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Daugirdas 1993 Kt/V Calculator
x402
Daugirdas 1993 Kt/V Calculator is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Calculates single-pool variable-volume Kt/V for hemodialysis adequacy using the Daugirdas 1993 second-generation formula
Price / call$0.005
Success—
StatusUnknown
How this service works
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.
Output
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.
Example use cases
Dialysis adequacy review for HD patient
“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?”
Monthly adequacy audit for home HD log
“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.”
Nephrology charting assistant
“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.”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/kt_vWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"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"
}
]
}
}Tags
x402
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