{"uid":"cap_ns-Axr3vbHxgabQAbIOE_","slug":"magent-rebound-hyperbilirubinemia-score-chang-2017-8ba41a31","name":"magent Rebound Hyperbilirubinemia Score (Chang 2017)","description":"Chang 2017 three-variable rebound hyperbilirubinemia score: +15 if GA <38 weeks, −7 × age at phototherapy start in days, −4 × (caller AAP phototherapy threshold − TSB at termination), +50. Scores <20 correspond to a <4% chance of TSB returning to threshold within 72 hours. magent does not assay bilirubin or compute the AAP nomogram. Not Chang 2019. Not a phototherapy order.","url":"https://api.magentlab.com/api/calc/rebound_hyperbilirubinemia","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":["gestational_age_weeks","age_at_initiation_days","tsb_at_termination_mg_dl","phototherapy_threshold_mg_dl"],"properties":{"gestational_age_weeks":{"type":"integer","description":"Gestational age in completed weeks, integer 35-45. Chang 2017 cohort was ≥35 weeks. Scores +15 when <38 weeks; 38 weeks and above score 0. magent does not convert days."},"age_at_initiation_days":{"type":"number","description":"Chronologic age at phototherapy initiation in days (0-14; fractional days allowed). Chang 2017 treated infants before age 14 days. magent does not convert hours."},"tsb_at_termination_mg_dl":{"type":"number","description":"Total serum bilirubin at phototherapy termination in mg/dL (0-40). magent does not assay bilirubin."},"phototherapy_threshold_mg_dl":{"type":"number","description":"Caller-supplied AAP phototherapy threshold in mg/dL at termination (0-40). Difference is (threshold − TSB) and may be negative if TSB is still above threshold. magent does not compute the AAP nomogram."}}}},"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_v_EgRJCIyWhKVPmgnaG9X","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 Chang 2017 three-variable rebound hyperbilirubinemia score to estimate likelihood of TSB returning to phototherapy threshold within 72 hours after stopping phototherapy in neonates.","exampleAgentPrompt":"Use the Chang 2017 rebound score to assess this baby: gestational age 36 weeks, phototherapy started at day 2, TSB at termination was 11.5 mg/dL, and the AAP phototherapy threshold at the time of stopping was 15.0 mg/dL.","exampleUseCases":[{"title":"Preterm infant phototherapy discharge decision","prompt":"I'm considering stopping phototherapy for a 36-week gestational age infant who's 3 days old. TSB at termination is 10.8 mg/dL and the AAP threshold is 14.5 mg/dL — what's the Chang 2017 rebound hyperbilirubinemia score and is the rebound risk below 4%?"},{"title":"Term infant post-phototherapy rebound risk","prompt":"Baby is 38 weeks gestation, phototherapy was started on day 1, TSB when we stopped was 12.0 mg/dL, phototherapy threshold was 17.0 mg/dL. Can you calculate the Chang 2017 rebound score and tell me if there's less than a 4% chance the bilirubin will return to threshold within 72 hours?"},{"title":"Late preterm infant rebound scoring for NICU handoff","prompt":"For handoff notes: 35-week GA neonate, phototherapy initiated at 2.5 days of age, stopped at TSB 13.2 mg/dL, threshold was 15.8 mg/dL. Run the three-variable Chang 2017 rebound hyperbilirubinemia score so we can document the rebound risk."}],"resultDescription":"Returns the computed Chang 2017 rebound hyperbilirubinemia score (a numeric value). Scores below 20 indicate less than a 4% probability that TSB will return to the phototherapy threshold within 72 hours after stopping phototherapy. The endpoint does not itself assay bilirubin, compute AAP thresholds, or issue phototherapy orders.","failureModes":["Missing required query parameters (gestational_age_weeks, age_at_initiation_days, tsb_at_termination_mg_dl, phototherapy_threshold_mg_dl) result in a 400 error","Gestational age outside supported range (35-45 weeks) may yield out-of-cohort results","Age at initiation outside 0-14 days may be outside validated cohort range","TSB or threshold values outside 0-40 mg/dL range may produce unexpected results","Payment not provided or insufficient USDC may result in 402 Payment Required response","Confusing this with Chang 2019 (different model) may yield clinically inappropriate interpretation"],"whenToPreferThis":"Use this endpoint when you need the specific Chang 2017 three-variable rebound hyperbilirubinemia score for neonates ≥35 weeks gestational age being considered for phototherapy discontinuation. Prefer this over generic bilirubin tools when you need a validated, scored risk estimate (with the <20 = <4% rebound risk cutpoint). Do not use if you need the 2019 Chang model, AAP nomogram threshold computation, or actual bilirubin measurement.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T18:43:11.055Z","isFirstParty":false}