# Age-Adjusted D-dimer Cutoff Calculator (Righini 2014 ADJUST-PE) > Age-Adjusted D-dimer Cutoff Calculator (Righini 2014 ADJUST-PE) 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 whether PE can be excluded based on the Righini 2014 ADJUST-PE age-adjusted D-dimer cutoff: below 500 ng/mL FEU if age <50, or below age×10 ng/mL FEU if age ≥50. ## Facts - Endpoint: GET https://api.magentlab.com/api/calc/age_adjusted_dimer - Price: $0.005/call - Payment: x402 - Status: unknown - Last checked: 2026-09-15 - Activations on Zero: 0 - Tags: x402 - Canonical page: https://www.zero.xyz/c/age-adjusted-d-dimer-cutoff-calculator-righini-2014-adjust-pe-cc701f56 - Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_75BZOgvmqO_9weQLriglK 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 age-adjusted-d-dimer-cutoff-calculator-righini-2014-adjust-pe-cc701f56 ``` Example prompt: My patient is 67 years old and has a D-dimer of 620 ng/mL FEU — using the Righini 2014 age-adjusted ADJUST-PE cutoff, can PE be excluded? ## When to prefer this Use this endpoint when you need to apply the Righini 2014 ADJUST-PE age-adjusted D-dimer cutoff specifically — i.e., the rule that raises the threshold to age×10 ng/mL FEU for patients aged 50 and above. Prefer this over generic D-dimer lookups when the clinical context is PE rule-out in a low-to-intermediate pretest probability patient and D-dimer values are already in FEU (ng/mL). Do not use for YEARS criteria, Wells score, DDU units, or any diagnostic purpose beyond supporting the ADJUST-PE decision rule. ## Known failure modes - Age outside 18–120 integer range returns a validation error - D-dimer value outside 0–20000 range returns a validation error - D-dimer provided in DDU instead of FEU will produce clinically incorrect results (no unit conversion is performed) - Missing required query parameters (age or d_dimer_ng_ml) returns a 400-level error - Non-integer age value will fail schema validation ## How this service works Age-adjusted D-dimer cutoff (Righini 2014 ADJUST-PE). PE excluded only when D-dimer (ng/mL FEU) is strictly below 500 if age <50 or age×10 if age ≥50. Equality is not excluded. FEU only, not DDU; magent does not convert units. Not a diagnosis, not YEARS, not Wells. ## Output Returns the age-adjusted D-dimer cutoff in ng/mL FEU for the given patient age, whether the provided D-dimer value is strictly below the cutoff (PE excluded), and the rule applied (500 ng/mL if age <50, age×10 if age ≥50). Equality with the cutoff is NOT considered exclusion. ## 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", "d_dimer_ng_ml" ], "properties": { "age": { "type": "integer", "description": "Age in years (18-120). Cutoff is 500 ng/mL FEU when age < 50; age × 10 when age ≥ 50 (age 50 → 500)." }, "d_dimer_ng_ml": { "type": "number", "description": "D-dimer in ng/mL fibrinogen-equivalent units (FEU) as in Righini 2014 (0-20000). PE excluded only when strictly below the age-adjusted cutoff. Equality is not excluded. DDU and other units are not this tool." } } } }, "additionalProperties": false }, "output": { "type": "object", "required": [ "type" ], "properties": { "type": { "type": "string" }, "example": { "type": "object" } } } } } ``` ## Response schema (JSON Schema) ```json { "type": "json", "example": { "path": "/api/calc/age_adjusted_dimer", "count": 2, "items": [ { "formula": "age_adjusted_dimer", "citation": { "id": "righini-2014", "doi": "10.1001/jama.2014.2135", "title": "Age-adjusted D-dimer cutoff levels to rule out pulmonary embolism: the ADJUST-PE study", "source": "JAMA. 2014;311(11):1117-1124", "authors": "Righini M, Van Es J, Den Exter PL, et al." }, "criteria": [ { "met": false, "value": 40, "factor": "age_ge_50" } ], "age_years": 40, "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.", "pe_excluded": true, "d_dimer_ng_ml": 499, "ctpa_indicated": false, "formula_expression": "PE excluded iff d_dimer_ng_ml < (500 if age < 50 else age * 10); D-dimer is ng/mL FEU; equality is not excluded", "d_dimer_threshold_ng_ml": 500 }, { "formula": "age_adjusted_dimer", "citation": { "id": "righini-2014", "doi": "10.1001/jama.2014.2135", "title": "Age-adjusted D-dimer cutoff levels to rule out pulmonary embolism: the ADJUST-PE study", "source": "JAMA. 2014;311(11):1117-1124", "authors": "Righini M, Van Es J, Den Exter PL, et al." }, "criteria": [ { "met": false, "value": 40, "factor": "age_ge_50" } ], "age_years": 40, "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.", "pe_excluded": true, "d_dimer_ng_ml": 499, "ctpa_indicated": false, "formula_expression": "PE excluded iff d_dimer_ng_ml < (500 if age < 50 else age * 10); D-dimer is ng/mL FEU; equality is not excluded", "d_dimer_threshold_ng_ml": 500 } ] } } ``` ## More - Live health (JSON, refreshed every minute): https://www.zero.xyz/c/age-adjusted-d-dimer-cutoff-calculator-righini-2014-adjust-pe-cc701f56/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)