{"uid":"cap_z7eZCkz-Ja41qjpdPzahI","slug":"ho-2004-iv-steroid-day-3-score-for-severe-uc-ho-index-97bccb72","name":"Ho 2004 IV-Steroid Day-3 Score for Severe UC (Ho Index)","description":"Ho 2004 day-3 IV-steroid score for severe UC (0–9): mean stools (<4 → 0; 4 ≤ x < 6 → 1; 6 ≤ x ≤ 9 → 2; x > 9 → 4), caller-assigned colonic dilatation (+4), albumin <30 g/L (+1; 30 is not low). Failure: 0–1 → 11%, 2–3 → 43%, ≥4 → 85% (ROC ≥4). Not Travis, not Truelove and Witts, not a colectomy order. magent does not count stools, read films, or measure albumin.","url":"https://api.magentlab.com/api/calc/ho_index","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":["mean_stool_frequency","colonic_dilatation"],"properties":{"albumin_g_l":{"type":"number","description":"Serum albumin in g/L (10-60). Provide this or albumin_g_dl, not both. Ho 2004 hypoalbuminaemia is <30 g/L (30 is not low). magent does not assay albumin."},"albumin_g_dl":{"type":"number","description":"Serum albumin in g/dL (1-6). Converted as g/L = g/dL × 10. Provide this or albumin_g_l, not both."},"colonic_dilatation":{"type":"boolean","description":"Caller-assigned colonic dilatation (Ho 2004). true scores 4; false scores 0. magent does not read an abdominal film and does not invent a centimetre cutoff."},"mean_stool_frequency":{"type":"number","description":"Mean stool frequency over the first 3 days of IV steroids, as assigned by the caller (number 0-40). Ho 2004: <4 scores 0; 4 ≤ x < 6 scores 1; 6 ≤ x ≤ 9 scores 2; x > 9 scores 4. Exactly 6 and exactly 9 score 2. magent does not count stools."}}}},"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_NSlxps6WOgBvlvuCt7t7J","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 Ho 2004 day-3 intravenous steroid failure score (0–9) for severe ulcerative colitis and returns the predicted colectomy risk tier.","exampleAgentPrompt":"Calculate the Ho 2004 day-3 IV steroid score for a severe UC patient whose mean stool frequency over the first 3 days is 7, who does not have colonic dilatation, and whose serum albumin is 28 g/L.","exampleUseCases":[{"title":"Day-3 steroid failure risk stratification","prompt":"My IBD patient with severe UC is on day 3 of IV steroids — their mean stool frequency over those 3 days is 8, albumin came back at 26 g/L, and there's no colonic dilatation on imaging. What does the Ho index say about their risk of failing steroids?"},{"title":"High-risk patient with colonic dilatation","prompt":"Severe UC patient, day 3 of IV steroids: mean stool frequency is 10, we're seeing colonic dilatation on the plain film, and albumin is 22 g/L. Run the Ho 2004 score so I know which risk tier they fall into."},{"title":"Low stool frequency borderline assessment","prompt":"Can you compute the Ho index for a severe UC patient with a mean stool frequency of 5 over the first 3 days of IV steroids, no colonic dilatation, and albumin of 35 g/L? I want to see the score and the predicted failure probability."}],"resultDescription":"Returns the Ho 2004 total integer score (0–9), the contributing component scores (stool frequency points, colonic dilatation points, albumin points), and the associated colectomy/steroid-failure risk tier: score 0–1 → ~11% failure risk, 2–3 → ~43%, ≥4 → ~85%. The ROC-derived high-risk threshold is ≥4.","failureModes":["Missing required parameters (mean_stool_frequency or colonic_dilatation) returns a validation error","Providing both albumin_g_l and albumin_g_dl simultaneously is rejected","mean_stool_frequency outside range 0–40 may be rejected","albumin_g_l outside range 10–60 or albumin_g_dl outside 1–6 may be rejected","Network or payment (x402) failure returns no score"],"whenToPreferThis":"Use this endpoint when you need to compute the Ho 2004 day-3 IV steroid severity score specifically — not the Travis criteria, not Truelove and Witts, and not any colectomy ordering system. Ideal when a clinical agent has already collected mean stool frequency over days 1–3 of IV steroid therapy and a colonic dilatation assessment, and optionally a serum albumin, and needs a validated numeric risk tier to support gastroenterology decision-making in severe UC.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T07:05:13.690Z","isFirstParty":false}