HCG is your pregnancy hormone. MIU is how much hormone is in your blood. MIU stands for "million international units", so HCG per MIU means how much of the hormone is in each million international units per your blood.
I hope this makes sense. In simply means that, for example, if your HCG is 232, it means that for every million units in your blood, there is 232 units of pregnancy hormone, HCG. This is why it is read as "232/mIU". Make sense?
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