For metabolic evaluation of kidney stone formers 24 hours urine collections are still needed.
How do you suspect 24 h urine collections are not appropriate? With a formula?
Does anyone add a commentary in laboratory reports, if the collection is not appropriate ?
This procedure is used by some nephrologists: 24 h urinary creatinine determinated on urine and expressed in mg must be comparable with the weight of the patient multiplicated by 20 for a woman and by 25 for a man
By comparing laboratory tests with previous results, if available. If all measured analytes in a 24-urine sample are below the reference range. We suggest then to the medical personnel, to ask the patient; or to order a new 24-hour collection of urine with a corresponding advice, how to collect properly a 24-urine.
Sighart Golf
Nowadays, it is best to measure the analyte from given urine sample and give result per creatinine.
As we all know creatinin excretion is constatnt so it is alwas better to give report in this way till it is possible.
In many cases, clinicians wants report in 24 hours form than we can ask patient or the concerned sister in the ward. by asking him/her that how did u collected the 24 hour sample? questions to them sometimes give us idea about the quality and quantity of the sample.
24-hour urine collection should be abandoned as there are no verification and control systems. As suggested by Dr Dharmik, the analyte/creatinine ratio in an extemporaneous urine sample is the best solution
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