When muscle mass remains unchanged, the creatinine level
s stay much the same – but if the kidneys are traumatized by injury or damaged through disease, they are unable to deal with this waste product, which means the <span style = 'background-color: #dae8f4'>level</span>s
time. High <span style = 'background-color: #dae8f4'>level</span>s
suggest kidney disease, muscle disease, urinary obstruction, hyperthyroidism, diabetes or arthritis.
In the case of chronic kidney disease, higher than normal BUN level
s and normal creatinine level
s suggest early onset of a problem.