{"uid":"cap_58zmxpbQ3z5PwBlvQDQOZ","slug":"magent-chip-rule-calculator-smits-2007-b1c88e89","name":"magent CHIP Rule Calculator (Smits 2007)","description":"Smits 2007 CHIP rule (adults ≥16, GCS 13-15). CT if ≥1 major (pedestrian/cyclist vs vehicle, ejected, vomiting, PTA ≥4 h, skull-fracture signs, GCS <15, GCS drop ≥2 at 1 h, anticoagulants, posttraumatic seizure, age ≥60) or ≥2 minor (fall from elevation, persistent anterograde amnesia, PTA 2 to <4 h, skull contusion, neurologic deficit, LOC, GCS drop of 1 at 1 h, age 40-60). Not a diagnosis; not Canadian CT Head, NEXUS, PECARN, or 2022 CHIP. magent does not examine the patient.","url":"https://api.magentlab.com/api/calc/chip","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":["age","gcs","pedestrian_or_cyclist_vs_vehicle","ejected_from_vehicle","vomiting","pta_ge_4h","clinical_signs_skull_fracture","gcs_deterioration_ge_2","anticoagulant_therapy","posttraumatic_seizure","fall_from_any_elevation","persistent_anterograde_amnesia","pta_2_to_lt_4h","skull_contusion","neurologic_deficit","loss_of_consciousness","gcs_deterioration_1"],"properties":{"age":{"type":"integer","description":"Age in years (integer 16-120). Age ≥60 is a major criterion. Age 40-59 is the 40-60 y minor band; 39 is neither. The published rule is for patients ≥16 years."},"gcs":{"type":"integer","description":"Glasgow Coma Scale integer 13-15 as published. GCS 13 or 14 (GCS <15) is a major criterion; 15 is not. magent does not assign GCS from an exam."},"vomiting":{"type":"boolean","description":"Vomiting (Smits 2007 major). true or false as assigned by the caller. magent does not take a vomit count."},"pta_ge_4h":{"type":"boolean","description":"Posttraumatic amnesia ≥4 hours (Smits 2007 major). true or false as assigned by the caller. Mutually exclusive with pta_2_to_lt_4h. magent does not measure amnesia duration."},"pta_2_to_lt_4h":{"type":"boolean","description":"Posttraumatic amnesia of 2 to <4 hours (Smits 2007 minor). true or false as assigned by the caller. Mutually exclusive with pta_ge_4h. magent does not measure amnesia duration."},"skull_contusion":{"type":"boolean","description":"Contusion of the skull (Smits 2007 minor). true or false as assigned by the caller. magent does not examine the scalp."},"neurologic_deficit":{"type":"boolean","description":"Neurologic deficit (Smits 2007 minor). true or false as assigned by the caller. magent does not examine the patient."},"gcs_deterioration_1":{"type":"boolean","description":"GCS deterioration of 1 point 1 hour after presentation (Smits 2007 minor). true or false as assigned by the caller. Mutually exclusive with gcs_deterioration_ge_2. magent does not assign GCS change."},"ejected_from_vehicle":{"type":"boolean","description":"Ejected from vehicle (Smits 2007 major). true or false as assigned by the caller. magent does not classify mechanism."},"anticoagulant_therapy":{"type":"boolean","description":"Use of anticoagulant therapy (Smits 2007 major). true or false as assigned by the caller. This is the 2007 simple rule, not the 2022 CHIP update. magent does not interpret a coagulation assay."},"loss_of_consciousness":{"type":"boolean","description":"Loss of consciousness (Smits 2007 minor). true or false as assigned by the caller. magent does not take a history."},"posttraumatic_seizure":{"type":"boolean","description":"Posttraumatic seizure (Smits 2007 major). true or false as assigned by the caller. magent does not witness a seizure."},"gcs_deterioration_ge_2":{"type":"boolean","description":"GCS deterioration ≥2 points 1 hour after presentation (Smits 2007 major). true or false as assigned by the caller. Mutually exclusive with gcs_deterioration_1. magent does not assign GCS change."},"fall_from_any_elevation":{"type":"boolean","description":"Fall from any elevation (Smits 2007 minor). true or false as assigned by the caller. magent does not classify mechanism."},"clinical_signs_skull_fracture":{"type":"boolean","description":"Clinical signs of skull fracture (Smits 2007 major): any injury that suggests a skull fracture, such as palpable discontinuity of the skull, leakage of cerebrospinal fluid, raccoon-eye bruising, and bleeding from the ear, as assigned by the caller. true or false. magent does not examine the patient."},"persistent_anterograde_amnesia":{"type":"boolean","description":"Persistent anterograde amnesia, any deficit of short-term memory (Smits 2007 minor). true or false as assigned by the caller. magent does not test memory."},"pedestrian_or_cyclist_vs_vehicle":{"type":"boolean","description":"Pedestrian or cyclist versus vehicle (Smits 2007 major). true or false as assigned by the caller. 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_Q0UZHlKtSf48M8MnWhLUi","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":"Applies the Smits 2007 CHIP clinical decision rule to determine whether an adult minor head injury patient warrants a CT scan based on major and minor criteria","exampleAgentPrompt":"Apply the Smits 2007 CHIP rule to a 58-year-old patient with GCS 14, vomiting once, no anticoagulants, no seizure, was a pedestrian hit by a car, has posttraumatic amnesia lasting about 3 hours, no skull contusion, no neurologic deficit, no loss of consciousness, and no GCS deterioration at 1 hour — should they get a CT?","exampleUseCases":[{"title":"ED triage after pedestrian struck","prompt":"I have a 67-year-old patient who was hit by a car as a pedestrian, GCS is 13, vomiting twice, on warfarin, no seizure, PTA over 4 hours, no skull contusion, no focal neuro deficit, no LOC, and no GCS drop at 1 hour. Run the CHIP rule and tell me if CT is indicated."},{"title":"Fall from ladder minor head trauma","prompt":"Patient is 44 years old, fell off a ladder, GCS 15, no vomiting, not on anticoagulants, no seizure, PTA between 2 and 4 hours, has a skull contusion, no neuro deficit, had a brief LOC, and GCS dropped by 1 at the 1-hour mark — does the CHIP rule say CT is needed?"},{"title":"Anticoagulated elderly patient after syncope fall","prompt":"Can you check the CHIP criteria for a 72-year-old on apixaban who fell and hit their head? GCS is 15, no vomiting, no seizure, no PTA over 4 hours, no PTA between 2-4 hours, no skull contusion, no neuro deficit, no LOC, not ejected, not a cyclist, and GCS hasn't dropped. What does CHIP say?"}],"resultDescription":"Returns a structured result indicating whether CT imaging is recommended under the Smits 2007 CHIP rule, along with which major and minor criteria were met. The caller provides all clinical findings; the API applies the published decision logic and returns a CT-indicated true/false determination with criterion breakdown.","failureModes":["Missing required query parameters (age, GCS, or any boolean criterion) returns a 400 error","Age below 16 or GCS outside 13–15 may produce an error or undefined behavior as the rule only applies to adults with minor head injury","Mutually exclusive pta_ge_4h and pta_2_to_lt_4h both set to true may produce an error or unreliable result","Payment not included or insufficient USDC balance returns a 402 Payment Required response","GCS value outside integer range 13–15 will be rejected as invalid per the published rule"],"whenToPreferThis":"Use this endpoint when you need to apply the specific Smits 2007 CHIP rule for adults (≥16) with minor head injury (GCS 13–15) and want a structured, auditable decision-support output. Prefer this over the Canadian CT Head Rule, NEXUS Head, or PECARN endpoints when the clinical context is adult minor TBI and the Smits 2007 criteria are indicated. This endpoint is purely computational — it does not examine patients or gather clinical data; the caller must supply all pre-assessed values.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T07:06:52.130Z","isFirstParty":false}