{"uid":"cap_62xsOJc0o1Zd34fN5jpBd","slug":"mandelbrot-1988-intrauterine-rbc-transfusion-volume-calculator-bd0b6525","name":"Mandelbrot 1988 Intrauterine RBC Transfusion Volume Calculator","description":"Mandelbrot 1988 intrauterine RBC transfusion volume: fetoplacental_volume_ml = 1.046 + estimated_fetal_weight_g * 0.14; volume_ml uses the unrounded fetoplacental volume times (hct_final_percent - hct_initial_percent) / hct_donor_percent. Hematocrit arm only; the paper also allowed platelet count — magent does not implement platelets. Caller-assigned estimated fetal weight; magent does not estimate weight from biometry. Not a medical device or transfusion order.","url":"https://api.magentlab.com/api/calc/intrauterine_rbc","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":["estimated_fetal_weight_g","hct_initial_percent","hct_final_percent","hct_donor_percent"],"properties":{"hct_donor_percent":{"type":"number","description":"Donor unit hematocrit as a percent (60-90). Must be strictly greater than hct_final_percent."},"hct_final_percent":{"type":"number","description":"Target fetal hematocrit as a percent (20-60). Must be strictly greater than hct_initial_percent and strictly less than hct_donor_percent."},"hct_initial_percent":{"type":"number","description":"Initial fetal hematocrit as a percent (5-50). Must be strictly less than hct_final_percent."},"estimated_fetal_weight_g":{"type":"number","description":"Caller-assigned estimated fetal weight in grams (200-4000). Required. magent does not estimate fetal weight from biometry."}}}},"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_gpFiZK_cp31Z-OI-erTgb","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":"Calculates the required red blood cell transfusion volume for intrauterine fetal transfusion using the Mandelbrot 1988 formula based on estimated fetal weight and hematocrit values.","exampleAgentPrompt":"Calculate the intrauterine RBC transfusion volume using the Mandelbrot 1988 formula: the fetus weighs 1800 g, initial fetal hematocrit is 18%, target hematocrit is 40%, and the donor unit hematocrit is 75%.","exampleUseCases":[{"title":"Fetal anemia transfusion dosing","prompt":"I need to figure out how many mLs of packed red cells to transfuse for a hydropic fetus — estimated weight 2100 g, starting hematocrit of 15%, we want to get it up to 45%, and the donor unit hematocrit is 80%."},{"title":"Mid-gestation Rh disease management","prompt":"Can you run the Mandelbrot transfusion volume calculation for a 28-week fetus weighing about 1100 g with an initial hematocrit of 22%, a target of 40%, and the blood bank unit coming in at 70% hematocrit?"},{"title":"Repeat intrauterine transfusion planning","prompt":"We're planning a second intrauterine transfusion — fetal weight is now 2500 g, the fetal hematocrit from cordocentesis is 25%, we're aiming for 50%, and the donor pack hematocrit is 85%. What volume should we transfuse?"}],"resultDescription":"Returns the computed fetoplacental volume in mL (using the formula 1.046 + estimated_fetal_weight_g × 0.14) and the calculated RBC transfusion volume in mL (fetoplacental volume × (hct_final − hct_initial) / hct_donor), all expressed as numeric values based on the Mandelbrot 1988 model.","failureModes":["estimated_fetal_weight_g outside 200–4000 g range returns validation error","hct_initial_percent not strictly less than hct_final_percent returns constraint error","hct_final_percent not strictly less than hct_donor_percent returns constraint error","hct_donor_percent outside 60–90% range returns validation error","hct_initial_percent outside 5–50% range returns validation error","missing any required query parameter returns 400 bad request"],"whenToPreferThis":"Use this endpoint when you need to apply the specific Mandelbrot 1988 hematocrit-based formula for intrauterine RBC transfusion volume and already have an externally estimated fetal weight — it does not estimate weight from biometry and does not implement the platelet arm of the original paper. Choose it for programmatic obstetric decision support where a reproducible, formula-driven numeric result is needed.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T12:49:07.128Z","isFirstParty":false}