What is the common screening interval for average-risk women according to biennial guidelines?

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Biennial screening means the test is done at intervals spaced about two years apart for average-risk women. This pacing aims to balance early cancer detection with limiting radiation exposure and the burden of recalls from too-frequent imaging. So the common interval is every two years. More frequent screening (every year) adds more radiation and potential false positives, while longer gaps (every three or five years) could delay detection; neither aligns with biennial guidelines for average risk.