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Screening tool for early identification of bloodstream infection in patients 65 years of age and older

Stock photography legally licensed from Getty Images by Sunnybrook Health Sciences Centre.

This calculator estimates the probability that an older patient (at least 65 years of age) has a bloodstream infection.

Calculation details:


Please enter all fields and click calculate to see results.

Odds ratio:


Probability of bloodstream infection:




In the validation cohort of 486 patients, this tool had a sensitivity of 77%, specificity of 89%, and accuracy of 81%.

Formula: Ln (Odds of Bloodstream Infection) = -150.299 + 3.751(Tmax; °C) + 0.654(PMN;x109/L) + 0.452(Δ LOC) + 0.307(BUN; mmol/L) + 0.154(Glucose; mmol/L) + 0.038(Albumin; g/L) + 0.005(ALT; U/L)

Walker SAN et al. Development and validation of a screening tool for early identification of bloodstream infection in older patients - a retrospective case-control study. BMC Geriatrics 2020;20:6.