Crown Rump Length (CRL) measurement at 8 weeks in Pregnancy

CRL(Crown Rump Length) varies from week by week and also day by day. A good increasing CRL means your baby is growing as expected without any issues. The normal CRL at 8 week ranges anywhere from 16.5mm to 24.5mm.

As per the Intergrowth table, the Normal CRL (Crown Rump Length) at 8 weeks 5 days or 6 days should be above 24 mm and it also differs according to percentile.

Gestational AgeCRL (in mm)
8 Weeks 0 days16.5 – 17.5 mm
8 Weeks 1 days18.0 -18.5 mm
8 Weeks 2 days19.0 – 20.0 mm
8 Weeks 3 days20.5 – 21.0 mm
8 Weeks 4 days21.5 – 22.0 mm
8 Weeks 5 days22.5 – 23.5 mm
8 Weeks 6 days24.0 – 24.5 mm
The above table contains values of an IVF but these values might closely correspond to CRL value in any pregnancy

If the baby is measuring higher than these CRL mentioned in the above table, you need not worry as there is a chance that CRL measurement might be wrong (or) your ovulation date and LMP might have been miscalculated!