How high do your hcg levels have to be to get positive on a pregnancy test?

On a urine: Pregnancy test they can be anywhere from 10-100miu depending on the test used. Check this resource: http://www.Early-pregnancy-tests.Com/compare.Html.

Pregnancy test: Most pregnancy tests at the pharmacy are able to detect levels equivalent to a blood level of 20-25 miu/ml. This is very early in the process. Most patients won't have missed their menstrual cycles by the time the test is positive.