A member asked:

My doc had me get a transvaginal ultrasound for pelvic pain, the tech asked me when the 1st day of my last period was, why did she ask?

5 doctors weighed in across 2 answers

Informational: You can actually see the lining of the uterus (womb) on ultrasound so knowing where you are in your cycle helps to know what they should expect to see.

Answered 7/31/2020

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Multiple reasons: 1) to know if you could be pregnant 2) to know if you might still be bleeding 3) to be able to assess the thickness of your endometrium.

Answered 9/1/2013

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