Fetal crown-rump length and estimation of gestational age in an ethnic Chinese population.
Ultrasound Obstet Gynecol, 33(2): 157-60. [Abstract] [Full-text] ...
A fetus with a crown-rump length more than 15 mm long without cardiac activity.
In utero
Inside the uterus (womb).
5 weeks, but actually that is the normal ultrasound crown-rump length for about 9 weeks gestation.
Ultrasound is accurate give or take one week in the first trimester, so it is normal to be 9 weeks size at 8.5 weeks.
The fetal pole first appears by five and a half to six and a half weeks, and is measured from the top to the curve; this is called the crown-rump length.
7 - 14 weeks: Measuring the crown-rump length gives an accuracy of plus or minus three days at seven weeks ...
Dani - the difference is probably that the OB would have given you a "crown-rump length" (CRL) measurement, which measures the length from head to bottom.
Gestational age (GA) in the first trimester is usually calculated from the fetal crown-rump length (CRL). This is the longest demonstrable length of the embryo or fetus, excluding the limbs and the yolk sac.
3. An ultrasound measurement of the crown-rump length, obtained at 6-11 weeks, supports a gestational age of at least 39 weeks.
Considering all these achievements, it's incredible to think how tiny your baby is. From the top of the head to the middle of her buttocks - what doctors call the crown-rump length - your baby will be a tiny 10-14mm tall: the size of a small bean.
Once the embryo becomes visible, the measurement used to determine age is the CROWN-RUMP LENGTH (CRL).
Ultrasound allows your doctor or provider to measure the length of the fetus from one end to the other in order to obtain the crown-rump length (CRL).
 See also: Pregnancy, Fetus, Pregnant, Ultrasound, Placenta
  
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