{"uid":"cap_dzgT1QDBZtIdoAm_tuhDw","slug":"daugirdas-1993-kt-v-calculator-a67a8b3a","name":"Daugirdas 1993 Kt/V Calculator","description":"Daugirdas 1993 second-generation single-pool variable-volume Kt/V. Kt/V = -ln(R - 0.008 * t) + (4 - 3.5 * R) * UF / W, with R = post_bun_mg_dl / pre_bun_mg_dl. Numeric Kt/V to 2 decimals. Not a dialysis prescription, not equilibrated eKt/V, not stdKt/V, and not a urea-reduction-ratio tool. magent does not assign KDOQI or other adequacy targets.","url":"https://api.magentlab.com/api/calc/kt_v","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":["pre_bun_mg_dl","post_bun_mg_dl","session_hours","uf_l"],"properties":{"uf_l":{"type":"number","description":"Ultrafiltration volume in litres (0-15). Daugirdas 1993 UF."},"weight_kg":{"type":"number","description":"Post-dialysis body weight in kilograms (1-500). Provide weight_kg or weight_lb, not both."},"weight_lb":{"type":"number","description":"Post-dialysis body weight in pounds (2-1100). Converted as kg = lb × 0.45359237. Provide weight_kg or weight_lb, not both."},"pre_bun_mg_dl":{"type":"number","description":"Predialysis blood urea nitrogen in mg/dL (1-200). Required with post_bun_mg_dl."},"session_hours":{"type":"number","description":"Hemodialysis session length in hours (1.0-8.0). Daugirdas 1993 t."},"post_bun_mg_dl":{"type":"number","description":"Postdialysis blood urea nitrogen in mg/dL (1-200). Required with pre_bun_mg_dl."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"path":"/api/calc/kt_v","count":2,"items":[{"kt_v":1.4,"uf_l":2,"formula":"daugirdas_1993","citation":{"id":"daugirdas-1993","doi":"10.1681/ASN.V451205","pmid":"8305648","title":"Second generation logarithmic estimates of single-pool variable volume Kt/V: an analysis of error","source":"J Am Soc Nephrol. 1993;4(5):1205-1213","authors":"Daugirdas JT"},"weight_kg":70,"disclaimer":"Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.","pre_bun_mg_dl":80,"session_hours":4,"post_bun_mg_dl":24,"formula_expression":"Kt/V = -ln(R - 0.008 * t) + (4 - 3.5 * R) * UF / W"},{"kt_v":1.4,"uf_l":2,"formula":"daugirdas_1993","citation":{"id":"daugirdas-1993","doi":"10.1681/ASN.V451205","pmid":"8305648","title":"Second generation logarithmic estimates of single-pool variable volume Kt/V: an analysis of error","source":"J Am Soc Nephrol. 1993;4(5):1205-1213","authors":"Daugirdas JT"},"weight_kg":70,"disclaimer":"Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.","pre_bun_mg_dl":80,"session_hours":4,"post_bun_mg_dl":24,"formula_expression":"Kt/V = -ln(R - 0.008 * t) + (4 - 3.5 * R) * UF / W"}]}},"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_ZnT6tDD7saoX4cD4WySrf","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 single-pool variable-volume Kt/V for hemodialysis adequacy using the Daugirdas 1993 second-generation formula","exampleAgentPrompt":"Calculate the Daugirdas 1993 single-pool Kt/V for my patient whose pre-dialysis BUN was 72 mg/dL, post-dialysis BUN was 25 mg/dL, session ran 3.5 hours, ultrafiltration was 2.1 litres, and post-dialysis weight was 74 kg.","exampleUseCases":[{"title":"Dialysis adequacy review for HD patient","prompt":"My patient had a pre-BUN of 65 mg/dL, post-BUN of 22 mg/dL, dialysis ran 4 hours, UF was 1.8 litres, and post-dialysis weight is 80 kg — what is their Daugirdas 1993 Kt/V?"},{"title":"Monthly adequacy audit for home HD log","prompt":"I'm reviewing my hemodialysis log: pre-dialysis BUN 58 mg/dL, post-dialysis BUN 18 mg/dL, session 3 hours, ultrafiltration 1.5 litres, post-session weight 68.5 kg. Compute the single-pool variable-volume Kt/V."},{"title":"Nephrology charting assistant","prompt":"For my nephrology notes, calculate Daugirdas Kt/V: predialysis BUN 90 mg/dL, postdialysis BUN 30 mg/dL, treatment time 3.75 hours, UF 2.4 litres, and the patient weighs 165 pounds after dialysis."}],"resultDescription":"A numeric Kt/V value rounded to 2 decimal places, computed using the Daugirdas 1993 formula: Kt/V = -ln(R - 0.008 * t) + (4 - 3.5 * R) * UF / W, where R is the ratio of post-BUN to pre-BUN. The result represents single-pool variable-volume dialysis dose; it is not an equilibrated eKt/V, not a standardized Kt/V, and KDOQI adequacy target assignment is not included.","failureModes":["Missing required parameters (pre_bun_mg_dl, post_bun_mg_dl, session_hours, uf_l) returns a validation error","BUN values outside 1–200 mg/dL range rejected","Session hours outside 1.0–8.0 range rejected","UF volume outside 0–15 litres rejected","Weight outside 1–500 kg (or 2–1100 lb) rejected","Providing both weight_kg and weight_lb simultaneously is rejected","Post-BUN equal to or exceeding pre-BUN produces a mathematically invalid or clinically implausible result","Payment failure (HTTP 402) if x402 payment header is not supplied"],"whenToPreferThis":"Use this endpoint when you need a numerically precise, formula-faithful implementation of the Daugirdas 1993 second-generation single-pool variable-volume Kt/V and have all five required inputs (pre-BUN, post-BUN, session time, UF volume, post-dialysis weight). Prefer it over manual calculation to avoid arithmetic errors. Do not use if you need equilibrated eKt/V, standardized Kt/V, urea reduction ratio, or automated KDOQI target assessment — this endpoint computes only the spKt/V scalar.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T07:10:57.243Z","isFirstParty":false}