Critical values requiring immediate notification
Potassium under 2.5 or above 6.0 mmol/L Sodium under 120 or above 160 mmol/L Glucose under 2.8 or above 25 mmol/L Hemoglobin under 70 g/L Platelets under 50 ×10⁹/L INR above 5 with bleeding Lactate above 4 mmol/L pH under 7.20 or above 7.60 Calcium (total) under 1.6 or above 3.2 mmol/L A critical value is reported to the prescriber without delay, and the notification is documented with the time. Use this sheet in spaced repetition, pair it with a matching clinical scenario on NursEduc, and always compare values to the person's baseline before drawing conclusions. essential lab result interpretation landmarks a nurse or licensed practical nurse in Quebec should keep in mind for clinical practice and for succeeding on the OIIQ or OIIAQ entry exam. The OIIQ expects critical reading of lab results and identification of values requiring immediate nursing action.