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Re: Seeking for further studiesFrom: Allen Worrall (jworrall@alaska.net)Sun Aug 14 16:50:03 2005
I agree. In fact, even when an ultrasound machine and a reporting software say they are using the same table, I think there may be differences in interpolation when a measurement falls between one of the points listed in the table. Or perhaps it is the way the values are entered in the table. The reporting software I use (BABE) permits the user to enter tables. I do not know enough about statistics to even enter the tables correctly, or I will enter only the 50th percentile value (due to laziness) and not the 5th and 95th percentile value, and then I get some pretty weird percentiles for CRL or humerus length, for example. Actually it is a large amount of work to enter a complete table, one value at a time, without error. Some third party vendor should offer those tables in a form that can be entered or downloaded into one's reporting software just by a mouse click. Correct me if I am wrong, but I believe the Hadlock and Shepard fetal weight tables do NOT use HC, at least the tables that I use. So when I am asked to do a limited scan (76815) for EFW and AFI (fairly common request in the 3rd trimester) I may not do the HC. Am I wrong? Allen
> ----- Original Message ----- You stated that the two machines are using the "same hadlock measurement", but you are not getting the same result. Is that correct. By "same hadlock measurement" do you mean the outer abdominal circumference, femur length, BPD, & head circumference? Hadlock published several fetal weight estimates... are you sure the algorithms use the same Hadlock formula? You will need to look at the users manual for each machine to determine which Hadlock publication and which forumula is used. This is an interesting problem of sonography because there have been so many formulas published for the various parameters. Please let us know what you find. Thanks, Terry ebrillo@kingdomhospital.com wrote: i have a querry regarding the standard efw formula, how effective and accurate is efw for ob us how come if i use THE GE MACHINE we have here9GE 400/ge 700) I COULD GET EFW closed to weight the fetus when delivered but if i used envisor philipps there is a very big descrepancy more than 500 grams same hadlock measurement pls/kindly explain to me i even ask the engener of phillips
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