A. BUN stands for blood urea nitrogen. Creatinine is a natural product of muscle breakdown that occurs at a low level in the body. Both BUN and creatinine are filtered by the kidney and excreted in urine. For this reason, BUN and creatinine are used together to measure kidney function.If kidney function begins to decline, BUN and creatinine rise. A normal creatinine depends on muscle mass and age. In general, a normal creatine is 0.5 to 1.2 milligrams per deciliter (mg/dL). A normal BUN is 7 to 20 mg/dL.Remember that different laboratories use different testing equipment, and may have slightly different ranges for normal.n cases of dehydration, BUN may increase in a higher proportion than the creatinine. A normal BUN-to-creatinine ratio is between 10 to 1 and 20 to 1. (For example, a BUN of 14 and a creatinine of 1.2 would be a ratio of 12.).
The two types of stars that end with supernovae are white dwarfs and massive stars that are at least eight times the mass of the sun. Each of these types of stars undergoes a thermonuclear reaction at the end of its life. Keep Learning.
Betelgeuse, one of the brightest stars in the sky, could burst into its supernova phase and become as bright as a full moon - and last for as long as a year. The massive star is visible in the winter sky over most of the world as a bright, reddish star, could explode as a supernova anytime within the next 100,000 years.