Canadian RN Read SI values precisely (calcium and magnesium in mmol/L). Judgment mirrors US RN items: interpret the cluster, prioritize the lethal ECG change, implement orders, and reassess after each intervention. Misreading SI units or delaying when potassium is critical or sodium is < 120 is the usual wrong-answer pattern. Same forks as US RN — calcium gluconate protects but does not lower potassium, magnesium before potassium, slow sodium correction — with SI labs. A calcium of 1.7 mmol/L or magnesium of 0.3 mmol/L is a critical, act-now value. For NCLEX-RN (Canada), questions rarely announce the topic in the first sentence. They hide it inside vitals, labs, and a short story. Your job is to name the clinical problem, justify why it matters now, and select the safest next step for the role you are given—before you let distractors pull you toward busywork or out-of-scope heroics. When two answers feel partly right, pick the one that closes risk first and matches your license in the stem. On the exam, writers often pair stable-sounding options with unstable data—notice the mismatch before...