Sepsis in the Emergency Department: What the Standard of Care Requires
A board-certified emergency physician explains how sepsis presents in the ED, what the standard of care requires once it is suspected, and where delayed-recognition cases turn.
By Jason Koob, MD — board-certified emergency physician and emergency medicine expert witness
When a sepsis case reaches my desk, the first thing I look at isn’t the vital signs. It’s the patient’s age.
Age frames everything that follows. National hospital data show that adults over 65 — particularly those with underlying health conditions — are roughly thirteen times more likely to be hospitalized with sepsis than younger adults. That statistic cuts in two directions when I review a chart. In an older patient, sepsis should have been near the top of the differential from the moment of arrival. And when a younger patient presents in sepsis, that itself demands attention: an uncommon event has occurred, and the record should show it was evaluated with the seriousness an uncommon event deserves.
The disease that hides in plain sight
Sepsis in an older adult often does not look like the sepsis of the textbooks. Age-related changes in immune function blunt the inflammatory response, which means the classic features — fever, rapid heart rate, low blood pressure — may be muted or absent entirely. Instead, sepsis in this population frequently announces itself through vague and easily dismissed changes: new confusion or delirium, a decline in the ability to manage usual activities, falls, unusual fatigue, generalized weakness, dizziness, or new urinary incontinence. An abnormally low body temperature can be as ominous as a fever.
This is why the central question in evaluating an older patient is not “does this match the screening criteria?” but “is this patient different from their own baseline?” Conventional screening tools such as SIRS and qSOFA were not built for the blunted physiology of the elderly and may fail to flag sepsis that is already underway. There is a deeper catch here: because the traditional definition of sepsis itself incorporated the SIRS criteria, “SIRS-negative” sepsis is inherently difficult even to study — yet it is well recognized that older adults can progress from infection to severe sepsis without ever meeting those criteria. A screening tool cannot rule out what it was never calibrated to detect. In this population, vigilance has to extend past the checklist to the early signs of end-organ dysfunction and to subtle vital-sign irregularities — often the first evidence that an older patient is on the way to decompensation, and the window in which earlier intervention is still possible.
The more reliable signals are comparative: confusion that wasn’t there last week, blood pressure or heart rate that departs from the patient’s own normal readings, a lactate or other laboratory value that has moved meaningfully from the individual’s baseline. A family member’s observation that the patient “just isn’t herself,” recorded in a triage or nursing note, can be among the most important lines in the entire chart.
What the standard of care requires
The obligation begins with recognition, and recognition begins with the signals. Abnormal vital signs are the classic trigger: when they appear, the physician is obligated to consider sepsis, and when they appear alongside signs or symptoms suspicious for infection — a productive cough, a urinary source, a wound, an indwelling device — the suspicion must rise accordingly. But “abnormal” has to be read against the patient in front of you, not against a wall chart. As the previous section makes clear, an older adult’s blunted physiology may never produce the textbook numbers — which is why, in that population, a heart rate or blood pressure that departs from the patient’s own baseline, an abnormally low temperature, or the quieter signals of new confusion and functional decline can, in the appropriate clinical context, carry the same obligating force as a classically abnormal vital sign. The standard of care does not require a particular number on the monitor before sepsis enters the differential; it requires the physician to recognize the signal in whatever form the patient’s physiology is able to send it. Considering sepsis then means acting on the consideration: an expedited assessment, appropriate laboratory evaluation including lactate, cultures, and a deliberate decision about treatment.
Once sepsis is suspected, current guidelines set the tempo. For patients with suspected sepsis who do not show signs of shock, the expectation is a completed expedited assessment and initiation of antimicrobial therapy within approximately three hours of recognition. When septic shock or acute organ dysfunction is present, the urgency increases sharply: antibiotics should be administered as soon as possible, with a target of within one hour of recognition, alongside resuscitation and close reassessment.
Those timeframes reflect the consistent finding that in sepsis, delay compounds injury. They are the benchmarks against which the care will be examined — informing, together with the totality of the clinical picture, what the standard of care required.
Where these cases turn: the moment of recognition
Note the phrase both clocks share: of recognition. The one-hour and three-hour windows do not start when the patient arrives; they start when sepsis was recognized — or when it reasonably should have been. In the cases I review, that is where the analysis concentrates. The dispute is rarely about whether antibiotics took ninety minutes instead of sixty once ordered; it is about whether recognition itself came hours late.
Establishing that moment is chart work. The triage vital signs. The first elevated lactate. The nursing note documenting new confusion. The repeat set of worsening vitals that no one re-examined. Read in sequence, the record either shows a clinical team responding to what was in front of it — or signals accumulating on the monitor while the evaluation stood still.
That analysis is rigorously two-sided. The same review that reveals a missed departure from baseline can also demonstrate that a presentation was genuinely benign against every tool available at the time — that the physician met the standard of care even though the outcome was tragic. An honest reading of the record, in either direction, is the entire value of an independent expert.
Dr. Jason Koob is a board-certified emergency physician in full-time community emergency department practice since 2014, and accepts emergency medicine engagements nationwide from both plaintiff and defense counsel. This article is general information, not legal or medical advice, and does not reference any specific case or patient.
