{"uid":"cap_5CTTs5zXogsKodCN0vY9t","slug":"jacobs-1990-risk-of-malignancy-index-rmi-calculator-fc43df41","name":"Jacobs 1990 Risk of Malignancy Index (RMI) Calculator","description":"Jacobs 1990 risk of malignancy index: RMI = U × M × CA125 (U/ml). Caller assigns ultrasound_score 0, 1, or 3 (never 2) and postmenopausal (M=3 if true, else 1). Returns rmi to 1 decimal and exceeds_200 (true if RMI > 200). Not an ovarian-cancer diagnosis and not later RMI-2 or RMI-3.","url":"https://api.magentlab.com/api/calc/rmi","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":["ca125_u_ml","ultrasound_score","postmenopausal"],"properties":{"ca125_u_ml":{"type":"number","description":"Serum CA125 in U/ml (0-50000). Enters the product unrounded. Jacobs 1990 uses U/ml. magent does not assay CA125."},"postmenopausal":{"type":"boolean","description":"true if postmenopausal (M=3), false if premenopausal (M=1). Jacobs 1990: more than one year since final period, or age >50 after hysterectomy. Caller sets the flag; magent does not date menses."},"ultrasound_score":{"enum":[0,1,3],"type":"integer","description":"Caller-assigned Jacobs 1990 ultrasound score: 0 if no features, 1 if one feature, 3 if two or more of multilocular cyst, solid areas, bilateral lesions, ascites, or intra-abdominal metastases. Never 2. magent does not read ultrasound."}}}},"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_91jTUgPRbp6IVNkQnOGRa","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 Jacobs 1990 Risk of Malignancy Index (RMI = U × M × CA125) for ovarian mass evaluation and flags if RMI exceeds the 200 threshold.","exampleAgentPrompt":"Calculate the Jacobs 1990 RMI for a postmenopausal patient with a CA125 of 85 U/ml and an ultrasound score of 3 — tell me the RMI value and whether it exceeds 200.","exampleUseCases":[{"title":"Gynecologic oncology triage decision","prompt":"My patient has a CA125 of 210 U/ml, her ultrasound shows bilateral lesions and ascites so the ultrasound score is 3, and she is postmenopausal — what is her Jacobs RMI and does it cross the 200 threshold?"},{"title":"Premenopausal low-risk mass screening","prompt":"Can you work out the RMI for a premenopausal patient whose CA125 is 22 U/ml and who has just one ultrasound feature, so ultrasound score 1?"},{"title":"Borderline CA125 with no ultrasound features","prompt":"Run the Jacobs 1990 risk of malignancy index for a postmenopausal woman with a CA125 of 50 U/ml and an ultrasound score of 0 — is her RMI above 200?"}],"resultDescription":"Returns the computed RMI value rounded to one decimal place (RMI = ultrasound_score × menopausal_multiplier × CA125) and a boolean field exceeds_200 indicating whether the RMI surpasses the clinically significant 200 threshold.","failureModes":["Invalid ultrasound_score value (only 0, 1, or 3 accepted — value 2 is not valid per Jacobs 1990)","CA125 value out of supported range (0–50000 U/ml)","Missing required query parameters (ca125_u_ml, ultrasound_score, postmenopausal)","Payment failure or x402 authorization error resulting in 402 response","Non-numeric CA125 input causing schema validation error"],"whenToPreferThis":"Use this endpoint when you need a fast, standards-compliant implementation of the original Jacobs 1990 RMI formula specifically. Prefer it over manual calculation to avoid rounding errors and ultrasound-score misassignment. Note this implements the classic RMI-1 only — not RMI-2 (Tingulstad 1996) or RMI-3 (Tingulstad 1999) — so choose accordingly when the clinical protocol specifies which version to use.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T06:52:02.294Z","isFirstParty":false}