Albumin creatinine ratio (ACR) is used to measure the level of functioning of the kidneys. The normal ratio should be around less than 30 mg/g of creatinine. It varies in men and women. In men, the level is <17 mg/g whereas in women, the level is around 25 mg/g.
If the ratio is a little bit high, that is, around 35 - 300 mg/g, it is known as microalbuminuria. It indicates that the kidneys may be slightly diseased.
If the ratio is more than 300 mg/g, it is known as macroalbuminuria. It indicates a severe kidney disease.