Lab-score (Serious Bacterial Infection)
Lab-score — a 0-9 score for the risk of serious bacterial infection in young children with fever without source, from CRP band (< 40 mg/L 0 / 40-99 +2 / >= 100 +4), procalcitonin band, and a positive urine dipstick.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- CRP band
- CRP 40-99 mg/L (+2)
- Procalcitonin band
- PCT 0.5-1.99 ng/mL (+2)
Result: Lab-score 4 of 9 — high risk of serious bacterial infection (>= 3).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- < 3
- Low risk of serious bacterial infection.
- >= 3
- High risk of serious bacterial infection (derivation sensitivity ~94%, specificity ~81%). A risk band, not a sepsis-workup, antibiotic, or admission order.
What you enter
- CRP band (< 40 / 40-99 / >= 100 mg/L)
- Procalcitonin band (< 0.5 / 0.5-1.99 / >= 2.0 ng/mL)
- Urine dipstick positive (leukocyte esterase and/or nitrite) (+1)
How this is calculated
Galetto-Lacour A, Zamora SA, Gervaix A. A score identifying serious bacterial infections in children with fever without source. Pediatr Infect Dis J. 2008;27(7):654-656. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.