The crohn’s disease activity index (cdai) calculator works out weight from the values you supply. Enter current weight, current hematocrit, ideal weight, number of liquid stools (last 7 days), hematocrit, complaints, cdai score, and the calculator applies the standard relationship straight away, so you get the answer without working through the algebra yourself.
What Is the Crohn's Disease Activity Index (CDAI) Calculator?
It is built around weight, and it works the same way whether you are checking a homework answer, confirming a colleague's figure, or working something out for yourself. Everything runs in your browser, so nothing you enter is uploaded anywhere.
How the Crohn's Disease Activity Index (CDAI) Calculation Works
The calculator works through the relationship one step at a time, so a change in any input flows straight through to the result.
The relationship between current weight, current hematocrit, ideal weight, number of liquid stools (last 7 days), hematocrit, complaints, cdai score and weight is fixed, so the same figures always give the same answer. That makes it a good cross-check: run the numbers a second way and see whether the result agrees.
Getting a Result You Can Trust
Start with a set of figures you are confident about. If one of the current weight or current hematocrit or ideal weight or number of liquid stools (last 7 days) or hematocrit or complaints or cdai score values looks wrong, the result will be wrong too, because everything downstream is built on top of it. Work through the outputs one at a time and check that each one is the size you would expect before relying on the last figure.
Frequently Asked Questions
What do I need to work out weight?
Enter current weight, current hematocrit, ideal weight, number of liquid stools (last 7 days), hematocrit, complaints, cdai score. The calculator then works through the relationship and reports weight.
What does the crohn's disease activity index (cdai) actually calculate?
It takes current weight and current hematocrit and ideal weight and number of liquid stools (last 7 days) and hematocrit and complaints and cdai score and converts them into weight 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 current weight?
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.
Why does a small change in one value move the answer so much?
That happens when an output depends on a ratio, because dividing by a small number magnifies any change in it. Check the units first, then check whether the value you entered is in the range the relationship was designed for.
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.