Why do we collect midstream urine for urinalysis?

Nowadays, people are very advanced in the field of medicine, and there are many ways to examine the body, such as B-ultrasound, blood tests, infrared scanning, urine routine tests, etc. Among them, the most common method is to use urine routine test. However, there are some precautions when using urine routine test, that is, midstream urine needs to be taken for test. So why does urine routine test take midstream urine?

Urinalysis usually requires sampling midstream urine. Because the beginning part may involve the influence of bacterial infection around the urethra or at the urethral opening. Taking midstream urine can accurately detect infections inside the urinary system.

Urine examination is a very important examination item, but some people may not know that it is best to collect midstream urine.

The so-called midstream urine refers to urine collected in the middle of urination. If the urine sample is not midstream urine, it will have a certain impact on the test results, such as making the pH value of the urine higher or lower. Although some people know the concept of midstream urine, they are not quick enough and do not know whether the urine sample they collected is midstream urine.

When taking a urine sample, you can control your urination speed and try to go slower, so that it is easier to collect midstream urine. Generally speaking, urine that is produced 1 second after urination can basically be considered midstream urine.

In addition, the following points should be noted during the retention process:

1. When collecting urine, you should use a clean and dry container. The physical examination center provides you with disposable urine cups and urine test tubes.

2. The collected urine sample should be sent for examination within 1 hour to avoid changes in pH that may affect the formed elements in the urine, such as the destruction or shrinkage of red and white blood cells. In particular, only fresh urine samples are required when performing microscopic examination of urine red blood cells.

3. Collect morning urine: It is generally most appropriate to collect morning urine for routine urine examination. Morning urine refers to the first urination when you get up in the morning. It is relatively concentrated and contains more formed components than the diluted urine during the day. It is easier to detect abnormalities in the urine and can also avoid the influence of factors such as diet, drinking water, and exercise.

4. When doing routine urine tests, women should avoid doing it during their menstrual period to prevent vaginal secretions from mixing into the urine and affecting the test results.