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.
The full transition to menopause can take four to 12 years. Menopause is the time of life when your periods stop, estrogen and progesterone production ends, and you can no longer become pregnant. During perimenopause, you might start experiencing symptoms such as hot flashes, insomnia, and fatigue.