GS-4:Employees may be appointed at or advanced to GS-4 if they meet any of the criteria in paragraphs (a) through (c) below(a) Six months of qualifying experience as an LPN or LVNor(b) Graduation from an approved school (which may be waived as provided in paragraph 4 of Section C) and one year of experience that involved nursing care work in a hospital, outpatient clinic, nursing home, or other supervised medical, nursing, or patient care facility that provided a practical knowledge of human body structure and sterile techniques and proceduresor(c) Graduation from an approved school of at least 24 months duration. (i) Knowledge and skill in performing support duties for complex diagnostic tests and/or specialized practices or procedures, which include preparing the patient, assisting in the diagnostic examination, preparing and handling specialized instruments or other specialized equipment, and monitoring the patients condition before, during, and following the procedure.