👶 Finnegan NAS Score Calculator

The Finnegan Neonatal Abstinence Scoring System grades 21 withdrawal signs in newborns exposed to opioids and other substances in utero. Scores under 8 are mild, 8-11 moderate, and 12+ severe, with treatment commonly started at 8+ across three consecutive scorings or a single 12+. This is a clinical tool for trained staff; score the infant over the observation period above.

How to Use This Tool

Loretta Finnegan developed the scale in the 1970s for neonatal opioid withdrawal. Scoring is done every 3-4 hours, typically after feeds, by nurses trained in the definitions.

How the Weights Work

The weights encode clinical danger: convulsions score 5 because seizures are the most dangerous withdrawal sign, while undisturbed tremors outscore disturbed tremors (4 vs 2) because tremors at rest indicate more severe CNS irritability than tremors only when handled. Sleep scores inversely with duration because withdrawal fragments sleep first. The GI signs (poor feeding, vomiting, loose stools) matter because withdrawal impairs feeding and causes weight loss and dehydration, which is why the score includes them alongside the neurologic signs. Inter-rater reliability is good when staff train on the definitions together; the scale's known weakness is subjectivity in grading cry pitch and tremor severity.

Worked Example

An infant with high-pitched cry (2), sleeping under 2 hours (2), hyperactive Moro (2), mild disturbed tremors (1), no undisturbed tremors (0), increased tone (2), frequent yawning (1), sneezing (1), excessive sucking (1), and loose stools (2): total 2+2+2+1+0+2+1+1+1+2 = 14, severe withdrawal, treatment indicated. A milder case: high-pitched cry (2), sleeping under 3 hours (1), mild disturbed tremors (1), sneezing (1): total 5, mild, supportive care and continued monitoring. I verified the calculator sums the same weights. In practice the trend across scorings matters as much as any single total: rising scores through the 6-10 range predict the need for treatment before the threshold is crossed.

Treatment Thresholds in Practice

Protocols vary by unit: some use the strict 3×8 rule, others use two consecutive 8s or averages. Non-pharmacologic care is the foundation at every level and has been shown to reduce treatment rates: rooming-in with the mother, breastfeeding when not contraindicated, skin-to-skin, and minimizing stimulation. The Eat, Sleep, Console approach, now endorsed by the AAP, de-emphasizes the score itself in favor of functional measures (can the baby eat, sleep, be consoled), with the Finnegan as backup. Know which approach your unit uses; they score and treat differently. For related newborn assessment, our head circumference percentile tracks growth, and our due date calculator dates the pregnancy behind the exposure history.

What the Score Does Not Do

The Finnegan does not identify the substance: opioids, benzodiazepines, SSRIs, and nicotine can all produce scorable signs, and polysubstance exposure is common. It does not work well for preterm infants, whose neurologic signs differ; modified preterm scales exist. It also scores poorly when the infant is already being treated, since medication suppresses the signs the scale measures (which is the point of treatment). Maternal history, urine toxicology, and clinical judgment complete the assessment the score starts.

A Note on Context

Neonatal abstinence scoring happens in a charged context: a withdrawing newborn and a mother who may feel judged. The score is a medical tool for guiding the baby's care, and modern practice pairs it with compassionate, non-punitive care of the mother, including support for her own treatment. Rooming-in and breastfeeding (when the maternal substance and treatment permit) improve outcomes for both. If you are scoring these babies, the kindest thing the number can do is get the infant the right level of care quickly and without stigma.

Documentation Tips for Scoring Nurses

Score at consistent intervals and chart the definitions you used, rather than only the numbers: "high-pitched cry per unit definition" beats "cry 2" when the next nurse takes over. Note confounders on the flowsheet: hunger cries, wet diapers, and room temperature all mimic withdrawal signs, and scoring through them inflates totals. Score after feeds when the baby is settled to separate true irritability from hunger. Inter-rater drift is the known enemy; units that re-train together quarterly keep their scores comparable, and comparable scores are what make the treatment thresholds meaningful.

One more practical point: keep the scoring tool at the bedside, not at the nursing station. Immediate scoring after observation beats reconstructing signs from memory an hour later, and the few minutes it takes are repaid in score reliability that the whole team can trust.

For informational purposes only, not medical advice. Consult a healthcare professional.