The majority of guys, not based on what their age is, encounter this disorder at least once in their life. This blood test is often ordered within a patient's yearly physical exam to confirm how well their kidneys are functioning. This test can also be ordered every time a patient is acutely ill or when a doctor suspects kidney problems. The following symptoms often result in a doctor using a creatinine blood test: fatigue, loss in appetite, difficulty sleeping, concentration problems, decreased production of urine, trouble urinating, urinating more regularly, hypertension, pain in the mid-back, brown or foamy urine, blood inside urine, and swelling from the eyes, ankles, face, thighs, abdomen or wrists. These symptoms often indicate kidney dysfunction therefore this blood test will probably be performed to diagnose the challenge as well as to rule out kidney dysfunction because the cause.