{"uid":"cap_erhuKgXLXHlrRR5bUkvQ-","slug":"nexus-chest-ct-decision-rule-calculator-rodriguez-2015-2e6db4bd","name":"NEXUS Chest CT Decision Rule Calculator (Rodriguez 2015)","description":"NEXUS Chest CT (Rodriguez 2015). Chest CT-Major is negative only when abnormal CXR, distracting injury, chest-wall, sternal, thoracic-spine, and scapular tenderness are all absent. Chest CT-All is negative only when those six and rapid deceleration mechanism are absent. Presence of a criterion does not mandate CT. Not a diagnosis, not the NEXUS Chest CXR instrument, and not Hoffman 2000 NEXUS C-spine. Enrolled blunt trauma age >14. magent does not examine the patient or read a radiograph.","url":"https://api.magentlab.com/api/calc/nexus_chest_ct","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"headers":{"type":"object","additionalProperties":{"type":"string"}},"queryParams":{"type":"object","required":["abnormal_cxr","distracting_injury","chest_wall_tenderness","sternal_tenderness","thoracic_spine_tenderness","scapular_tenderness","rapid_deceleration_mechanism"],"properties":{"abnormal_cxr":{"type":"boolean","description":"Abnormal chest radiograph as assigned by the caller (paper: any thoracic injury including clavicle fracture, or a widened mediastinum). true means the finding is present and Chest CT-Major is not negative. true or false. magent does not read a radiograph."},"distracting_injury":{"type":"boolean","description":"Painful, distracting injury as assigned by the caller. true means a distracting injury is present and Chest CT-Major is not negative. true or false. magent does not examine the patient."},"sternal_tenderness":{"type":"boolean","description":"Sternal tenderness to palpation as assigned by the caller. true means tenderness is present and Chest CT-Major is not negative. true or false. magent does not palpate the sternum."},"scapular_tenderness":{"type":"boolean","description":"Scapular tenderness to palpation as assigned by the caller. true means tenderness is present and Chest CT-Major is not negative. true or false. magent does not palpate the scapula."},"chest_wall_tenderness":{"type":"boolean","description":"Chest-wall tenderness to palpation as assigned by the caller. true means tenderness is present and Chest CT-Major is not negative. true or false. magent does not palpate the chest."},"thoracic_spine_tenderness":{"type":"boolean","description":"Thoracic-spine tenderness to palpation as assigned by the caller. true means tenderness is present and Chest CT-Major is not negative. true or false. magent does not palpate the thoracic spine."},"rapid_deceleration_mechanism":{"type":"boolean","description":"Rapid deceleration mechanism as assigned by the caller (paper: fall from >20 feet or motor vehicle crash >40 mph with sudden deceleration). true means the finding is present and Chest CT-All is not negative. true or false. magent does not classify mechanism."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_foYhHULLUMclhECypv400","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Computes the NEXUS Chest CT-Major and Chest CT-All negativity criteria for blunt trauma patients to guide chest CT ordering decisions","exampleAgentPrompt":"For a blunt trauma patient (age >14) with an abnormal chest X-ray but no distracting injury, no chest-wall tenderness, no sternal tenderness, no thoracic spine tenderness, no scapular tenderness, and no rapid deceleration mechanism — run the NEXUS Chest CT Rodriguez 2015 rule and tell me whether Chest CT-Major and Chest CT-All are negative.","exampleUseCases":[{"title":"Post-MVA chest CT triage","prompt":"My blunt trauma patient was in a car crash with rapid deceleration. CXR is normal, no distracting injury, no chest-wall, sternal, thoracic spine, or scapular tenderness. Apply the NEXUS Chest CT Rodriguez 2015 rule — are both Chest CT-Major and Chest CT-All negative?"},{"title":"Fall victim chest CT evaluation","prompt":"Trauma patient fell from height, age 22. CXR is abnormal, distracting injury present, no sternal tenderness, no thoracic spine tenderness, no scapular tenderness, no chest-wall tenderness, no rapid deceleration. Run the NEXUS Chest CT criteria and tell me what the rule says for CT-Major and CT-All."},{"title":"Assault victim with chest tenderness","prompt":"I have a blunt trauma patient, age 35, hit in the chest during an assault. CXR is normal, no distracting injury, chest-wall tenderness is present, sternal tenderness absent, thoracic spine tenderness absent, scapular tenderness absent, no rapid deceleration mechanism. Calculate the NEXUS Chest CT-Major and CT-All negativity per Rodriguez 2015."}],"resultDescription":"Returns whether NEXUS Chest CT-Major is negative (all six criteria absent: abnormal CXR, distracting injury, chest-wall tenderness, sternal tenderness, thoracic spine tenderness, scapular tenderness) and whether Chest CT-All is negative (those six plus rapid deceleration mechanism all absent). A negative result means CT may be safely deferred per the rule; presence of any criterion means the respective instrument is not negative. Does not mandate or prohibit CT ordering.","failureModes":["Missing required boolean query parameters returns an error","Patient age ≤14 is outside the enrolled population and results may not be valid (not validated for pediatric patients)","Misclassification of clinical findings by caller leads to incorrect rule output — magent does not independently examine the patient or read radiographs","Rule output is not a diagnosis and should not replace clinical judgment"],"whenToPreferThis":"Use this endpoint when you need to apply the Rodriguez 2015 NEXUS Chest CT decision rule specifically (not the NEXUS Chest CXR instrument or Hoffman 2000 NEXUS C-spine rule) for adult blunt trauma patients (age >14). Prefer this over manual rule application to ensure consistent, reproducible scoring. Distinct from general trauma scoring APIs because it implements the specific seven-criterion NEXUS Chest CT framework with separate CT-Major and CT-All outputs.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T18:42:49.035Z","isFirstParty":false}