{"uid":"cap_Eg42IMgbyDLle4eA25n_9","slug":"pediatric-crohn-s-disease-activity-index-pcdai-calculator-90ef875f","name":"Pediatric Crohn's Disease Activity Index (PCDAI) Calculator","description":"Hyams 1991 Pediatric Crohn's Disease Activity Index (PCDAI): eleven caller-assigned item points. hematocrit and esr are 0, 2.5, or 5; the other nine are 0, 5, or 10. magent sums only (max 100) and does not return activity bands. magent does not examine the child or assign hematocrit age/sex tables. Not a diagnosis. Not CDAI, SES-CD, or PUCAI.","url":"https://api.magentlab.com/api/calc/pcdai","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":["abdominal_pain","stools","well_being","hematocrit","esr","albumin","weight","height","abdomen","perirectal","extra_intestinal"],"properties":{"esr":{"type":"number","description":"Caller-assigned Hyams 1991 PCDAI erythrocyte sedimentation rate points (number 0, 2.5, or 5): 0 for ESR <20 mm/h; 2.5 for 20-50; 5 for >50. magent does not assay ESR. magent does not examine the child."},"height":{"type":"integer","description":"Caller-assigned Hyams 1991 PCDAI height points (integer 0, 5, or 10): at diagnosis 0 <1 channel decrease, 5 ≥1 and <2 channel decrease, 10 ≥2 channel decrease; at follow-up 0 height velocity ≥-1 SD, 5 <-1 SD and >-2 SD, 10 ≤-2 SD. magent does not measure height. magent does not examine the child."},"stools":{"type":"integer","description":"Caller-assigned Hyams 1991 PCDAI stools per day points (integer 0, 5, or 10): 0 for 0-1 liquid stools, no blood; 5 for up to 2 semi-formed with small blood, or 2-5 liquid; 10 for gross bleeding, or ≥6 liquid, or nocturnal diarrhea. magent does not examine the child."},"weight":{"type":"integer","description":"Caller-assigned Hyams 1991 PCDAI weight points (integer 0, 5, or 10): 0 weight gain or voluntary stable/loss; 5 involuntary stable or weight loss 1-9%; 10 weight loss ≥10%. magent does not examine the child."},"abdomen":{"type":"integer","description":"Caller-assigned Hyams 1991 PCDAI abdomen points (integer 0, 5, or 10): 0 no tenderness, no mass; 5 tenderness, or mass without tenderness; 10 tenderness, involuntary guarding, definite mass. magent does not examine the child."},"albumin":{"type":"integer","description":"Caller-assigned Hyams 1991 PCDAI albumin points (integer 0, 5, or 10): 0 for albumin ≥3.5 g/dL; 5 for 3.1-3.4; 10 for ≤3.0. magent does not assay albumin. magent does not examine the child."},"hematocrit":{"type":"number","description":"Caller-assigned Hyams 1991 PCDAI hematocrit points (number 0, 2.5, or 5). The paper's age- and sex-specific hematocrit table is applied by the caller. magent does not assign that table. magent does not examine the child."},"perirectal":{"type":"integer","description":"Caller-assigned Hyams 1991 PCDAI perirectal disease points (integer 0, 5, or 10): 0 none, asymptomatic tags; 5 1-2 indolent fistula, scant drainage, no tenderness; 10 active fistula, drainage, tenderness, or abscess. magent does not examine the child."},"well_being":{"type":"integer","description":"Caller-assigned Hyams 1991 PCDAI patient functioning / general well-being points (integer 0, 5, or 10): 0 no limitation of activities, well; 5 occasional difficulty in maintaining age-appropriate activities; 10 frequent limitation of activities, very poor. magent does not examine the child."},"abdominal_pain":{"type":"integer","description":"Caller-assigned Hyams 1991 PCDAI abdominal pain points (integer 0, 5, or 10): 0 none; 5 mild (brief, does not interfere with activities); 10 moderate/severe (daily, longer lasting, affects activities, nocturnal). magent does not examine the child."},"extra_intestinal":{"type":"integer","description":"Caller-assigned Hyams 1991 PCDAI extra-intestinal manifestation points (integer 0, 5, or 10): 0 none; 5 one; 10 two or more (fever ≥38.5°C for 3 days over the past week, arthritis, uveitis, erythema nodosum, pyoderma gangrenosum). magent does not examine the child."}}}},"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_KBMmhf_lkKiGQlyVYivVD","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 Hyams 1991 PCDAI score (0–100) by summing eleven caller-assigned item points for pediatric Crohn's disease activity assessment.","exampleAgentPrompt":"Calculate the PCDAI score for this patient: abdominal pain 5 points, stools 5 points, well-being 5 points, hematocrit 2.5 points, ESR 2.5 points, albumin 5 points, weight 5 points, height 0 points, abdomen 5 points, perirectal 0 points, extra-intestinal 0 points.","exampleUseCases":[{"title":"Outpatient Crohn's monitoring visit","prompt":"I'm reviewing a follow-up for a 10-year-old with known Crohn's disease. Her assigned item points are: abdominal pain 5, stools 5, well-being 5, hematocrit 5, ESR 5, albumin 5, weight 5, height 5, abdomen 5, perirectal 0, extra-intestinal 0. What's her PCDAI score?"},{"title":"Research cohort disease activity scoring","prompt":"I need to batch-score PCDAI for a study patient. Points are: abdominal pain 10, stools 10, well-being 10, hematocrit 5, ESR 5, albumin 10, weight 10, height 10, abdomen 10, perirectal 5, extra-intestinal 5. Can you compute the total?"},{"title":"Clinical trial eligibility screening","prompt":"For a clinical trial requiring PCDAI ≥30, can you score this child's index? Abdominal pain 5, stools 5, well-being 5, hematocrit 2.5, ESR 0, albumin 5, weight 5, height 5, abdomen 5, perirectal 0, extra-intestinal 0."}],"resultDescription":"Returns the total PCDAI score as a numeric sum (0–100) of the eleven caller-supplied item points. Does not return activity severity bands, diagnostic labels, or clinical interpretation. The calling system is responsible for assigning valid item point values per the Hyams 1991 criteria.","failureModes":["Missing required query parameters returns an error","Non-valid point values (not in the allowed set for each item) may produce unexpected sums or errors","Score interpretation (mild/moderate/severe bands) is not provided by the endpoint","Caller-assigned item points that do not reflect actual clinical findings produce a meaningless score"],"whenToPreferThis":"Use this endpoint when you need a fast, deterministic arithmetic computation of the Hyams 1991 PCDAI total from already-assigned item points. Prefer it over manual calculation to avoid arithmetic errors in multi-item scoring. Do not use it as a substitute for CDAI (adult Crohn's), SES-CD (endoscopic), or PUCAI (ulcerative colitis); those are separate instruments.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T12:51:53.444Z","isFirstParty":false}