Normal values range from 0.4 - 4.0 milli-international units per liter (mIU/L). Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your doctor about the meaning of your specific test results.
The primary system also allows for absentee or early voting, while caucuses do not. The term covers a few different kinds of elections, though they all have ballots. While caucuses tend to be split between open and closed, there are several different kinds of primaries.
Today, 10 states hold caucuses. In most states that hold caucuses, the majority of delegates they choose support the same candidate, but the delegates sometimes are divided between two or more candidates. That can make the convention pretty interesting! Most states hold primary elections instead of caucuses.