What does it mean when the oil light comes on?   The oil light in a car indicates a lack of oil pressure. Typically this means that your motor oil level is low. It can also indicate a leak--head gasket or a cracked engâ¦ine block are two of the most common sources.
The kidneys maintain the blood creatinine in a normal range. Creatinine has been found to be a fairly reliable indicator of kidney function. Elevated creatinine level signifies impaired kidney function or kidney disease. As the kidneys become impaired for any reason, the creatinine level in the blood will rise due to poor clearance of creatinine by the kidneys. Abnormally high levels of creatinine thus warn of possible malfunction or failure of the kidneys.
Creatinine in the blood increases with muscle mass, so men often have higher creatinine levels than women, the Mayo Clinic explains. A high serum creatinine level means your kidneys arenât working well. So if your number is high, your doctor will order a GFR to see how much kidney function you have left. GFR may also be estimated from your blood level of creatinine. If your GFR falls below 30 you will need to see a kidney disease specialist (a nephrologist).