What is a normal post-void residual urine?

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There is no definite cut-off between what is clearly normal and clearly abnormal, nor a value above which management targeted towards reducing the residual urine (e.g. by catheter drainage) should be implemented. In older people with less effective bladder emptying, there is a greater tolerance for higher values. In general, 200 ml clearly abnormal. However, even for a value of > 200 ml further assessment and treatment may not necessarily be undertaken e.g. in a frail older person living alone who would not be able to manage catheter care, or who would not be a candidate for any surgical intervention.
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