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Midstream Specimen of Urine (MSU)
The National Health Service (NHS) and Health Protection Agency recommend a midstream urine sample in order to ensure the sample is not contaminated by bacteria from either your hands or your urethra.

MSU samples are obtained to confirm the diagnosis of a urinary tract infection and to decide on the most effective course of antibiotics to treat it. The aim of collecting a midstream urine sample is to obtain a sample of urine from the middle of your bladder. As urine is normally sterile, a midstream sample is important as the first pass of urine may contain bacteria washed from your skin, which could result in a false positive test result and the prescription of unnecessary antibiotics. The Health Protection Agency recommends obtaining an MSU for routine use.

How to Collect a Midstream Specimen of Urine (MSU)
Prior to providing an MSU you should wash your hands and genitalia. Women should hold open their labia and men should pull back their foreskin. You should begin to urinate, expelling the first burst into the toilet. Then, without stopping the flow, catch some of the midstream in a container. Once the container is full, pass the rest of your urine into the toilet.

Products
Peezy msu: Manufactured in the United Kingdom by Forte Medical, Peezy msu is a funnel shaped device to which the standard Universal Container is attached. A strategically placed small compressed cellulose sponge allows the outlet of the first 10ml of urine, before swelling to stem the flow from the funnel. Urine subsequently rises up the funnel, and into the bottle via the U-Duct, which directs excess urine into the toilet bowl without returning to the funnel or bottle. The Universal Container is then removed from the funnel, sealed with the lid and the funnel is disposed of in the bin.