If the beta HCG level is more than 1000 mIU/ml, and the doctor cannot see a pregnancy sac in the uterine cavity on vaginal ultrasound scan, then it's possible you have an ectopic pregnancy.. What are Normal Beta hCG Levels? March 17, 2014, By Kathryn Rally | 1 comment. The mIU/ml unit stands for milli-international units per milliliter. A positive pregnancy test looks for levels above 25 mIU/ml. As you can see from the chart, normal exists as a relative term.. Beta hCG levels in blood vary greatly, especially in early pregnancy. We covered all the important information, such as the normal beta hCG levels and what determines it. Read on to learn more.. mIU/mL, IU/L Similarly to LH, FSH and TSH, human chorionic gonadotropin (hCG) is a member of the glycoprotein family and consists of 2 subunits (α‐ and β‐chains) which are associated to the intact hormone.. . .