Cerebroplacental Ratio Calculator
Cerebroplacental ratio using matched independently established MCA/umbilical artery PIs. Independently measured compatible definitions/units required; ratio is not a diagnosis, efficacy measure or safety/clinical threshold.
Description
The cerebroplacental ratio divides matched middle-cerebral-artery pulsatility index by umbilical-artery pulsatility index.
The cerebroplacental ratio divides matched middle-cerebral-artery pulsatility index by umbilical-artery pulsatility index.1
Acquisition context and the applicable reference remain necessary for interpretation.
When to use Cerebroplacental Ratio Calculator
Use this tool to calculate or review the supplied observations under the stated rules. Establish the observation date, units, measurement context and independently applicable clinical reference or calibrated model.
How to use Cerebroplacental Ratio Calculator and understand its results
- Establish the observation date, units, measurement context and independently applicable clinical reference or calibrated model.
- Enter independentlyMeasuredMcaPi, independentlyMatchedUmbilicalPi, using the field meanings and rules below, then run the tool.
- Read result.observedRatio. Use the units and sign conventions below.
- Correct any reported input issue and run again. Before using a successful result, check the stated units, signs, reference scope and observation coverage.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| independentlyMeasuredMcaPi | Independently measured mca pi | number | Required |
| independentlyMatchedUmbilicalPi | Independently matched umbilical pi | number | Required |
Supply a nonnegative independentlyMeasuredMcaPi and strictly positive independentlyMatchedUmbilicalPi. Divide the first by the second for a dimensionless ratio. The general ratio calculation does not clamp the result or require the numerator to be no greater than the denominator; a larger numerator can return above one. Establish matching observation scope and units independently.
observedRatio=1×independentlyMeasuredMcaPi/independentlyMatchedUmbilicalPi Use the matching field units and the exact boundary, ordering and reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Structured result; its nested fields below contain the actual calculation or selected reference | object |
| result.observedRatio | Observed Ratio; dimensionless ratio, without percent scaling | number |
{
"input": {
"independentlyMeasuredMcaPi": 2,
"independentlyMatchedUmbilicalPi": 4
},
"output": {
"result": {
"observedRatio": 0.5
}
}
}Limitations and assumptions
Dating evidence, acquisition conditions and applicable clinical references remain independently established. The output describes supplied observations or a conditional model without diagnosing an outcome, choosing a dose or verifying clinical applicability.
Missing required fields, unknown fields, wrong types and violated rules return input issues. Numeric values and outputs must be finite. Extremely large composite outputs are rejected.
Alternative or Complementary methods
For a related step, use Uterine Artery PI Calculator: Uterine-artery pulsatility index compares systolic-to-diastolic velocity excursion with a cycle-mean velocity. For a complementary comparison, use Umbilical Artery PI Calculator: Umbilical-artery pulsatility index expresses waveform velocity excursion relative to its cycle mean.
References
-
Cerebroplacental Ratio Calculator — tool.io
Similar or alternative tools
- Uterine Artery PI Calculator
Uterine-artery pulsatility index compares systolic-to-diastolic velocity excursion with a cycle-mean velocity.
- Umbilical Artery PI Calculator
Umbilical-artery pulsatility index expresses waveform velocity excursion relative to its cycle mean.