What is does "ng/ml" mean?

Ng/ml stands for nanograms per milliliter. This unit of measurement is often used for lab test results. For example, results of lab tests taken to check the levels of progesterone in the human blood are measured in nanograms per milliliter.

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.