The mca perinatology calculator works out mom from median peak systolic velocity, median peak systolic velocity, mca peak systolic velocity, mca peak systolic velocity and one way. Enter what you have and the relationship is applied straight away, so you get the answer without working through the algebra yourself.
What Is the MCA Perinatology Calculator?
The mca perinatology calculator gives you an estimate of mom based on median peak systolic velocity, median peak systolic velocity, mca peak systolic velocity, mca peak systolic velocity and one way.
It is a quick reference figure rather than a diagnosis, and it is most useful for tracking how a number moves over time rather than for interpreting a single reading.
How the MCA Perinatology Estimate Is Worked Out
The calculation follows published reference relationships, so it is a reasonable approximation when the inputs are accurate. It assumes an average adult and does not account for individual variation.
If you are comparing two people, or the same person over a period of weeks, keep the method and the inputs identical. A change in the method can easily look like a change in the person.
What This Calculator Does Not Do
It does not diagnose anything, and it does not replace advice from a clinician. If a figure comes out at an extreme, or if it differs sharply from what you expect, that is a reason to speak to a professional rather than to adjust the inputs.
Nothing you type here is stored or sent anywhere. The whole calculation happens in your browser.
A Worked Example
Working through an example, with median peak systolic velocity set to 10, median peak systolic velocity set to 5, mca peak systolic velocity set to 2, the calculator returns mom of 0.2, and mom (mom twin) of 20. Substitute your own figures and the same steps produce the same kind of answer.
Frequently Asked Questions
What do I need to work out mom?
Enter median peak systolic velocity, median peak systolic velocity, mca peak systolic velocity, mca peak systolic velocity and one way. The calculator then works through the relationship and reports mom.
What does the mca perinatology actually calculate?
It takes median peak systolic velocity, median peak systolic velocity, mca peak systolic velocity, mca peak systolic velocity and one way and converts them into mom using the standard relationship for this problem. Each step is applied in turn, so every output is traceable back to the numbers you typed in.
How should I enter median peak systolic velocity?
Use the value you actually have, in the unit shown next to the field. Enter every value in the same unit system. The calculator assumes the figures you supply are consistent, so it cannot correct a mistake that happens before the calculation starts.
Can I use this for a quick estimate as well as a precise answer?
Yes. The calculator is built for quick checks, so round your inputs to a sensible number of significant figures and the result will be just as useful. If you need more precision, keep the same method and add digits to the inputs rather than adjusting the method itself.
Is the answer exact?
It is as exact as the formula and the inputs allow. The method itself is the standard one for this problem, so the only sources of error are the figures you enter and the precision you ask for.