What Is Does "ng/ml" Mean?

The blood level of prostate-specific antigen, a protein produced by the prostate gland is also measured in nanograms per milliliter. This is also the case when checking the amount of vitamin D in the blood.

When drug tests are conducted, the unit of measurement is sometimes in ng/ml. For example, in a marijuana drug test, marijuana metabolites in the blood are measured in nanograms per milliliter.