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Printed on 7/19/2026
For informational purposes only. This is not medical advice.
AIMS65 is a simple bedside risk score for upper GI bleeding severity. It includes Albumin below 3.0 g/dL, INR above 1.5, altered Mental status, Systolic BP at or below 90 mmHg, and Age 65 years or older.
Formula: AIMS65 = sum of 5 binary criteria (0-5 total).
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At initial evaluation of upper GI bleeding, collect five variables available before endoscopy: serum albumin (low if <3.0 g/dL), INR (elevated if >1.5), mental status assessment (altered if disorientation, lethargy, stupor, or coma are present), systolic blood pressure (low if ≤90 mmHg), and patient age (≥65 years). All five variables are obtainable from the initial history, exam, and basic laboratory panel — no endoscopy is required to calculate AIMS65. Document each finding clearly as it arrives.
Each of the five criteria contributes exactly one point if present and zero if absent. Total the positive findings: a score of 0 indicates all five criteria are negative; a score of 5 indicates all are positive. The simplicity of the binary scoring — compared with the continuous variables used in Glasgow-Blatchford — allows rapid bedside calculation without a calculator in most cases.
Use the AIMS65 score to estimate inpatient mortality risk and guide resource allocation: Score 0–1 = low mortality risk (~0.3%) — standard ward admission is generally appropriate with urgent endoscopy within 24 hours. Score 2 = moderate risk (~0.9–3%) — consider step-down or monitored ward bed, early attending involvement. Score 3–5 = high mortality risk (7–15%) — ICU-level monitoring should be considered, multidisciplinary involvement (GI, surgery, critical care), aggressive resuscitation, and earliest possible endoscopy (<12 hours in hemodynamically unstable patients). Document score and disposition rationale.
Emergency physicians
Calculate AIMS65 immediately when a patient presents with hematemesis, coffee-ground emesis, or melena. Use alongside vital signs and hemoglobin to determine care level before GI consultation arrives.
Hospitalists and intensivists
AIMS65 ≥3 identifies patients at 7–15% inpatient mortality — a threshold that justifies ICU admission, continuous monitoring, and early involvement of gastroenterology and surgical teams.
Gastroenterologists
High AIMS65 scores support early (urgent, <12 hours) endoscopy in hemodynamically compromised patients, while low scores (0–1) may allow standard next-day endoscopy without compromising outcomes.
Hospital administrators and charge nurses
AIMS65 provides an objective early severity estimate to support ICU bed planning, blood bank activation, and staffing decisions in facilities managing high UGIB volumes.
Clinical educators and fellows
Teach the difference between AIMS65 (predicts inpatient mortality), Glasgow-Blatchford Score (predicts intervention/transfusion need), and Rockall Score (post-endoscopy rebleeding and mortality) so that each is applied to the right clinical question.
Quality improvement teams
Use AIMS65 as a severity-adjusted benchmark in UGIB outcome audits. Compare observed vs expected mortality across risk strata to identify care gaps and best practices.
Unlike Glasgow-Blatchford Score (which predicts need for intervention or transfusion), AIMS65 was specifically designed and validated for inpatient mortality prediction. Choose your scoring tool based on the clinical question: GBS for 'does this patient need something done?', AIMS65 for 'how likely is this patient to die?'
Glasgow-Blatchford incorporates heart rate, BUN thresholds, hemoglobin, syncope, hepatic disease, and cardiac failure. AIMS65 uses only five binary yes/no criteria all available from the initial basic assessment. This makes AIMS65 faster to calculate at the bedside in a busy emergency department.
AIMS65 can be calculated immediately from history, physical exam, and initial laboratory results. This is a key advantage over the Rockall Score, which requires endoscopic findings (diagnosis and stigmata of recent hemorrhage) and therefore cannot be completed at initial triage.
Head-to-head comparisons (Hyett et al. 2013, multiple meta-analyses) show AIMS65 outperforms GBS for inpatient mortality (AUROC ~0.77 vs ~0.72), while GBS outperforms AIMS65 for predicting blood transfusion need and endoscopic intervention. Use both for complete risk stratification.
Rockall Score incorporates endoscopic diagnosis and stigmata of recent hemorrhage, making it the superior tool for post-endoscopy rebleeding prediction. Reserve Rockall for after endoscopy; use AIMS65 and GBS at triage.
In AIMS65, 'altered mental status' = disorientation, lethargy, stupor, or coma — not simply mild agitation or anxiety. Critically, this criterion is often missed in elderly patients with baseline dementia. Document the patient's baseline cognitive status and compare to the current exam.
Cirrhotic patients often have baseline INR >1.5 due to impaired hepatic synthesis of coagulation factors, even without active coagulopathy from the bleed itself. This means AIMS65 may systematically score higher in cirrhotic patients — incorporate Child-Pugh and MELD score for full hepatic reserve assessment.
Albumin <3.0 g/dL reflects either chronic nutritional depletion/liver disease or acute severe illness (acute-phase response, capillary leak). Its presence in AIMS65 captures both background frailty and acute severity — either way it predicts worse outcomes in UGIB.
ACG and ASGE guidelines acknowledge both scores' complementary roles. Clinically, a patient with AIMS65 ≥2 AND GBS ≥12 represents high-risk for both mortality and intervention need — this combination should trigger immediate GI consultation, ICU consideration, and early endoscopy (<12 hours).
Multiple RCTs and meta-analyses confirm that endoscopy within 24 hours reduces length of stay and rebleeding risk in high-risk UGIB. In hemodynamically unstable patients or those with AIMS65 ≥3, very early endoscopy (<12 hours) after resuscitation is supported by current ACG guidelines (2021).
AIMS65 was developed by Saltzman et al. (Gastrointest Endosc 2011) from 29,222 UGIB patients across 187 US hospitals. Score ≥2 had 15x higher mortality than score 0–1. Prospective validation by Hyett et al. (Gastroenterology 2013) confirmed superiority over GBS for inpatient mortality prediction. A 2014 meta-analysis confirmed AIMS65 AUROC ~0.77 for inpatient mortality vs ~0.72 for GBS. ACG UGIB Clinical Guideline (Laine et al., Am J Gastroenterol 2021) references both AIMS65 and GBS for pre-endoscopy risk stratification.
Higher AIMS65 totals indicate greater short-term mortality risk in upper gastrointestinal bleeding.
Use AIMS65 at initial evaluation of suspected upper GI bleeding to support triage, monitoring intensity, and early disposition planning.
AIMS65 is a prognostic aid and does not replace clinical judgment or therapeutic endoscopy planning. Performance can vary across populations and care settings.
For related assessments, see Glasgow-Blatchford, Rockall Score and Child-Pugh Score.
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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