{"uid":"cap__ZH6TahBNdNHlYpR2RVXE","slug":"gomez-2016-step-by-step-febrile-infant-risk-stratification-c23ad657","name":"Gomez 2016 Step-by-Step Febrile Infant Risk Stratification","description":"Gomez 2016 Step-by-Step for febrile infants 90 days and younger (derivation Mintegi 2014). High if ill-appearing, age 21 days or younger, leukocyturia, or PCT >=0.5 ng/mL; else intermediate if CRP >20 mg/L or ANC >10000/uL; else low. Returns risk, low_risk, high_risk, and intermediate_risk. magent does not examine the infant or assay UA, PCT, CRP, or ANC. Not Rochester, Boston, Philadelphia, or PECARN febrile. Not a medical device and not a discharge, admission, LP, or antibiotic order.","url":"https://api.magentlab.com/api/calc/step_by_step","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_days","well_appearing","leukocyturia","pct_ng_ml","crp_mg_l","anc_per_ul"],"properties":{"age_days":{"type":"integer","description":"Chronological age in days (integer 0-90). Gomez 2016 studied febrile infants 90 days and younger. Age 21 days or younger is high-risk. Age 22 can be low-risk when remaining low-risk criteria hold."},"crp_mg_l":{"type":"number","description":"C-reactive protein in mg/L. Range 0-500. Intermediate (when not already high) if greater than 20 mg/L (20 is not intermediate). magent does not assay CRP."},"pct_ng_ml":{"type":"number","description":"Serum procalcitonin in ng/mL. Range 0.01-100. High-risk if 0.5 ng/mL or greater (0.5 is high). Low-risk requires less than 0.5. magent does not assay procalcitonin."},"anc_per_ul":{"type":"number","description":"Absolute neutrophil count in cells/µL. Range 0-100000. Intermediate (when not already high) if greater than 10000/µL (10000 is not intermediate). magent does not assay ANC."},"leukocyturia":{"type":"boolean","description":"Caller-assigned leukocyturia (urine dipstick / UA leukocytes) as used in Gomez 2016. true means leukocytes are present and is high-risk. true or false. magent does not assay UA."},"well_appearing":{"type":"boolean","description":"Caller-assigned well-appearing as used in Gomez 2016. true or false. Ill-appearing (well_appearing=false) is high-risk. magent does not examine the infant."}}}},"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_7DT7s7enMCgNpc13tzoO7","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":"Classifies febrile infants 90 days and younger into high, intermediate, or low risk for serious bacterial infection using the Gomez 2016 Step-by-Step algorithm (Mintegi 2014 derivation).","exampleAgentPrompt":"Run the Gomez 2016 Step-by-Step febrile infant risk stratification for a 35-day-old infant who is well-appearing, has no leukocyturia, a PCT of 0.3 ng/mL, CRP of 25 mg/L, and ANC of 8500 cells/µL — tell me if they're low, intermediate, or high risk.","exampleUseCases":[{"title":"Febrile neonate 21 days or younger triage","prompt":"Use the Step-by-Step algorithm for a 19-day-old febrile infant who is ill-appearing, has leukocyturia, PCT 0.8 ng/mL, CRP 15 mg/L, and ANC 7000/µL — is this baby high risk?"},{"title":"Borderline intermediate vs low risk infant","prompt":"My patient is a 45-day-old febrile infant, well-appearing, no leukocyturia, PCT 0.2 ng/mL, CRP 22 mg/L, ANC 9500/µL — run the Gomez Step-by-Step algorithm and tell me if this is intermediate or low risk."},{"title":"Confirming low-risk criteria met","prompt":"Can you check if a 60-day-old febrile infant meets low-risk criteria on the Gomez 2016 Step-by-Step? The infant is well-appearing, no leukocyturia, PCT 0.1 ng/mL, CRP 8 mg/L, ANC 6000/µL."}],"resultDescription":"Returns a risk category string ('high', 'intermediate', or 'low') along with three boolean flags — low_risk, intermediate_risk, and high_risk — indicating which tier the infant falls into based on the Gomez 2016 Step-by-Step decision tree applied to the provided clinical values.","failureModes":["Missing required query parameters (age_days, well_appearing, leukocyturia, pct_ng_ml, crp_mg_l, anc_per_ul) returns a validation error","age_days outside 0–90 range may be rejected or produce unreliable results since the rule is validated only for infants ≤90 days","Numeric values outside physiologic ranges (e.g. CRP >500, ANC >100000) may be rejected","Payment failure (x402) if USDC payment is not properly attached"],"whenToPreferThis":"Choose this endpoint when you need to apply specifically the Gomez 2016 Step-by-Step algorithm (Mintegi 2014 derivation) for febrile infants 0–90 days old using PCT, CRP, ANC, leukocyturia, age, and appearance — as opposed to Rochester, Boston, Philadelphia, or PECARN criteria, which are different rulesets this endpoint does not implement.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T13:01:01.988Z","isFirstParty":false}