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U.S. Department of Health and Human Services

Radiation-Emitting Products

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Within (Definition)

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When used in the context of numerical or time specific MQSA regulatory limits, the word "within" is intended to include the limit itself. For example, the "Kilovoltage peak (kVp) accuracy and reproducibility" requirement states that "The kVp shall be accurate within +/- 5 percent of the indicated or selected kVp.....". This means that if the indicated kVp is 20 and the measured kVp is 19.0, the unit is compliant with this regulation. Similarly, the "Communication of mammography results to the patients" requirement states that "Each facility shall send each patient a summary of the mammography report written in lay terms within 30 days of the mammographic examination. This means that if a facility performs a mammogram on March 1 and sends the lay summary out on March 31, the facility is compliant with this regulation.