{
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  "category": "other",
  "question": "Using the Holliday-Segar general rule of thumb, what is the estimated daily fluid need for a person weighing 70 kg?",
  "answer": "2500 mL/day",
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  "madeAt": "2026-09-30T22:39:30.722Z",
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  "sources": [
    {
      "label": "Original publication of the Holliday-Segar maintenance fluid rule",
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  ],
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  "source": {
    "kind": "edition_page",
    "value": "Holliday MA, Segar WE. The maintenance need for water in parenteral fluid therapy. Pediatrics. 1957;19(5):823-832.",
    "retrieved_utc": "2026-09-30T19:45:00Z"
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  "method": {
    "name": "Daily fluid estimate by weight (Holliday-Segar)",
    "version": "1",
    "source_url_or_file": "methods/hydration-estimate-by-weight.cjs",
    "sha256_of_method_file": "cb59dd26280347781902e4b73565cb18ced99aa510310dd11b42a99ec0ce3324"
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  "method_deck": {
    "inputs": [
      {
        "name": "weight_kg",
        "type": "number",
        "unit": "kg",
        "required": true,
        "description": "Body weight in kilograms",
        "min": 0
      }
    ],
    "outputs": [
      {
        "name": "daily_fluid_ml",
        "unit": "mL/day",
        "description": "Estimated daily maintenance fluid volume"
      }
    ],
    "steps": [
      "This is a general rule of thumb, not a personalized prescription.",
      "For the first 10 kg of weight: 100 mL/kg/day.",
      "For the next 10 kg (weight from 10 to 20 kg): 50 mL/kg/day.",
      "For weight above 20 kg: 20 mL/kg/day.",
      "Sum the three tiers that apply and round to the nearest whole mL/day."
    ],
    "constants": [
      {
        "name": "tier1_upper_kg",
        "value": 10,
        "unit": "kg",
        "source": 0
      },
      {
        "name": "tier1_rate",
        "value": 100,
        "unit": "mL/kg/day",
        "source": 0
      },
      {
        "name": "tier2_upper_kg",
        "value": 20,
        "unit": "kg",
        "source": 0
      },
      {
        "name": "tier2_rate",
        "value": 50,
        "unit": "mL/kg/day",
        "source": 0
      },
      {
        "name": "tier3_rate",
        "value": 20,
        "unit": "mL/kg/day",
        "source": 0
      }
    ],
    "examples": [
      {
        "name": "worked example",
        "inputs": {
          "weight_kg": 70
        },
        "expected": {
          "answer": "2500 mL/day"
        },
        "check": "First 10 kg: 10*100=1000. Next 10 kg: 10*50=500. Remaining 50 kg: 50*20=1000. Total = 1000+500+1000 = 2500."
      },
      {
        "name": "test vector: small child weight",
        "inputs": {
          "weight_kg": 8
        },
        "expected": {
          "answer": "800 mL/day"
        },
        "check": "Only tier 1 applies: 8*100 = 800."
      }
    ],
    "disclaimer": "General formula only. Not medical advice. Dosing decisions belong to a licensed clinician and the product's label.",
    "deck_category": "health"
  },
  "status": "minted",
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          "value": "Holliday MA, Segar WE. The maintenance need for water in parenteral fluid therapy. Pediatrics. 1957;19(5):823-832.",
          "retrieved_utc": "2026-09-30T19:45:00Z"
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        "added_by": "method:Daily fluid estimate by weight (Holliday-Segar)",
        "why": "the method that computed this answer",
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}