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Printed on 7/20/2026
For informational purposes only. This is not medical advice.
The ISAR (Identification of Seniors At Risk) score is a brief screening tool used especially in emergency and acute-care settings to identify older adults at increased risk of adverse outcomes such as functional decline, repeated ED visits, hospitalization, and death. It includes six yes/no items related to recent hospitalization, sensory and memory difficulties, medication burden, and dependency. Scores of 2 or more are commonly considered a positive screen requiring closer assessment.
Formula: ISAR total = sum of 6 yes/no items (0 or 1 each), range 0-6; >=2 indicates positive risk screen.
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The ISAR is administered verbally or by paper to older adults presenting to the emergency department or acute-care unit. The six items are: (1) Before the illness/injury that brought you to the ED, did you need someone to help you on a regular basis? (2) Since the illness/injury that brought you to the ED, have you needed more help than usual to care for yourself? (3) Have you been hospitalized for one or more nights during the past 6 months (excluding today's visit)? (4) In general, do you have serious problems with your memory? (5) Do you have vision problems? and (6) Are you currently taking more than three different medications every day? Each question is scored 1 if yes, 0 if no.
Sum the six yes/no items to obtain a total ISAR score ranging from 0 to 6. A score of 2 or higher is the most commonly used and validated threshold for a positive screen, indicating that the patient is at significantly elevated risk for adverse outcomes including functional decline, repeat emergency department visits, hospital admission, and death over the following six months. Some protocols use a threshold of 3 or higher for a more specific (though less sensitive) screen when downstream assessment resources are limited. The key purpose of the threshold is to triage which patients require intensive follow-up versus routine emergency care.
A positive ISAR screen does not provide a diagnosis but identifies patients who need comprehensive geriatric assessment beyond the standard emergency department workup. Positive screens should trigger a structured multi-domain assessment covering functional status, cognition, social support, medication review, nutritional risk, and home safety — typically delivered by a geriatric medicine specialist, emergency department geriatric liaison nurse, or social worker. In settings with dedicated geriatric ED programs, ISAR-positive patients are prioritized for inpatient geriatric consultation, specialized observation units, or close community follow-up within 72 hours of discharge. Negative screens require standard ED care with age-appropriate safety netting.
Emergency physicians, ED nurses, triage coordinators
The ISAR was specifically designed for and validated in the emergency department setting as a rapid triage tool to identify older adults at high risk of adverse post-discharge outcomes. In busy EDs where comprehensive geriatric assessment for every patient over 65 is impractical, ISAR provides an evidence-based screen that takes less than 2 minutes to administer, enabling clinicians to focus intensive resources on the patients who need them most. Studies show ISAR-positive patients have 2–4 times higher rates of functional decline, repeat ED visits, and death within 6 months compared to ISAR-negative patients.
Hospitalists, acute medicine physicians, ward nurses
Beyond the ED, ISAR is useful in acute medical and surgical admission units where rapid identification of high-risk older adults guides care intensity and early geriatric medicine referral. ISAR-positive patients admitted to general medical wards benefit from early involvement of geriatric medicine, social work, and pharmacy teams. Hospital-based geriatric liaison services often use ISAR scores to prioritize their consultation caseload and allocate scarce specialist geriatric resources to the patients at highest risk of in-hospital functional decline, delirium, and adverse discharge outcomes.
Emergency physicians, observation unit teams, care managers
In observation units and short-stay pathways, ISAR helps determine whether a patient can be safely managed with brief observation and discharge or requires hospital admission for more comprehensive assessment and management. ISAR-positive patients in observation units are significantly more likely to require inpatient admission, experience functional decline during their stay, or have an unplanned return visit within 30 days. Integrating ISAR into observation unit protocols supports more proactive safety planning before discharge.
Transitional care nurses, case managers, community health teams
ISAR scores obtained in the ED or during acute care admission predict which patients are most likely to experience adverse outcomes after discharge. Community health services and transitional care programs use ISAR to prioritize post-discharge follow-up contacts — phone calls, home visits, or early primary care appointments — within 72 hours to 1 week for ISAR-positive patients. This targeted follow-up approach improves detection of early deterioration, medication problems, and unmet care needs before they result in a return ED visit.
Health system administrators, quality improvement teams, geriatric service planners
At the system level, ISAR screening data enables healthcare organizations to quantify the burden of high-risk older adults presenting to emergency services, justify expansion of geriatric emergency services, and measure the impact of age-friendly ED initiatives. Tracking ISAR positivity rates over time provides population-level data on geriatric vulnerability in ED populations. This information supports workforce planning, funding applications for geriatric liaison services, and benchmarking of geriatric emergency care quality across hospitals and health systems.
ISAR should be administered as early as possible during the ED visit — ideally during triage or initial nursing assessment — before treatment is started and before the patient's acute distress may be relieved by analgesia, fluids, or antibiotics. Administering ISAR after treatment may underestimate vulnerability because the patient's subjective sense of pre-illness baseline function may be skewed by their improved immediate condition. Early administration ensures the assessment reflects the patient's pre-illness functional baseline and true vulnerability.
When a patient has cognitive impairment, severe acute illness, or communication barriers that prevent reliable self-completion, the ISAR can be completed by a reliable proxy such as a family caregiver or regular home carer. Studies have demonstrated acceptable reliability when ISAR items are obtained from a knowledgeable informant rather than directly from the patient. Document clearly whether the score was patient-completed or proxy-completed, as proxy completion may slightly overestimate vulnerability for items related to subjective symptoms.
In most ED populations of adults aged 65 and older, an ISAR positivity rate of 30–50% at the threshold of 2 is expected. If your rate is much lower, the tool may be administered selectively or the population is unusually fit; if much higher, the screening population may be a high-acuity subset. Calibrating expected positivity rates helps teams plan the capacity needed for downstream geriatric assessment and follow-up services.
The ISAR polypharmacy item specifically asks about more than three different medications taken every day — not five or more as used in many other frailty and geriatric tools. This lower threshold was chosen because even modest polypharmacy (4+ medications) in older ED patients is associated with higher adverse drug reaction risk and functional vulnerability. Document total medication count separately regardless of ISAR score, as polypharmacy review is clinically important in all older adults presenting to emergency services.
The vision item on ISAR captures 'serious problems with vision' — meaning any visual impairment that interferes with daily life, including uncorrected refractive errors, cataracts, macular degeneration, glaucoma, or diabetic retinopathy. Patients who wear glasses are not automatically positive unless their corrected vision remains significantly impaired. However, patients who need glasses but have lost or broken them, or who cannot afford new glasses, should be scored positive because they are functionally visually impaired in their current state.
The ISAR is a self-report screening tool and cannot detect vulnerabilities that patients are unaware of, minimize, or deny — particularly cognitive impairment, which many patients with dementia do not recognize as a 'serious memory problem.' In patients where cognitive impairment is suspected from clinical observation or caregiver concern, always supplement the ISAR with a brief cognitive test such as the [Mini-Cog](/tools/mini-cog) regardless of the ISAR memory item score.
Validation studies for ISAR have been conducted across multiple countries and hospital settings with generally consistent findings, but local validation strengthens the evidence base for institutional use. If your ED has electronic data capture, linking ISAR scores to outcomes (30-day revisit, 6-month hospitalization, functional decline at follow-up) provides powerful local quality evidence and identifies the optimal threshold for your specific patient population.
ISAR does not screen for acute delirium, which requires separate assessment using tools like the [4AT](/tools/4at-delirium) or [Confusion Assessment Method (CAM)](/tools/cam-delirium). In the ED, combining ISAR with a brief delirium screen provides complementary information: ISAR identifies underlying vulnerability, while delirium screening identifies acute superimposed cognitive changes. Patients who are ISAR-positive and delirious represent the highest-risk subgroup and require urgent geriatric consultation and close inpatient observation.
ISAR developed by McCusker J et al. (Acad Emerg Med 1999) in Montreal EDs; score ≥2 predicts functional decline, institutionalization, and 6-month mortality with sensitivity ~80%, specificity ~55%. External validation in multiple ED populations across Canada, Europe, and Australia. Comparative review: Dendukuri N et al. (J Gerontol 2004). Systematic review: Graf CE et al. (Age Ageing 2011). Meta-analysis vs. TRST: Yao C et al. (Age Ageing 2021).
Higher ISAR scores indicate higher short-term vulnerability and support early geriatric-informed care planning.
Use in adults aged 65+ at ED/acute-care presentation for quick risk stratification and referral prioritization.
ISAR emphasizes sensitivity and may generate false positives; follow-up assessment is required before major care decisions.
Disclaimer: This tool is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your health.
April 21, 2026 · trust-baseline
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