8 week ultrasound question

Jenn • 🧒🏼 9-2016, mmc 10-2017, mmc 09-2018, chemical 12-2018 and 4-2019, IVF miscarriage at 12 weeks due to hydrops fetalis 03-2020, IVF 👦 5-2021

Hi Ladies,

Does anyone know what the GA in yellow in the bottom right corner means? I just had my first ultrasound at 8 weeks this morning and am wondering what the 24% means.

Thanks in advance!