Source: https://guthlabs.ai/docs/instruments/mean-arterial-pressure-pulse-pressure/implementation/

instrument implementation / implementation-contract

# Mean Arterial Pressure & Pulse Pressure implementation

A source-bound implementation contract for Mean Arterial Pressure & Pulse Pressure; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-clean

**Evidence ID**: t5-013

**Effect**: Computation or source lookup only

## Input and validation requirements

Extreme finite-number inputs overflow the plain-JavaScript subtraction to Infinity, and zero or reversed/nonphysical pressures can produce arithmetic outputs even though they should be rejected. Category behavior for invalid values is not defined by the specification.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "systolic": 118,
    "diastolic": 76,
    "unit": "mmHg"
  },
  "expected_outputs": {
    "MAP": 90,
    "PP": 42,
    "category_label": "Normal (assuming standard adult AHA thresholds)"
  },
  "working": "PP = SBP − DBP = 118 − 76 = 42 mmHg. MAP = DBP + (SBP − DBP)/3 = 76 + (118 − 76)/3 = 76 + 42/3 = 76 + 14 = 90 mmHg. Both SBP 118 and DBP 76 are below the normal-category boundaries, so the assumed AHA label is Normal."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/mean-arterial-pressure-pulse-pressure/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/mean-arterial-pressure-pulse-pressure/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/mean-arterial-pressure-pulse-pressure/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `evidence-tranche5/tranche5-results.json`