Gestational age
Citation, DOI, disclosures and article data
At the time the article was created Henry Knipe had no recorded disclosures.
View Henry Knipe's current disclosuresAt the time the article was last revised Tariq Walizai had no financial relationships to ineligible companies to disclose.
View Tariq Walizai's current disclosures- Gestational age (GA)
- Estimated date of delivery (EDD)
The gestational age (GA) of an embryo/fetus is most accurately determined by measuring the crown rump length (CRL) in the first trimester. The later the pregnancy, the larger the standard deviation of the estimated gestational age and thus estimated date of delivery (EDD) is less accurate. Mean sac diameter (MSD) before a fetal pole is identified and biparietal diameter (BPD) after 11 weeks can also be used to support the calculation of the gestational age.
The estimated date of delivery (EDD) should be calculated by last menstrual period (LMP) unless 1:
unknown LMP
GA by CRL is <10 weeks and differs from GA by LMP by >5 days
GA by CRL (+/- BPD) is 10-14 weeks and differs from GA by LMP by >7 days
On this page:
Practical points
for twin pregnancies, gestational age is based on the largest twin's CRL 1
Related pathology
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References
- 1. Mizia K, Campbell Westerway S, Robertson M et al. Guidelines for the Performance of the First Trimester Ultrasound. Australas J Ultrason Med. 2018;21(3):179-82. doi:10.1002/ajum.12102 - Pubmed
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- Placental calcification
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- Medical abbreviations and acronyms (G)
- Gestational age
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