{"uid":"cap_rd_8aJj4dE4mkpmUu5F-L","slug":"palchak-2003-pediatric-head-ct-decision-rule-magent-2600d94e","name":"Palchak 2003 Pediatric Head CT Decision Rule (magent)","description":"Palchak 2003. High risk after blunt head trauma in children 0-17 if any applicable predictor: abnormal mental status, clinical signs of skull fracture, history of vomiting, scalp hematoma (only if age <=2), or headache. Else low risk. ct_not_low_risk iff high. Scalp hematoma is parsed at all ages but scores only when age is 0, 1, or 2. Not PECARN, CATCH, CHALICE, Canadian CT Head, or NEXUS. magent does not examine the child or order CT. Not a diagnosis or medical device.","url":"https://api.magentlab.com/api/calc/palchak","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","abnormal_mental_status","clinical_signs_skull_fracture","history_of_vomiting","scalp_hematoma","headache"],"properties":{"age":{"type":"integer","description":"Age in years (integer 0-17). Scalp hematoma is a high-risk predictor only when age is 0, 1, or 2; age 3-17 parse scalp_hematoma but do not score it. Age 18 is rejected."},"headache":{"type":"boolean","description":"Headache as assigned by the caller. true or false. High-risk at all ages 0-17 (Palchak 2003 listed headache as a predictor). magent does not examine the child."},"scalp_hematoma":{"type":"boolean","description":"Scalp hematoma as assigned by the caller. true or false. High-risk only when age is 0, 1, or 2; parsed but not scored when age >= 3. magent does not examine the scalp."},"history_of_vomiting":{"type":"boolean","description":"History of vomiting as assigned by the caller. true or false. High-risk at all ages 0-17."},"abnormal_mental_status":{"type":"boolean","description":"Abnormal mental status as assigned by the caller. true or false. High-risk at all ages 0-17. magent does not examine the child or assign GCS."},"clinical_signs_skull_fracture":{"type":"boolean","description":"Clinical signs of skull fracture as assigned by the caller. true or false. High-risk at all ages 0-17. magent does not examine the child or read a radiograph."}}}},"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_Nyc6T3vr30ad6Fmyd--73","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":"Calculates pediatric head CT necessity risk (high vs. low) using the Palchak 2003 rule for children aged 0–17 after blunt head trauma","exampleAgentPrompt":"Run the Palchak 2003 head CT risk rule for a 2-year-old who has abnormal mental status, a scalp hematoma, and a history of vomiting after a fall — no clinical signs of skull fracture and no headache reported.","exampleUseCases":[{"title":"Infant fall with vomiting triage","prompt":"Can you calculate the Palchak 2003 CT risk for a 1-year-old who fell off a bed? They have a scalp hematoma, no abnormal mental status, history of vomiting, no clinical signs of skull fracture, and no headache."},{"title":"School-age child head trauma assessment","prompt":"Check the Palchak head CT decision rule for a 7-year-old after a soccer collision. They have a headache and abnormal mental status but no scalp hematoma, no vomiting, and no clinical signs of skull fracture."},{"title":"Teenager bike accident CT triage","prompt":"Run the Palchak 2003 rule for a 15-year-old involved in a bike accident. No abnormal mental status, no clinical signs of skull fracture, no vomiting, no scalp hematoma, no headache — all predictors are false."}],"resultDescription":"Returns a risk classification (high or low risk) and a ct_not_low_risk boolean flag indicating whether the patient is NOT low risk (i.e., whether a CT scan may be warranted), based on presence or absence of the Palchak 2003 predictors. Scalp hematoma only counts as a high-risk predictor for ages 0–2.","failureModes":["Age 18 or above is rejected — the rule only covers ages 0–17","Missing required query parameters (age, abnormal_mental_status, clinical_signs_skull_fracture, history_of_vomiting, scalp_hematoma, headache) returns an error","Non-boolean values for boolean fields are rejected","Non-integer or out-of-range age values return a validation error","Payment failure (insufficient USDC balance or x402 protocol issue) returns a 402 response"],"whenToPreferThis":"Use this endpoint when you need a structured, programmatic implementation of the Palchak 2003 pediatric head CT clinical decision rule specifically — not PECARN, CATCH, CHALICE, Canadian CT Head, or NEXUS. It is appropriate for ages 0–17 after blunt head trauma and correctly applies the age-gated scalp hematoma scoring. Prefer this over manual rule lookup when you need machine-readable risk output in an automated clinical decision support workflow.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T12:54:57.834Z","isFirstParty":false}