With improving living standards, people are paying more attention to physical examinations. Many tests in hospital checkups require the use of sample cups. So, what should we pay attention to when using sample cups?

　　Urine tests in physical examinations, specifically urinalysis, require timely submission. The correct procedure is to collect urine in a sample cup, then transfer a portion into a test tube, and take it to the laboratory for testing. The collected urine is generally the clean midstream urine, with the initial and final portions discarded. The results from this portion of urine are accurate. The catheter should contain at least 10 ml of urine; it shouldn't be only half full to allow for microscopic cell and cast counting. Timely submission prevents changes in composition. The laboratory will complete the urinalysis within two hours of submission. Women should avoid menstruating samples to prevent blood contamination causing false positives.

　　Since some chemical methods, such as oxidation-reduction or microscopic examination, are used to test urine, non-standard urine samples in the sample cup may affect the test results, such as false positives or false negatives. Urinalysis is an important basis for the diagnosis, treatment, and prognosis of kidney diseases. Data must be true and reliable, and correct collection of urine samples is one of the keys to obtaining true and reliable data.

　　Due to less water intake at night, various components excreted by the kidneys into the urine are stored and concentrated in the bladder to improve the positive detection rate. Therefore, morning urine is preferred, but random urine collection is also acceptable. Urinalysis should use a fresh urine sample in a clean sample cup and be submitted promptly. If the urine sample is left for too long, glucose will be broken down by bacteria, destroying casts and cells, affecting the accuracy of the test results.

　　24-hour urine protein quantification, 24-hour urine potassium, sodium, chloride: Collect all urine over 24 hours (if the sample is from 8:00 am to 8:00 am the next day, discard the urine at 8:00 am on the day of collection). After each urination, store the urine in the same sample cup until 8:00 am the next day. The urine from this time should be retained and mixed with all previously collected urine. Keep the urine container in a cool place. Accurately measure the total volume of all urine, write the number in milliliters on the laboratory slip, mix all urine in the same container, and take 10 ml for examination.

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