Hi fp, one of the websites I use to check meaning of my family blood tests says this about creatinine (personally I would zoom into the glucose/diabetes connection as musle degeneration can be association/symptom rather than the cause itself):
CREATININE Causes of Increased: Renal dysfunction (including obstruction) Congestive heart failure Starvation-dehydration Uncontrolled diabetes (can interfere with test) Muscle degeneration
Causes of Decreased: Muscle atrophy Liver disease Pregnancy
Creatinine and creatinine kinase (ck) are not the same thing! Elevated CK levels can be indicative of muscle disorders but better to have a chat with your GP or her consultant who can look at that in the context of her other results.