MSU full form in medical term is Midstream Specimen of Urine. An MSU is basically a pee sample that doctors and nurses ask for to check if you might have a urinary tract infection (UTI), or some other condition that affects your urinary system. It’s called a “midstream” sample because you’re supposed to pee a little bit first, and then pee into a special, sterile container that they give you. Why do they want you to do this? Well, it’s because the first bit of pee that comes out can have germs or other stuff from your skin and private area, and that can mess up the test results. So, by collecting a sample midstream, they can get a better idea of what’s going on in your body without those pesky germs or other contaminants getting in the way.
When you go to collect the sample, the first thing they’ll usually ask you to do is clean your genital area with some wipes or something like that. Then, they’ll give you the container and ask you to start peeing into the toilet like normal. After a few seconds, you’ll want to switch to peeing into the container, making sure to get a good amount in there. Once you’re done, you’ll give the container back to the healthcare provider, and they’ll send it to a lab for testing.