NICE NG29 pediatric IV maintenance

NICE pediatric IV

Compute NICE NG29 routine IV maintenance for children and young people from Holliday–Segar daily volume, the 1.4.1 sex cap, and the 1.4.9 ADH-risk restriction.

LIVE $0.005 USDC GET /api/calc/nice_pediatric_iv

Markdown: /docs/nice-pediatric-iv.md · Canonical: https://magentlab.com/docs/nice-pediatric-iv

Not a medical device. Not a diagnosis, dose, or listing recommendation.

What it computes

Compute NICE NG29 routine IV maintenance for children and young people from Holliday–Segar daily volume, the 1.4.1 sex cap, and the 1.4.9 ADH-risk restriction.

When to use

When an agent needs NICE NG29 1.4.1/1.4.9 pediatric maintenance milliliters for children and young people and must not invent a volume, apply unreduced Holliday–Segar, use neonate day-of-life table 1.4.2, or apply adult CG174.

When not to use

Not a medical device. Deterministic published-formula output only.
Not a treatment order or IV prescription. Does not choose fluid type, electrolyte additives, or infusion-rate safety limits.
Children and young people only (NICE NG29 1.4.1 and 1.4.9). Does not implement the term-neonate day-of-life table in 1.4.2.
Applies the 1.4.1 24-hour caps (males rarely need more than 2500 mL; females rarely need more than 2000 mL) and optional 1.4.9 restriction at 50%, 80%, or 100% of the capped volume. This is not unreduced Holliday–Segar (maintenance-fluids) and not adult NICE CG174.
Hourly milliliters are restricted_ml / 24 to 1 decimal. The later bedside 4-2-1 mL/kg/h rule is not applied.

Formula

holliday_ml = 100*min(kg,10) + 50*max(0, min(kg,20)-10) + 20*max(0, kg-20); capped_ml = min(holliday_ml, male 2500 else 2000); restricted_ml = capped_ml * restriction_percent / 100; hourly_ml = restricted_ml / 24

Citation

Title: Intravenous fluid therapy in children and young people in hospital
Authors: National Institute for Health and Care Excellence
Source: NICE Guideline NG29. 2015 (updated 2020)
DOI: none

Worked example

30 kg female, no restriction

Given: restriction_percent=100sex=femaleweight_kg=30

first 10 kg: 100 × 10 = 1000 mL
next 10 kg: 50 × 10 = 500 mL
remaining 10 kg: 20 × 10 = 200 mL
holliday_ml = 1700 mL
female cap 2000 mL → capped_ml = min(1700, 2000) = 1700 mL
restriction_percent 100 → restricted_ml = 1700 mL
hourly_ml = 1700 / 24 = 70.833… → 70.8

30 kg male, 50% ADH-risk restriction

Given: restriction_percent=50sex=maleweight_kg=30

holliday_ml = 1700 mL
male cap 2500 mL → capped_ml = min(1700, 2500) = 1700 mL
restriction_percent 50 → restricted_ml = 850 mL
hourly_ml = 850 / 24 = 35.416… → 35.4

80 kg female, no restriction (1.4.1 cap)

Given: restriction_percent=100sex=femaleweight_kg=80

holliday_ml = 100×10 + 50×10 + 20×60 = 2700 mL
female cap 2000 mL → capped_ml = min(2700, 2000) = 2000 mL
restriction_percent 100 → restricted_ml = 2000 mL
hourly_ml = 2000 / 24 = 83.333… → 83.3

Also searched as

NICE NG29
pediatric IV fluids
Holliday Segar NICE
pediatric maintenance restriction
NG29 intravenous fluid therapy
NICE children IV maintenance
ADH restriction fluids
pediatric IV maintenance volume

Try

Opens the live endpoint. Unpaid browser requests show the paywall; agents should send Accept: application/json.

/api/calc/nice_pediatric_iv?weight_kg=30&sex=female&restriction_percent=100

Full URL: https://api.magentlab.com/api/calc/nice_pediatric_iv?weight_kg=30&sex=female&restriction_percent=100

Call

Expect HTTP 402 until you retry with PAYMENT-SIGNATURE. Incomplete query params return HTTP 400 before any quote or charge.

curl -i -H "Accept: application/json" "https://api.magentlab.com/api/calc/nice_pediatric_iv?weight_kg=30&sex=female&restriction_percent=100"

Parameters

Name	Type	Required	Description
`weight_kg`	number	optional	Weight in kilograms (1-500). Provide weight_kg or weight_lb.
`weight_lb`	number	optional	Weight in pounds (2-1100). Converted as kg = lb * 0.45359237.
`sex`	string	required · female, male	Sex for the NICE NG29 1.4.1 24-hour cap (female 2000 mL; male 2500 mL).
`restriction_percent`	integer	required · 50, 80, 100	NICE NG29 1.4.9 ADH-risk restriction as a percent of the capped daily volume. 50, 80, or 100 (100 = no restriction).

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.

POST /api/calc/nice_pediatric_iv Max 25 unit_amount + extra_item_amount * (n - 1) extra $0.002 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 (fixture)

{
  "items": [
    {
      "restriction_percent": "100",
      "sex": "female",
      "weight_kg": "30"
    },
    {
      "restriction_percent": "100",
      "sex": "female",
      "weight_kg": "30"
    }
  ]
}

Open bulk paywall →

Opens a two-item fixture on the API host. Unpaid browsers get the same MetaMask paywall as GET; Pay retries POST with those items.

Example 200 (fixture)

{
  "count": 2,
  "path": "/api/calc/nice_pediatric_iv",
  "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-ng29",
        "source": "NICE Guideline NG29. 2015 (updated 2020)",
        "title": "Intravenous fluid therapy in children and young people in hospital"
      },
      "formula": "nice_ng29",
      "formula_expression": "holliday_ml = 100*min(kg,10) + 50*max(0, min(kg,20)-10) + 20*max(0, kg-20); capped_ml = min(holliday_ml, male 2500 else 2000); restricted_ml = capped_ml * restriction_percent / 100; hourly_ml = restricted_ml / 24",
      "sex": "female",
      "weight_kg": 30.0,
      "hourly_ml": 70.8,
      "capped_ml": 1700,
      "holliday_ml": 1700,
      "restricted_ml": 1700,
      "restriction_percent": 100
    },
    {
      "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-ng29",
        "source": "NICE Guideline NG29. 2015 (updated 2020)",
        "title": "Intravenous fluid therapy in children and young people in hospital"
      },
      "formula": "nice_ng29",
      "formula_expression": "holliday_ml = 100*min(kg,10) + 50*max(0, min(kg,20)-10) + 20*max(0, kg-20); capped_ml = min(holliday_ml, male 2500 else 2000); restricted_ml = capped_ml * restriction_percent / 100; hourly_ml = restricted_ml / 24",
      "sex": "female",
      "weight_kg": 30.0,
      "hourly_ml": 70.8,
      "capped_ml": 1700,
      "holliday_ml": 1700,
      "restricted_ml": 1700,
      "restriction_percent": 100
    }
  ]
}

Response

Field	Type	Description
`formula`	string	nice_ng29
`formula_expression`	string	Exact expression used
`weight_kg`	number	Normalized weight in kg
`sex`	string	female or male
`restriction_percent`	integer	50, 80, or 100 (100 = no restriction)
`holliday_ml`	number	Holliday–Segar daily maintenance water in mL before the 1.4.1 cap
`capped_ml`	number	min(holliday_ml, 2500 if male else 2000) from NICE NG29 1.4.1
`restricted_ml`	number	capped_ml * restriction_percent / 100 from NICE NG29 1.4.9
`hourly_ml`	number	restricted_ml / 24, 1 decimal. Not the later 4-2-1 bedside rule.
`citation`	object	NICE NG29 2015 (updated 2020) citation
`disclaimer`	string	Not-a-device notice

Example JSON

Machine form of the same example. Frozen fixture. Not a live lookup.

{
  "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-ng29",
    "source": "NICE Guideline NG29. 2015 (updated 2020)",
    "title": "Intravenous fluid therapy in children and young people in hospital"
  },
  "formula": "nice_ng29",
  "formula_expression": "holliday_ml = 100*min(kg,10) + 50*max(0, min(kg,20)-10) + 20*max(0, kg-20); capped_ml = min(holliday_ml, male 2500 else 2000); restricted_ml = capped_ml * restriction_percent / 100; hourly_ml = restricted_ml / 24",
  "sex": "female",
  "weight_kg": 30.0,
  "hourly_ml": 70.8,
  "capped_ml": 1700,
  "holliday_ml": 1700,
  "restricted_ml": 1700,
  "restriction_percent": 100
}

Client errors (HTTP 400)

Invalid params return 400 without charge. Shared HTTP 402 and 503 meanings: Payments.

HTTP	Code	When
400	`invalid_nice_pediatric_iv`	NICE NG29 pediatric maintenance inputs must match Holliday-Segar weight, sex for the 2000/2500 mL cap, and restriction_percent 50, 80, or 100 from that guideline. Returned before settlement; you are not charged.
400	`invalid_items`	POST body must be a JSON object with only an items array Returned before settlement; you are not charged.
400	`invalid_item_count`	items must be an array of 1 to 25 objects Returned before settlement; you are not charged.
400	`invalid_item`	each items entry must be a JSON object Returned before settlement; you are not charged.

Related tools

Maintenance fluids — Compute Holliday–Segar 1957 daily maintenance water from weight, plus the corresponding hourly milliliters.
NICE adult IV maintenance — 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.
Parkland formula — 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.

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. Unpaid valid requests return HTTP 402 with a base64 PAYMENT-REQUIRED header. HTTP 503 is not a new quote: retry the same PAYMENT-SIGNATURE. Full handshake and shared payment errors: Payments. Stdio MCP: /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.