Urinalysis does not necessarily have to be the first urine, should be based on the purpose of the test collection of random urine, timed urine, special urine, etc., but generally the first urine in the early morning is the most meaningful. Whether the urine specimen collection and processing is correct can directly affect the accuracy of the test results, according to the different purposes of the test, the urine specimen can be divided into morning urine, random urine, timed urine and special urine. 1. Morning urine: the first urine in the early morning, after concentration, acidification, its chemical composition, the concentration of formed components is high, applicable to formed components, chemical composition and early pregnancy test. 2. Random urine: randomly collected urine, its collection is convenient, but many factors affecting, commonly used in outpatient, emergency urine examination. 3. Timed urine: 3-hour urine, 12-hour urine, 24-hour urine, 24-hour urine is more commonly used, refers to the collection of all the urine of the corresponding period of time for the quantitative chemical composition (such as albumin quantitative) examination, etc., commonly used in glomerular disease. 4. Special urine: such as postprandial urine is used to detect postprandial urine sugar; clean mid-range urine is used for urine microbial culture, commonly used in the diagnosis of urinary tract infection. In summary, urinalysis should be based on the purpose of the examination to collect the appropriate urine specimens.