Results from Down syndrome blood test

Sandra • Tue, Dec 02

My risk came back as 1:5000 which is awesome but my hcg came back as 90.5 IU/ml I thought my hcg should be higher but then I was reading that a high hcg level indicates a higher chance of Down syndrome. I'll be 17 weeks on Wednesday. So I was just wondering if anyone knows what their hcg level was at 16 weeks and what the different between IU and ml is.

Thank you!!!