# NICE adult IV maintenance NICE adult IV maintenance Status: LIVE Price: $0.005 USDC `GET /api/calc/nice_iv_maintenance` HTML: https://magentlab.com/docs/nice-iv-maintenance Markdown: https://magentlab.com/docs/nice-iv-maintenance.md Not a medical device. Not a diagnosis, dose, or listing recommendation. ## What it computes Compute NICE CG174 adult hospital routine maintenance water (20, 25, or 30 mL/kg/day), approximately 1 mmol/kg/day sodium, potassium, and chloride each, and the fixed 50–100 g/day glucose range. ## When to use When an agent needs CG174 recommendations 1.4.1 and 1.4.3 routine-maintenance arithmetic and must not invent intraoperative 4-2-1 rates, Holliday–Segar 100/50/20 volumes, or a fluid-type order. ## When not to use - Not a medical device. Not a prescription or infusion-rate order. - Not intraoperative 4-2-1. Not Holliday–Segar 100/50/20 pediatric maintenance water. - Does not choose 0.18% sodium chloride / 4% glucose or any other fluid type. - Obese dosing weight is caller-assigned ideal body weight (CG174 1.4.2); magent does not compute IBW. Volume over 2500 mL is flagged (1.4.4), not capped. ## Formula ``` water_ml_day = ml_per_kg_day * weight_kg; electrolyte_mmol_day = 1 * weight_kg; glucose_g_day_low = 50; glucose_g_day_high = 100 ``` ## Citation [Intravenous fluid therapy in adults in hospital](https://www.nice.org.uk/guidance/cg174) National Institute for Health and Care Excellence NICE Clinical Guideline CG174. 2013 (updated 2017) DOI: none ## Worked example ### 70 kg at 25 mL/kg/day Given: `ml_per_kg_day=25, weight_kg=70` 1. water_ml_day = 25 × 70 = 1750 mL 2. electrolyte_mmol_day = 1 × 70 = 70 mmol 3. glucose 50–100 g/day (fixed 1.4.1) 4. exceeds_2500_ml = 1750 > 2500 → false ### 100 kg at 30 mL/kg/day Given: `ml_per_kg_day=30, weight_kg=100` 1. water_ml_day = 30 × 100 = 3000 mL 2. electrolyte_mmol_day = 1 × 100 = 100 mmol 3. exceeds_2500_ml = 3000 > 2500 → true (1.4.4 warning; volume is not capped) ### 80 kg at 20 mL/kg/day Given: `ml_per_kg_day=20, weight_kg=80` 1. 20 mL/kg/day is the 1.4.3 reduced-initial example for older/frail/renal/HF/refeeding 2. water_ml_day = 20 × 80 = 1600 mL 3. electrolyte_mmol_day = 1 × 80 = 80 mmol 4. exceeds_2500_ml = false ## Also searched as - NICE CG174 - adult IV maintenance - NICE maintenance fluids - 25-30 ml/kg/day - hospital maintenance water - NICE intravenous fluid - adult routine maintenance ## Parameters - `weight_kg` (number, optional): Dosing weight in kilograms (1-500). Provide weight_kg or weight_lb. For obesity, caller assigns ideal body weight (CG174 1.4.2); magent does not compute IBW. - `weight_lb` (number, optional): Dosing weight in pounds (2-1100). Converted as kg = lb * 0.45359237. - `ml_per_kg_day` (integer, required): Routine maintenance water rate: 30 (1.4.1 upper initial 25-30), 25 (1.4.1 lower or 1.4.3 reduced upper), or 20 (1.4.3 reduced initial). Integers 20, 25, or 30 only. ## Bulk (POST) POST the same path with a JSON items array. The first item is the GET unit; each additional item is $0.002. Invalid items return HTTP 400 before settlement. Method: `POST /api/calc/nice_iv_maintenance` Max items: 25 Price: unit_amount + extra_item_amount * (n - 1) (unit 5000 atomic, extra 2000 atomic) Status: PREVIEW - 1 to 25 items. Each item uses the same keys as the GET query parameters. - POST of 1 item costs the same as GET. Lists longer than 25: chunk into multiple POSTs. Extra items still execute; do not pad dummy rows. - The first invalid item fails the whole request (index in the 400 JSON). You are not charged. - HTTP 200 is {count, path, items}. Each items[i] is the GET 200 body for that row. - Catalog misses (empty matches, found=false) stay paid 200s inside that slot. - x402 resource URL is this path plus n and body_sha256. Browsers that prefer text/html get the same paywall as GET; Pay retries POST with the same items. Example request: ```json { "items": [ { "ml_per_kg_day": "25", "weight_kg": "70" }, { "ml_per_kg_day": "25", "weight_kg": "70" } ] } ``` Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/nice-iv-maintenance Example 200: ```json { "count": 2, "path": "/api/calc/nice_iv_maintenance", "items": [ { "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.", "citation": { "authors": "National Institute for Health and Care Excellence", "id": "nice-cg174", "source": "NICE Clinical Guideline CG174. 2013 (updated 2017)", "title": "Intravenous fluid therapy in adults in hospital" }, "formula": "nice_cg174", "formula_expression": "water_ml_day = ml_per_kg_day * weight_kg; electrolyte_mmol_day = 1 * weight_kg; glucose_g_day_low = 50; glucose_g_day_high = 100", "weight_kg": 70.0, "electrolyte_mmol_day": 70, "exceeds_2500_ml": false, "glucose_g_day_high": 100, "glucose_g_day_low": 50, "ml_per_kg_day": 25, "water_ml_day": 1750 }, { "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.", "citation": { "authors": "National Institute for Health and Care Excellence", "id": "nice-cg174", "source": "NICE Clinical Guideline CG174. 2013 (updated 2017)", "title": "Intravenous fluid therapy in adults in hospital" }, "formula": "nice_cg174", "formula_expression": "water_ml_day = ml_per_kg_day * weight_kg; electrolyte_mmol_day = 1 * weight_kg; glucose_g_day_low = 50; glucose_g_day_high = 100", "weight_kg": 70.0, "electrolyte_mmol_day": 70, "exceeds_2500_ml": false, "glucose_g_day_high": 100, "glucose_g_day_low": 50, "ml_per_kg_day": 25, "water_ml_day": 1750 } ] } ``` ## Response fields - `formula` (string): nice_cg174 - `formula_expression` (string): Exact expression used - `weight_kg` (number): Normalized dosing weight in kg - `ml_per_kg_day` (integer): Caller-chosen 20, 25, or 30 mL/kg/day water rate - `water_ml_day` (number): ml_per_kg_day * weight_kg, 1 decimal then integer when whole. Not capped. - `electrolyte_mmol_day` (integer): Approximately 1 mmol/kg/day sodium, potassium, and chloride each - `glucose_g_day_low` (integer): Fixed CG174 1.4.1 lower glucose, 50 g/day - `glucose_g_day_high` (integer): Fixed CG174 1.4.1 upper glucose, 100 g/day - `exceeds_2500_ml` (boolean): true when water_ml_day > 2500 (CG174 1.4.4 warning; volume is not capped) - `citation` (object): NICE CG174 citation - `disclaimer` (string): Not-a-device notice ## Example JSON Frozen fixture. Not a live lookup. ```json { "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.", "citation": { "authors": "National Institute for Health and Care Excellence", "id": "nice-cg174", "source": "NICE Clinical Guideline CG174. 2013 (updated 2017)", "title": "Intravenous fluid therapy in adults in hospital" }, "formula": "nice_cg174", "formula_expression": "water_ml_day = ml_per_kg_day * weight_kg; electrolyte_mmol_day = 1 * weight_kg; glucose_g_day_low = 50; glucose_g_day_high = 100", "weight_kg": 70.0, "electrolyte_mmol_day": 70, "exceeds_2500_ml": false, "glucose_g_day_high": 100, "glucose_g_day_low": 50, "ml_per_kg_day": 25, "water_ml_day": 1750 } ``` ## Errors - HTTP 400 `invalid_nice_iv_maintenance`: NICE CG174 adult maintenance inputs must match dosing weight and water rate 20, 25, or 30 mL/kg/day from that guideline. Returned before settlement; you are not charged. - HTTP 400 `invalid_items`: POST body must be a JSON object with only an items array Returned before settlement; you are not charged. - HTTP 400 `invalid_item_count`: items must be an array of 1 to 25 objects Returned before settlement; you are not charged. - HTTP 400 `invalid_item`: each items entry must be a JSON object Returned before settlement; you are not charged. Shared HTTP 402 and 503: https://magentlab.com/docs/payments ## Related tools - [Maintenance fluids](https://magentlab.com/docs/maintenance-fluids) — Compute Holliday–Segar 1957 daily maintenance water from weight, plus the corresponding hourly milliliters. - [Parkland formula](https://magentlab.com/docs/parkland) — Compute adult Parkland 24-hour crystalloid volume from weight and percent TBSA, with half allotted to the first 8 hours from the time of burn. - [Devine IBW](https://magentlab.com/docs/ibw) — Compute Devine ideal body weight and 0.4 adjusted body weight from height, sex, and actual weight. ## Payment Unpaid requests return HTTP 402 even if query parameters or POST items are missing or invalid, so CDP and agents can index the path. After a PAYMENT-SIGNATURE, invalid params return HTTP 400 JSON before settlement. magent does not charge. Fix the params, then request a new 402 quote for that complete URL. Catalog misses (empty matches, found=false) are valid paid 200s. - GET the tool with Accept: application/json (do not send Accept: text/html unless you want the human paywall). - HTTP 402 means you have not paid. Decode the base64 PAYMENT-REQUIRED header. HTTP 503 is not a new quote. - Sign accepts[0] (exact, EIP-3009) with validBefore = now + maxTimeoutSeconds (600 seconds), or accepts[1] (batch-settlement deposit/voucher) on product GET. Ping and POST {items} stay exact. Magent retries transient facilitator 429/5xx before answering. - Retry the same URL with PAYMENT-SIGNATURE (base64 JSON of accepted and payload). Magent attaches canonical extensions.bazaar on CDP verify/settle; echoing 402 bazaar is optional. - Success is HTTP 200 JSON plus PAYMENT-RESPONSE. exact settles before the tool. batch-settlement verifies (and deposit-settles) before the tool and commits the charge after HTTP 2xx. HTTP 503: retry the same PAYMENT-SIGNATURE. Mint a new exact nonce only after a new HTTP 402. - offered `exact` on eip155:8453: Fixed-price USDC on Base. The buyer authorizes the advertised amount (EIP-3009). magent settles before the tool runs (paymentFlow upfront). extra.assetTransferMethod=eip3009 extra.paymentFlow=upfront. - offered `batch-settlement` on eip155:8453: Payment-channel vouchers claimed later in batches. Exact stays accepts[0]. Same-path POST {items} is still exact. extra.assetTransferMethod=eip3009 extra.paymentFlow=authorization. - not offered `upto`: Not offered. Usage-based: buyer authorizes a ceiling, seller settles the actual amount after work. Reserved for a future metered tool. Not for current calculators or code search. Same-path POST {items} is still scheme exact: one EIP-3009 authorization for GET unit plus $0.002 per extra item. That is not x402 batch-settlement (payment channels / vouchers). Shared HTTP 402 and 503 table: https://magentlab.com/docs/payments Stdio MCP (one process per host): https://magentlab.com/docs/mcp ## Guarantees - HTTP 402 is unpaid, including a missing query. After PAYMENT-SIGNATURE, invalid parameters return HTTP 400 before settlement. You are not charged. HTTP 402 never includes the tool JSON. - exact: settlement finishes before the tool (paymentFlow upfront). batch-settlement: verify/deposit before the tool; chargedCumulativeAmount commits after HTTP 2xx. Uncertain or failed settlement fails closed (HTTP 503). Retry the same PAYMENT-SIGNATURE. - HTTP 402 is unpaid only. Do not sign a second authorization because of a 503. - Execution is timeout-bounded and concurrency-capped. - Calculator inputs are stored encrypted for allowlisted operators (Magent Console). They are not in public logs, SSH lookups, catalog, or rollups. Request logs store path without query.