Urine MSU is mid-stream urine. It is sterile urine that is collected from the bladder by urination, but collecting the urine mid-stream, while voiding (semasa tengah kencing). There is a device (Peezy MSU) for collecting mid-stream urine, but it is not a necessary device.
Mid-Stream Urine Collection (resources):
http://www.nursingtimes.net/Journals/2013/04/10/k/t/k/060502Taking-a-midstream-specimen-of-urine.pdf
http://www.nhs.uk/chq/Pages/how-should-i-collect-and-store-a-urine-sample.aspx?CategoryID=69&SubCategoryID=692
http://www.dublinhealthscreening.ie/MSU_and_urine_screen.asp
http://ministryhealth.org/Services/Lab/PatientInstructions/Collecting_MidStream_Urine.pdf
http://www.apath.co.nz/sites/default/files/Midstreamurineinstructionform.pdf
http://www.news-medical.net/news/20130522/Mid-stream-urine-collection-system-an-interview-with-Giovanna-Forte-Managing-Director-Forte-Medical.aspx
http://www.youtube.com/watch?v=pFVB2QYgcDc