Clinical Severity Markers

An unstable patient often declares deterioration through changing physiology before the diagnosis is settled. The useful question is not whether one number is high; it is whether the patient is compensating, deteriorating, or responding to treatment. A severity marker is a signal to examine the patient, repeat what matters, and choose the next level of care—not a diagnosis and not permission to ignore clinical concern. For the NP, interpret every marker on three axes: its absolute value, its direction over time, and the context that can distort it. A new oxygen requirement, rising respiratory rate, falling blood pressure, reduced urine output, or altered mentation may demand action even when an aggregate score is low. Conversely, an abnormal lactate, troponin, D-dimer, or natriuretic peptide needs a clinical explanation rather than an automatic label. Canadian emergency departments use the Canadian Triage and Acuity Scale, while inpatient early warning and rapid-response processes are established locally. Canada has no national sepsis-specific mandated bundle, so the hospital’s policy and escalation pathway must be known. The NP’s job is to connect the marker to a timely...