here is the issue. If you have labs that come in as paper fax and you scan it and attach it to the chart as imported item and classify as "lab" it will add to the denominator. So lets say you you got
100 paper labs on Fax that you scanned and put it as Lab
30 labs cames in through Lab interface
Now you complaince would be 30/130 (about 22%)
Now if you had classified those 100 paper lab reports as "others" while attaching to chart, your complaince would have been 30/30 = 100%