Should I avoid morning urine during physical examination and urine routine examination?

Urine routine examination usually does not require deliberately avoiding morning urine, but it is necessary to decide whether to keep morning urine based on the purpose of the test. The main items of urine routine examination include urine specific gravity, urine protein, urine sugar, urine occult blood, urine leukocyte esterase and other indicators.

Morning urine has a high concentration of components due to nighttime concentration, making it suitable for detecting indicators such as urine protein and urine sugar. For diabetes screening, early diagnosis of kidney disease and other situations requiring high sensitivity detection, morning urine can improve the detection rate of abnormal indicators. Some hospitals may require the collection of morning urine to improve the accuracy of testing, especially for special items such as urinary microalbumin. When collecting morning urine, attention should be paid to cleaning the external genitalia to avoid contaminating the sample. The time for collecting mid stream urine for testing after discarding it before urination should not exceed 2 hours.

Random urine is suitable for most routine screenings, such as urinary tract infection testing, pregnancy testing, etc. Random urine sampling is convenient and not limited by time, but some indicators may be false negative due to dilution with drinking water. For urine routine retesting or special item testing, doctors may suggest adjusting the sampling time based on the initial results. Before the urine routine examination, it is necessary to avoid factors that may interfere with the test results, such as vigorous exercise, excessive drinking of water, or intake of vitamin C.

Before conducting a routine urine test, you can consult a doctor to see if you need to urinate in the morning and complete the sampling as required. Maintain a normal diet and daily routine 24 hours before the examination, and avoid consuming foods or medications containing pigments. Women should avoid the menstrual period and the three days before and after it, while men should clean their glans before taking samples. If the test results are abnormal, it is recommended to have a follow-up or further examination under the guidance of a doctor to clarify the diagnosis and intervene in a timely manner.