A patient with suspected diagnosis "progressing muscular dystrophy" got his urine tested. What compound will confirm this diagnosis if found in urine?

Answer options

1. Kreatine
2. Porphyrin
3. Calmodulin
4. Myoglobin
5. Collagen

Explanation

Creatine phosphokinase (a.k.a., creatine kinase, CPK, or CK) is an enzyme found in the heart, brain, and skeletal muscles. When muscle tissue is damaged (like muscular dystrophy), CPK (Creatine) leaks into the blood. Therefore, high levels of CPK usually indicate some sort of stress or injury to the heart or other muscles (Duchenne's dystrophy).