What is the ratio of CRL to CHL as per their association?

The ratio of CRL (Crown-Rump Length) to CHL (Crown-Height Length) is understood based on their proportional relationship in fetal measurements. In obstetric practice, it has been established that the typical ratio of CRL to CHL aligns with the relationship of 3 CRL being approximately equal to 2 CHL.

This means when assessing fetal development, if you measure the Crown-Rump Length (which is the length of the embryo or fetus from the top of the head to the bottom of the buttocks) and compare it to the Crown-Height Length (which adds the height of the fetus from the top of the head to the heels when in a fully extended position), this ratio signifies their growth proportions and can help in estimating gestational age and fetal viability.

Understanding this ratio is pivotal in prenatal care, as it aids healthcare providers in monitoring normal fetal growth patterns. Other options present different ratios which do not accurately reflect the established associations and measurements within obstetric practices.