Mean Arterial Pressure & Pulse Pressure implementation

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

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