Reliability of ultrasound dating Free hot webcam chatting no register
Ultrasounds performed after 22 weeks gestation cannot be used to estimate the due date of the baby because the size no longer reflects the age very well.Even average babies can differ by up to 2 to 3 "weeks of growth";.These scans are only used to estimate the due date of your baby if this is all you have to go on.If you have more than one ultrasound during your pregnancy, giving you 'multiple dates', then the earliest ultrasound estimate should be used, because it will be more accurate.However, the accuracy of the ultrasound examination is always dependent on the skill of the sonographer and the quality of the equipment.Usually the expected date of delivery (EDD or EDC) is calculated from your last menstrual period - if the early dating scan calculates the EDD to be within 5 days of the EDD from your last menstrual period.The EDD from the early dating scan is used - if the last menstrual period is not known or is unreliable, or the dating scan differs from the last menstrual period dating by more than 5 days.As the baby gets bigger, it starts to express its individual growth potential.
examined the efficacy of routine ultrasound screening in more than 15,000 low-risk pregnant women.
At first glance, it may appear that some of these studies do not report consistent findings in terms of ultrasound's overall accuracy in predicting gestational age.
One must keep in mind, however, that there are differences in both the statistical analysis and in how the results are reported.
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A comprehensive review of this body of literature is beyond the scope of this article; however, there are several studies that warrant mention with regard to pregnancy dating and gestational age assessment.
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This is because the fetus is growing so quickly that there is a big difference in size from week to week.