In medicine, the BUN-to-creatinine ratio is the ratio of two serum laboratory values, the blood urea nitrogen and serum creatinine. Outside the United States, particularly in Canada and Europe, the truncated term urea is used and the units are different. The units of creatinine are also different, and this value is termed the urea-to-creatinine ratio. The ratio may be used to determine the cause of acute kidney injury or dehydration. The principle behind this ratio is the fact that both urea and
Posted on 10/07/2010 | Comments (). Print. The average American woman enters menopause by age 51, but the hormone level shifts that trigger menopause can actually begin years, even decades earlier. Known as perimenopause, this condition can begin as early as age 35, and lasts anywhere from a few months to 10 years.Perimenopause vs. Menopause.osted on 10/07/2010 | Comments (). Print. The average American woman enters menopause by age 51, but the hormone level shifts that trigger menopause can actually begin years, even decades earlier. Known as perimenopause, this condition can begin as early as age 35, and lasts anywhere from a few months to 10 years.
Perimenopause is the stage in a woman's life leading up to menopause, and it can last for up to 10 years. It is said to begin when a woman experiences her first menopause symptom and ends after she has not menstruated for a full 12 consecutive months.