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.
Menopause comes next, the end of your menstrual periods. After a full year without a period, you can say you have been âthrough menopause,â and perimenopause is over. Postmenopause follows perimenopause and lasts the rest of your life. The average age of a woman having her last period, menopause, is 51.But, some women have their last period in their forties, and some have it later in their fifties. Smoking can lead to early menopause. So can some types of operations.enopause comes next, the end of your menstrual periods. After a full year without a period, you can say you have been âthrough menopause,â and perimenopause is over. Postmenopause follows perimenopause and lasts the rest of your life. The average age of a woman having her last period, menopause, is 51.