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These numbers are all used when talking about possible chronic kidney disease, which can happen with high blood pressure, diabetes, older age, and various other health issues. Renal insufficiency means that they are concerned about kidney problems. Age, race, health issues, will affect the "normal" range for these numbers for each individual, so your doctor will need to explain the range that is "normal" for your parent.
Here are explanations of what the acronyms/letters mean:
GFR is glomerular filtration rate. CR is creatinine level. BUN (not BUM) is Blood Urea Nitrogen.
Here is what the foundation says about these things..they have more info at www.kidney.org
Serum Creatinine: Creatinine is a waste product in your blood that comes from muscle activity. It is normally removed from your blood by your kidneys, but when kidney function slows down, the creatinine level rises. Your doctor should use the results of your serum creatinine test to calculate your GFR.

Glomerular Filtration Rate (GFR): Your GFR tells how much kidney function you have. It may be estimated from your blood level of creatinine. If your GFR falls below 30 you will need to see a kidney disease specialist (called a nephrologist), Your kidney doctor will speak to you about treatments for kidney failure like dialysis or kidney transplant. A GFR below 15 indicates that you need to start one of these treatments.

Blood Urea Nitrogen (BUN): Urea nitrogen is a normal waste product in your blood that comes from the breakdown of protein from the foods you eat and from your body metabolism. It is normally removed from your blood by your kidneys, but when kidney function slows down, the BUN level rises. BUN can also rise if you eat more protein, and it can fall if you eat less protein.

You can order pamphlets or search more info at their website.
helen
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