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.
To convert BUN (Urea) from mmol/L to mg/dL, divide by 0.357 (or multiply by 2.8). To convert Creatinine from Âµmol/L to mg/dL, divide by 88.4. See Unit Conversion for more info and a calculator that will do the conversion for you.. Creatinine is the most specific test for kidney disease. When creatinine is elevated above the normal range (usually about 1.6 mg/dL, or 141 Âµmol/L), this generally means that there is a problem with the kidneys.