# VOCAL-Penn 30-Day Postoperative Mortality Calculator for Cirrhosis > VOCAL-Penn 30-Day Postoperative Mortality Calculator for Cirrhosis is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14). Computes 30-day postoperative mortality probability for cirrhotic patients using the Mahmud 2021 VOCAL-Penn logistic regression model with restricted cubic splines for albumin and platelets. ## Facts - Endpoint: GET https://api.magentlab.com/api/calc/vocal_penn - Price: $0.005/call - Payment: x402 - Status: unknown - Last checked: 2026-09-14 - Activations on Zero: 0 - Tags: x402 - Canonical page: https://www.zero.xyz/c/vocal-penn-30-day-postoperative-mortality-calculator-for-cirrhosis-8c555d11 - Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PcVDAntWTaDFYolrFXsX5 Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently. ## How to call it through Zero Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`): ```sh zero fetch --capability vocal-penn-30-day-postoperative-mortality-calculator-for-cirrhosis-8c555d11 ``` Example prompt: My patient is a 58-year-old with cirrhosis scheduled for elective laparoscopic cholecystectomy — ASA class 3, not obese, no NAFLD. Preoperative labs: albumin 3.2 g/dL, platelets 95 ×10⁹/L, bilirubin 1.8 mg/dL. Can you calculate the VOCAL-Penn 30-day postoperative mortality risk? ## When to prefer this Choose this endpoint when you need the Mahmud 2021 VOCAL-Penn logistic regression specifically — the validated model for 30-day postoperative mortality in cirrhotic patients incorporating restricted cubic splines for albumin and platelets. Prefer it over generic MELD-based or Child-Pugh tools when the clinical question is 30-day surgical mortality rather than liver disease severity, and when the user has pre-assigned ASA class and laboratory values ready. ## Known failure modes - Missing required fields (age, platelets, obesity, fatty_liver_disease, asa_class, emergency, surgery_category) return validation error - ASA class outside 2-4 (e.g. 1 or 5) rejected as out of range - Albumin or bilirubin not provided in any accepted unit returns error - Platelet count or albumin value outside physiologic range returns error - Neither albumin_g_dl nor albumin_g_l provided causes missing parameter error - Neither bilirubin_mg_dl nor bilirubin_umol_l provided causes missing parameter error ## How this service works Mahmud 2021 VOCAL-Penn 30-day postoperative mortality logistic for cirrhosis. log_odds = -5.472096 + 1.061725*ASA + 0.927904*emergency + surgery dummies (laparoscopic abdominal reference) + Stata 3-knot RCS albumin (2.7, 3.7, 4.4) and platelets (75, 152, 271) + 0.1448936*bilirubin - 0.7541669*obesity + 0.8268748*NAFLD. Percent to 1 decimal. Not a surgical order. magent does not assign ASA or read labs. ## Output Returns a numeric 30-day postoperative mortality probability expressed as a percentage to one decimal place, derived from the Mahmud 2021 VOCAL-Penn logistic model intercept and coefficients including ASA class, emergency status, surgery type dummies, restricted cubic spline terms for albumin and platelets, linear bilirubin, obesity, and NAFLD. ## Request schema (JSON Schema) ```json { "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": [ "age", "platelets_10e9_l", "obesity", "fatty_liver_disease", "asa_class", "emergency", "surgery_category" ], "properties": { "age": { "type": "integer", "description": "Age in years (18-120). The Mahmud 2021 Supplement Appendix 30-day linear predictor does not retain age (age is in the 90- and 180-day models). Required because the published tool asks for it." }, "obesity": { "type": "boolean", "description": "Caller-assigned BMI ≥30 kg/m² (true/false). Protective in the 30-day model. magent does not compute BMI." }, "asa_class": { "enum": [ 2, 3, 4 ], "type": "integer", "description": "Caller-assigned ASA physical status 2, 3, or 4 (ordinal in the Appendix). The derivation cohort had no ASA 1 and excluded ASA 5. magent does not assign ASA class." }, "emergency": { "type": "boolean", "description": "Caller-assigned emergency indication (true/false). magent does not classify urgency." }, "albumin_g_l": { "type": "number", "description": "Preoperative albumin in g/L (10-60). Converted as g/dL = g/L / 10." }, "albumin_g_dl": { "type": "number", "description": "Preoperative albumin in g/dL (1.0-6.0). Provide this or albumin_g_l. Restricted cubic spline knots 2.7, 3.7, 4.4 (Supplemental Table 2). magent does not read the laboratory." }, "bilirubin_mg_dl": { "type": "number", "description": "Preoperative total bilirubin in mg/dL (0.1-40). Provide this or bilirubin_umol_l. Linear in the 30-day Appendix model. magent does not read the laboratory." }, "bilirubin_umol_l": { "type": "number", "description": "Preoperative total bilirubin in µmol/L (2-684). Converted as mg/dL = µmol/L / 17.1." }, "platelets_1 … (truncated) ``` ## More - Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vocal-penn-30-day-postoperative-mortality-calculator-for-cirrhosis-8c555d11/health.json - [Zero catalog index](https://www.zero.xyz/llms.txt) - [Other services from api.magentlab.com](https://www.zero.xyz/host/api.magentlab.com/llms.txt)