Ng/ml stands for nanograms per millilitre. This unit is often used to report the results of lab tests. For example, the amount of progesterone in a person’s blood is measured in nanograms per millilitre when a lab test is done.
Also measured in nanograms per millilitre is the amount of prostate-specific antigen in the blood. This is a protein made by the prostate gland. When checking the amount of vitamin D in the blood, this is also the case.
When drug tests are done, ng/ml is sometimes used as the unit of measurement. For example, nanograms per millilitre are used to measure the amount of marijuana metabolites in the blood during a drug test for marijuana.