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Hello and welcome to JA. I am reviewing your query and will be rihht back.
Well colposcopy is a camera guided method by which biopsy is taken from area found suspicion on pap smear. Its only done after pap is abnormal. You can say its more definitive then pap regarding detecting any precancerous or cancerous changes in the cells lining the cervix. Pap can be abnormal due to viral mainly HPV infections . Hence periodic monitoring plan is advised just to catch any precancerous changes well in time.
Well colposcopy is a camera guided biopsy, they look at the whole cervix with camera and take biopsies from the most abnormal or suspicious looking areas. Progression to cancer can take a while thats while monitoring is advised but you might not get a cancer at all too .
The biopsy is taken after having looked at the cervix in length through the camera so it covers fairly good area of the entire cervix. Any abnormality is easily picked on biopsy if there is any.
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Wishing you a healthy life.