Your hospital should complete the on-line MHIRS registration form, check the type of ICU that you have (in this case "medical/surgical") and indicate the number of central line-days for calendar year requested. If you do not know the number of central line-days you may leave that box blank - do not estimate. If the box is left blank, your hospital will be required to report for that ICU. Each year hospitals will report the number of central line-days, by type of ICU, for the preceding year. If an ICU has less than 50 central line-days in the previous calendar year, the hospital will not be required to report on that ICU for the current reporting year.