Would endometriosis or fibroids be found during a colposcopy and biopsy?

No. A colposcopy is for evaluating the cervix and vagina for abnormal appearing areas that could be dysplasia (pre-cancer cells), typically done after an abnormal Pap smear.
Not usu. Not usually, although a bimanual exam of the uterus and adnexa done, too might suggest these diagnoses.

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