# Magent Reticulocyte Index Calculator > Magent Reticulocyte Index 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 corrected reticulocyte count (CRC), Hillman 1969 maturation-shift reticulocyte index (RI), and optionally absolute reticulocyte count (ARC) from retic%, hematocrit, and optionally RBC count. ## Facts - Endpoint: GET https://api.magentlab.com/api/calc/reticulocyte_index - 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/magent-reticulocyte-index-calculator-01edff55 - Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pBa13k4rE8rd3mXWD8kxy 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 magent-reticulocyte-index-calculator-01edff55 ``` Example prompt: My patient has a reticulocyte percent of 2.4% and a hematocrit of 28% — can you calculate the corrected reticulocyte count and the Hillman reticulocyte index? Their RBC is 3.1 million/µL so include the absolute reticulocyte count too. ## When to prefer this Use this endpoint when you need a deterministic, citation-backed computation of the corrected reticulocyte count and Hillman maturation-shift reticulocyte index — especially in automated clinical documentation, EMR enrichment, or anemia classification workflows. Prefer over general LLM-based calculation when reproducibility and published arithmetic with citation are required. ## Known failure modes - Reticulocyte percent out of range (0.1–30) returns validation error - Hematocrit out of range (10–70) returns validation error - RBC out of range (1.0–8.0 million/µL) when provided returns validation error - Missing required parameters (reticulocyte_percent or hematocrit_percent) returns 400 error - Payment header missing or insufficient USDC triggers 402 payment required ## How this service works Corrected reticulocyte count (retic% × Hct/45), Hillman 1969 maturation-shift reticulocyte index, and optional absolute reticulocyte count. Deterministic published arithmetic with citation; not a marrow diagnosis. ## Output Returns the corrected reticulocyte count (retic% × Hct/45), the Hillman 1969 maturation-shift reticulocyte index using discretized maturation days (1.0 at Hct ≥40%, 1.5 at ≥30%, 2.0 at ≥20%, 2.5 below 20%), and optionally the absolute reticulocyte count per µL when RBC is provided. Includes the cited formula and interpretive context. ## 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": [ "reticulocyte_percent", "hematocrit_percent" ], "properties": { "rbc_million_ul": { "type": "number", "description": "RBC count in 10^6/µL (1.0-8.0). When provided, ARC_per_uL is returned. Omitted omits ARC." }, "hematocrit_percent": { "type": "number", "description": "Hematocrit as a percent (10-70). CRC uses Hct/45. Maturation days: ≥40 → 1.0; ≥30 → 1.5; ≥20 → 2.0; else 2.5 (Hillman 1969 shift discretized)." }, "reticulocyte_percent": { "type": "number", "description": "Reticulocyte percent of RBC (0.1-30)." } } } }, "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/reticulocyte_index", "count": 2, "items": [ { "formula": "reticulocyte_index", "citation": { "id": "hillman-1969", "doi": "10.1172/JCI106002", "title": "Characteristics of marrow production and reticulocyte maturation in normal man in response to anemia", "source": "J Clin Invest. 1969;48(3):443-453", "authors": "Hillman RS" }, "arc_per_ul": 100000, "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.", "maturation_days": 1, "formula_expression": "CRC = reticulocyte_percent * (hematocrit_percent / 45); RI = CRC / maturation_days; ARC_per_uL = reticulocyte_percent/100 * rbc_million_ul * 1e6 when RBC is given", "hematocrit_percent": 45, "reticulocyte_index": 2, "reticulocyte_percent": 2, "corrected_reticulocyte_percent": 2 }, { "formula": "reticulocyte_index", "citation": { "id": "hillman-1969", "doi": "10.1172/JCI106002", "title": "Characteristics of marrow production and reticulocyte maturation in normal man in response to anemia", "source": "J Clin Invest. 1969;48(3):443-453", "authors": "Hillman RS" }, "arc_per_ul": 100000, "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.", "maturation_days": 1, "formula_expression": "CRC = reticulocyte_percent * (hematocrit_percent / 45); RI = CRC / maturation_days; ARC_per_uL = reticulocyte_percent/100 * rbc_million_ul * 1e6 when RBC is given", "hematocrit_percent": 45, "reticulocyte_index": 2, "reticulocyte_percent": 2, "corrected_reticulocyte_percent": 2 } ] } } ``` ## More - Live health (JSON, refreshed every minute): https://www.zero.xyz/c/magent-reticulocyte-index-calculator-01edff55/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)