your period comes whenever?

Your period doesn't come 'whenever' - when your period is due depends on your menstrual cycle, typically this is 28 days but it can differ from person to person and irregular cycles can be normal during your teens.

If you are 11 weeks pregnant on Dec 30 2009 when did you conceive?

Nine weeks before that, which is the same as two weeks after your last menstrual period. Doctors include the two weeks before conception in their calculation of the pregnancy date; that is, they start the calculation from the first day of your last period. Approximately 10/31/09.

Can you swim while on your menstrual?

Yes, you can swim on your period or do anything else you want on your period.You do however need to use internal menstrual products to swim on your period:TamponsSoft tamponsMenstrual spongesSoftcupsDiaphragmsMenstrual cups

Can you swin on your period?

Yes, you can swim on your period or do anything else you like on your period.To swim on your period you need to use one of the following menstrual products:TamponsSoft tamponsMenstrual spongesMenstrual cupsDiaphragmsSoftcups

What is a girl's MC period?

It is their menstrual cycle period.

When can spina bifida be diagnosed?

A early time to find spina bifida is during a detailed prenatal ultrasound scan, especially between 16 and 20 weeks gestation (from the last menstrual period).

Can you start your period if you eat cinnamon?

No, when you start your period is determined by your menstrual cycle - cinnamon does not and cannot effect your menstrual cycle. Your period comes when it is due.

How can you calculate when your next menstrual period is due?

It's not calculation, it's simply counting from day one of your last period up until your next period - depending on your average menstrual cycle length. You can also simply pay attention to your body, your body changes throughout your cycles so learning to recognise how it changes will tell you when your period is due even if your periods are irregular - learn to use fertility awareness method.

Puede el metronidazol retrasar el periodo menstrual?

Are you on your menstrual period?