For this telescope, the lenses are a concave convex (one side curved out and the other curved in) and a plano concave (one flat side and one side curved in). The plano concave lens is used as the eyepiece with the plano (flat) side facing the eye.
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.
What is the normal level of BUN? Normal BUN levels differ with age and gender. A healthy male adult must have BUN levels from 8 to 24 mg/dL, while a healthy female adult should have it from 6 to 21mg/dL. The normal BUN levels for children fall between 5 and 18 mg/dL. Meanwhile, the healthy BUN level for pregnant women is from 5 to 12 mg/dL. The normal BUN levels for children and women are relatively low due to their bodiesâ ability to split up protein molecules. Oftentimes, the BUN test is done together with the Creatinine test to figure out renal problems.