Kidney · LIVE

STONE nephrolithometry

Sum the Okhunov 2013 STONE nephrolithometry score for kidney calculi (PCNL) from five caller-assigned published item points and return the integer total (5–13). Does not return stone-free-rate bands.

LIVE $0.005 USDC GET /api/calc/stone_nephrolithometry

Markdown: /docs/stone-nephrolithometry.md · Canonical: https://magentlab.com/docs/stone-nephrolithometry

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

What it computes

When to use

When an agent has already assigned Okhunov 2013 size (mm²), tract length, hydronephrosis, involved calyces or staghorn, and Hounsfield-unit essence for renal calculi planned for PCNL and needs the published integer sum, not a PCNL order, CT read, or the ureteral STONE score.

When not to use

Not a medical device. magent does not measure stone size, tract, hydronephrosis, calyces, or HU. Size, tract, obstruction, calyces, and essence are caller-assigned.
Not an operative or PCNL order. The score is not a command to operate, place a tract, or choose a percutaneous approach.
Not the Moore 2014 ureteral STONE score. This tool is Okhunov 2013 STONE nephrolithometry for kidney calculi / PCNL.
Okhunov 2013 correlated score with stone-free rate but did not publish exclusive SFR cutoffs. magent returns score and max_score only.

Formula

STONE = size (0_399 1, 400_799 2, 800_1599 3, ge_1600 4) + tract (le_100 1, gt_100 2) + obstruction (none_or_mild 1, moderate_or_severe 2) + calyces (1_or_2 1, 3 2, staghorn 3) + essence (le_950 1, gt_950 2); Okhunov 2013 STONE nephrolithometry; sum 5-13; no published SFR bands

Citation

Title: S.T.O.N.E. nephrolithometry: novel surgical classification system for kidney calculi
Authors: Okhunov Z, Friedlander JI, George AK, Duty BD, Moreira DM, Srinivasan AK, Hillelsohn J, Smith AD, Okeke Z
Source: Urology. 2013;81(6):1154-1159
DOI: 10.1016/j.urology.2012.10.083

Worked example

All minimum grades

Given: calyces=1_or_2essence=le_950obstruction=none_or_mildsize=0_399tract=le_100

0_399 1 + le_100 1 + none_or_mild 1 + 1_or_2 1 + le_950 1
Score = 5 (max 13). No SFR band. Not a PCNL order

All maximum grades

Given: calyces=staghornessence=gt_950obstruction=moderate_or_severesize=ge_1600tract=gt_100

ge_1600 4 + gt_100 2 + moderate_or_severe 2 + staghorn 3 + gt_950 2
Score = 13 (max 13). No SFR band. Not a PCNL order

Also searched as

Okhunov STONE
STONE score renal calculi
PCNL nephrolithometry
STONE nephrolithometry
Okhunov 2013
renal STONE score
PCNL stone score
S.T.O.N.E. nephrolithometry

Try

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

/api/calc/stone_nephrolithometry?size=0_399&tract=le_100&obstruction=none_or_mild&calyces=1_or_2&essence=le_950

Full URL: https://api.magentlab.com/api/calc/stone_nephrolithometry?size=0_399&tract=le_100&obstruction=none_or_mild&calyces=1_or_2&essence=le_950

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/stone_nephrolithometry?size=0_399&tract=le_100&obstruction=none_or_mild&calyces=1_or_2&essence=le_950"

Parameters

Name	Type	Required	Description
`size`	string	required · 0_399, 400_799, 800_1599, ge_1600	Caller-assigned stone size in mm² (Okhunov 2013). 0_399 (0–399 mm²) scores 1; 400_799 (400–799 mm²) scores 2; 800_1599 (800–1599 mm²) scores 3; ge_1600 (≥1600 mm²) scores 4. magent does not measure stone size or CT.
`tract`	string	required · le_100, gt_100	Caller-assigned tract length in mm, skin-to-stone (Okhunov 2013). le_100 (≤100 mm) scores 1; gt_100 (>100 mm) scores 2. magent does not measure tract length or CT.
`obstruction`	string	required · none_or_mild, moderate_or_severe	Caller-assigned hydronephrosis / obstruction (Okhunov 2013). none_or_mild scores 1; moderate_or_severe scores 2. magent does not measure hydronephrosis or CT.
`calyces`	string	required · 1_or_2, 3, staghorn	Caller-assigned number of involved calyces or staghorn (Okhunov 2013). 1_or_2 scores 1; 3 scores 2; staghorn scores 3. magent does not count calyces or read CT.
`essence`	string	required · le_950, gt_950	Caller-assigned stone density in Hounsfield units (Okhunov 2013 essence). le_950 (≤950 HU) scores 1; gt_950 (>950 HU) scores 2. magent does not measure HU or CT.

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/stone_nephrolithometry 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": [
    {
      "calyces": "1_or_2",
      "essence": "le_950",
      "obstruction": "none_or_mild",
      "size": "0_399",
      "tract": "le_100"
    },
    {
      "calyces": "1_or_2",
      "essence": "le_950",
      "obstruction": "none_or_mild",
      "size": "0_399",
      "tract": "le_100"
    }
  ]
}

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/stone_nephrolithometry",
  "items": [
    {
      "size": "0_399",
      "components": [
        {
          "value": "0_399",
          "factor": "size",
          "points": 1,
          "present": true
        },
        {
          "value": "le_100",
          "factor": "tract",
          "points": 1,
          "present": true
        },
        {
          "value": "none_or_mild",
          "factor": "obstruction",
          "points": 1,
          "present": true
        },
        {
          "value": "1_or_2",
          "factor": "calyces",
          "points": 1,
          "present": true
        },
        {
          "value": "le_950",
          "factor": "essence",
          "points": 1,
          "present": true
        }
      ],
      "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": "Okhunov Z, Friedlander JI, George AK, Duty BD, Moreira DM, Srinivasan AK, Hillelsohn J, Smith AD, Okeke Z",
        "doi": "10.1016/j.urology.2012.10.083",
        "id": "okhunov-2013",
        "pmid": "23540858",
        "source": "Urology. 2013;81(6):1154-1159",
        "title": "S.T.O.N.E. nephrolithometry: novel surgical classification system for kidney calculi"
      },
      "formula": "stone_nephrolithometry",
      "formula_expression": "STONE = size (0_399 1, 400_799 2, 800_1599 3, ge_1600 4) + tract (le_100 1, gt_100 2) + obstruction (none_or_mild 1, moderate_or_severe 2) + calyces (1_or_2 1, 3 2, staghorn 3) + essence (le_950 1, gt_950 2); Okhunov 2013 STONE nephrolithometry; sum 5-13; no published SFR bands",
      "max_score": 13,
      "score": 5,
      "calyces": "1_or_2",
      "essence": "le_950",
      "obstruction": "none_or_mild",
      "tract": "le_100"
    },
    {
      "size": "0_399",
      "components": [
        {
          "value": "0_399",
          "factor": "size",
          "points": 1,
          "present": true
        },
        {
          "value": "le_100",
          "factor": "tract",
          "points": 1,
          "present": true
        },
        {
          "value": "none_or_mild",
          "factor": "obstruction",
          "points": 1,
          "present": true
        },
        {
          "value": "1_or_2",
          "factor": "calyces",
          "points": 1,
          "present": true
        },
        {
          "value": "le_950",
          "factor": "essence",
          "points": 1,
          "present": true
        }
      ],
      "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": "Okhunov Z, Friedlander JI, George AK, Duty BD, Moreira DM, Srinivasan AK, Hillelsohn J, Smith AD, Okeke Z",
        "doi": "10.1016/j.urology.2012.10.083",
        "id": "okhunov-2013",
        "pmid": "23540858",
        "source": "Urology. 2013;81(6):1154-1159",
        "title": "S.T.O.N.E. nephrolithometry: novel surgical classification system for kidney calculi"
      },
      "formula": "stone_nephrolithometry",
      "formula_expression": "STONE = size (0_399 1, 400_799 2, 800_1599 3, ge_1600 4) + tract (le_100 1, gt_100 2) + obstruction (none_or_mild 1, moderate_or_severe 2) + calyces (1_or_2 1, 3 2, staghorn 3) + essence (le_950 1, gt_950 2); Okhunov 2013 STONE nephrolithometry; sum 5-13; no published SFR bands",
      "max_score": 13,
      "score": 5,
      "calyces": "1_or_2",
      "essence": "le_950",
      "obstruction": "none_or_mild",
      "tract": "le_100"
    }
  ]
}

Response

Field	Type	Description
`formula`	string	stone_nephrolithometry
`formula_expression`	string	Exact expression used
`score`	integer	Okhunov 2013 STONE nephrolithometry integer sum 5-13. Not a PCNL order. No published SFR band.
`max_score`	integer	13
`size`	string	Caller-assigned size used (0_399, 400_799, 800_1599, or ge_1600)
`tract`	string	Caller-assigned tract used (le_100 or gt_100)
`obstruction`	string	Caller-assigned obstruction used (none_or_mild or moderate_or_severe)
`calyces`	string	Caller-assigned calyces used (1_or_2, 3, or staghorn)
`essence`	string	Caller-assigned essence used (le_950 or gt_950)
`components`	array	Per-item Okhunov 2013 points
`citation`	object	Okhunov et al. Urology 2013 citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "size": "0_399",
  "components": [
    {
      "value": "0_399",
      "factor": "size",
      "points": 1,
      "present": true
    },
    {
      "value": "le_100",
      "factor": "tract",
      "points": 1,
      "present": true
    },
    {
      "value": "none_or_mild",
      "factor": "obstruction",
      "points": 1,
      "present": true
    },
    {
      "value": "1_or_2",
      "factor": "calyces",
      "points": 1,
      "present": true
    },
    {
      "value": "le_950",
      "factor": "essence",
      "points": 1,
      "present": true
    }
  ],
  "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": "Okhunov Z, Friedlander JI, George AK, Duty BD, Moreira DM, Srinivasan AK, Hillelsohn J, Smith AD, Okeke Z",
    "doi": "10.1016/j.urology.2012.10.083",
    "id": "okhunov-2013",
    "pmid": "23540858",
    "source": "Urology. 2013;81(6):1154-1159",
    "title": "S.T.O.N.E. nephrolithometry: novel surgical classification system for kidney calculi"
  },
  "formula": "stone_nephrolithometry",
  "formula_expression": "STONE = size (0_399 1, 400_799 2, 800_1599 3, ge_1600 4) + tract (le_100 1, gt_100 2) + obstruction (none_or_mild 1, moderate_or_severe 2) + calyces (1_or_2 1, 3 2, staghorn 3) + essence (le_950 1, gt_950 2); Okhunov 2013 STONE nephrolithometry; sum 5-13; no published SFR bands",
  "max_score": 13,
  "score": 5,
  "calyces": "1_or_2",
  "essence": "le_950",
  "obstruction": "none_or_mild",
  "tract": "le_100"
}

Client errors (HTTP 400)

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

HTTP	Code	When
400	`invalid_stone_nephrolithometry`	size must be 0_399, 400_799, 800_1599, or ge_1600; tract must be le_100 or gt_100; obstruction must be none_or_mild or moderate_or_severe; calyces must be 1_or_2, 3, or staghorn; essence must be le_950 or gt_950 (Okhunov 2013 STONE nephrolithometry). 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

Urine PCR — Compute the Ginsberg 1983 urine protein/creatinine ratio (mg/mg) from a single-void urine protein and urine creatinine, and return that rounded ratio as estimated_g_day (numeric estimate of 24-h protein g/day).

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.