CRIB / CRIB-II Calculator
Clinical Risk Index for Babies — computes score and interpretation; CRIB-II also estimates predicted death/survival from the published logistic equation.
Choose score
CRIB-II inputs
Uses: sex + birthweight-for-gestation points, admission temperature, base excess.
CRIB (Clinical Risk Index for Babies) and CRIB-II are neonatal illness-severity scores designed to estimate early risk of in-hospital death and support risk adjustment when comparing outcomes across NICUs (audit/research). They are not meant to replace bedside clinical assessment—rather, they standardize “how sick was this baby early on?” using a small set of objective variables. PubMed
CRIB (original)
The original CRIB score is calculated from measurements in the first 12 hours of life/admission, using: birthweight, gestational age, congenital malformations, worst (most acidotic) base excess, and minimum/maximum appropriate FiO₂. PubMed
Higher scores indicate greater physiological derangement / respiratory support needs and higher mortality risk.
CRIB-II (update)
CRIB-II was developed to simplify data collection and reduce treatment-related bias (e.g., oxygen targeting), using five items recorded on admission/early after admission: sex, birthweight in relation to gestation, admission temperature, and base excess (with a defined point system). Pediatrics in Review
A commonly cited logistic equation converts the CRIB-II score to a predicted death probability (population-level estimate):
Logit = −6.476 + 0.45 × CRIB-II, then p(death) = e^Logit / (1 + e^Logit).
