NG ml and nmol L are two different units of concentration, and the conversion between them requires knowing the molecular weight of the substance being measured. NG ml indicates the mass of the substance (in nanograms) contained in each milliliter of solution, while NMOL L indicates how many moles of the substance is contained in each liter of solution.
The conversion formula is as follows:
ng ml = (nmol l) molecular weight).
Or. nmol l = (ng ml) (molecular weight).
The implication of this formula is that you need to multiply NMOL L by the molecular weight of the substance to get ng ml and vice versa, to convert from ng ml to nmol l, you need to divide ng ml by the molecular weight of the substance.
For example, if you want to know how many nmol l is equivalent to 10 ng ml of a certain substance, assuming that the molecular weight of this substance is 300 g mol, then:
nmol l = (ng ml) (molecular weight).
nmol/l = 10 ng/ml ÷ 300 g/mol
nmol/l ≈ 0.0033 nmol/l
Note that the above calculations ignore factors such as the solubility of substances in water, partition coefficients, etc., so the influence of these factors may also need to be considered in practical applications.
For some specific substances, such as progesterone, there are fixed conversion factors that can be directly converted, such as:
ng/ml = nmol/l × 0.32
nmol/l = ng/ml ÷ 0.32 or nmol l = ng ml 3125
This is because these fixed conversion factors already take into account the molecular weight and other influencing factors of a particular substance.