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R: Yolk sacFrom: Andrea Corda (acord@tin.it)Fri Jan 29 11:56:40 1999
As for measuring the yolk sac,difference between inner and outer measurements can be quantified in about 1.5 mm.(i,e,:7 mm outer-outer equals 5.5 mm inner -inner) Leading edge method stands somewhere in between.Since Ed Lyons says that a yolk sac greater than 6 mm carries a troublesome prognosis, and the findings I have say that a 7 or greater mm diameter carry the same prognosis,I think we are saying the same.I did the outer-outer because this method allows me to perform a simple "rule of thumb" in the early days after conception (i.e.:2mm CRL,2 mm yolk:OK,3mm CRL,3mm yolk:OK,3mm CRL,7mm yolk:what about a trisomy 21?I cannot do this using the inner-inner method.Also,one should take into account the fact that some yolk sacs are not so round,but somehow elliptical,so you should calculate the mean of both diameters,not to mention those which have an irregular shape (which I think should not be taken into account at least for the moment).Shall we establish a common rule?Can everyone give his own suggestions?Should Terry keep the records,or Ed,in order to collect the data?Let me know what you think and let's get started! Andrea -----Messaggio originale----- Da: Joseph A Worrall MD RDMS <jworrall@alaska.net> A: Multiple recipients of list <ultrasound@talk.obgyn.net> Data: mercoledì 27 gennaio 1999 23.18 Oggetto: Re: Yolk sac
>Should we be measuring the yolk sac inner diameter or outer diameter? I
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