Re: yolk sac

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The upper limits of a normal yolk sac is 5 mm. Above 5 mm, the risk of abnormalities increases and above 5 is considered abnormal. I have never seen data on what percentage of pregnancies with yolk sacs above 5mm are abnormal though.

Good luck and good thoughts.

--
Harvey S. Marchbein, M.D. FACOG, FACS
Great Neck, New York

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