I am an LPN and I work in a hospital on a Med-Surg unit. Here is a list of most of the things I cannot do and only an RN can:
Iinitial assessments, regardless of where the patient came from(PACU, ER, direct admit, or another unit); chart on care plans
; document the narrative note; med reconcilliations; initial teaching; verbally reviewing w/patient their discharge instructions(however I can enter the instructions into the computer for the RN to review & then give to the patient); call in prescriptions to pharmacies; hang the 1st dose of IVPB antibiotics; administer any IV push meds, including those that are sometimes run like an IVPB on a pump(most common example I see is Pepcid); access or flush a capped PICC or central line or medport; remove/take out a PICC or central line; anything with PCAs(except take vitals) or med lines(insulin drip, cardizem drip, etc); hang TPN or blood(although I can be 2nd verifier for blood and monitor vital signs); anything to do with chemo; take orders from doctors or even call them; give any PRN meds w/o RN approval; anything dealing with consents; give report to other depts or units regarding patients going for tests, labs, OR, another unit, etc; give updates to families; declare time of death.
As others have posted already, what an LPN can or can't do depends on three main things: 1)the state they are licensed in; 2) the type of facility they are working at(hospital, LTC, clinic, etc); and 3)the policy & procedures of the facility. One LTC facility might allow an LPN to do something that another LTC facility would not. One hospital might allow LPNs to do things that another hospital would not. The most common example is LTC facilities allow LPNs to do things that a majority of hospitals do not. Etc, etc, etc.