Is ultrasound probe date of conception right on?

Patient : How accurate is ultrasound probe? i was told 4 weeeks pregnant.
Doctor :   In patients with uncertain last menstrual periods, Ultrasound evaluation to estimate the gestational age must be made as early as possible in pregnancy to arrive at a correct dating for the patient. However there is an error of +- 5-7 days, for more accurate estimation HCG levels also known as the pregnancy hormone should be measured as well. I hope I cleared your doubt.  

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