What should you know about chorion biopsy?

The phrase can be used in different clinical settings. In oncology, it may refer to tissue removed because gestational trophoblastic disease is suspected. It should not be confused with chorionic villus sampling, a prenatal test used to examine placental cells for fetal genetic conditions.

A pathologist examines the tissue structure and cell appearance. Immunohistochemistry can reveal proteins that help distinguish placental tissue, trophoblastic disease and other conditions. In selected cases, genetic analysis can help determine whether abnormal tissue is pregnancy-related.

The report is interpreted together with symptoms, imaging, pregnancy history and blood hCG measurements. A biopsy result may provide the diagnosis, but sometimes the sample is too small or contains blood and damaged tissue; the team then decides whether other tests or repeat sampling are appropriate.

Confirm the exact procedure name, where the sample will be taken from, the planned anaesthetic and whether you need to pause any medicines that affect bleeding. Do not stop prescribed medication unless the treating team gives specific instructions.

Afterward, follow the written advice about activity, wound or vaginal care and pain relief. Ask when pathology and hCG results are expected, who will explain them and whether imaging is already planned. Keep the care team's contact details available in case symptoms change at home.

Seek urgent assessment for heavy bleeding, fainting, severe or increasing abdominal pain, breathing difficulty or chest pain. Contact the procedural team promptly for fever, worsening redness or swelling at an incision, foul-smelling discharge, pain that is not controlled by the advised medicine, or bleeding that is increasing rather than settling. Use the discharge instructions because expected symptoms differ by biopsy site and method.

Which tissue are you sampling and what diagnoses are being considered? Is this an oncology biopsy or prenatal chorionic villus sampling? How will the sample be obtained? What bleeding or infection signs should I watch for? Will immunohistochemistry or genetic testing be needed? Could the findings lead to imaging, hCG monitoring, surgery or chemotherapy?