Mean Uterine Artery PI Calculator
Actual bilateral uterine-artery PIarithmetic mean with signed side discrepancy, not flow-weighted pooling, screening probability or universal threshold.
Description
Mean uterine-artery pulsatility index combines independently matched left and right measurements.
Mean uterine-artery pulsatility index combines independently matched left and right measurements.1
The bilateral mean and right-minus-left discrepancy describe different features.
When to use Mean Uterine Artery PI 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 Mean Uterine Artery PI Calculator and understand its results
- Establish the observation date, units, measurement context and independently applicable clinical reference or calibrated model.
- Enter independentlyMeasuredLeftUterinePi, independentlyMeasuredRightUterinePi, using the field meanings and rules below, then run the tool.
- Read result.observedBilateralMeanUterinePi, result.signedRightMinusLeftPi. 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 |
|---|---|---|---|
| independentlyMeasuredLeftUterinePi | Independently measured left uterine pi | number | Required |
| independentlyMeasuredRightUterinePi | Independently measured right uterine pi | number | Required |
Require nonnegative left and right PI values. Return their arithmetic mean and right-minus-left discrepancy without a normal-range assessment.
meanPI=(leftPI+rightPI)/2; discrepancyPI=rightPI−leftPI 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.observedBilateralMeanUterinePi | Observed Bilateral Mean Uterine Pi | number |
| result.signedRightMinusLeftPi | Signed Right Minus Left Pi; preserve the subtraction order and sign defined in the mechanics | number |
{
"input": {
"independentlyMeasuredLeftUterinePi": 1,
"independentlyMeasuredRightUterinePi": 2
},
"output": {
"result": {
"observedBilateralMeanUterinePi": 1.5,
"signedRightMinusLeftPi": 1
}
}
}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
-
Mean Uterine Artery PI 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.