If the glomerulus — the part of the kidney that filters waste — is damaged or otherwise not working efficiently, people may have high levels of creatinine in the blood but low levels in the urine.

In general, there are two main types of cholesterol: Low-Density Lipoprotein (LDL) and High-Density Lipoprotein (HDL) cholesterol. High levels of LDL, also known as 'bad' cholesterol, can lead to ...