Crown-Rump Length

Embryology - 19 Apr 2024 Expand to Translate
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Introduction

Crown-rump length Human embryo (stage 13)

(CRL, greatest length, GL) A measurement used in embryology to more accurately stage the early embryo, also historically called the "greatest length" (GL). Measured from the curvature at the top (crown) to the curvature at the bottom (rump) of the "C-shaped" early embryo.

Used in clinical ultrasound as a measurement between the periods of 7 to 13 weeks as an accurate estimation of the gestational age.

Links: Embryonic Development | Carnegie Stage Comparison | Carnegie Institution - Contributions to Embryology | Human Embryo Collections