Serum Muscle Enzymes - the blood can be tested to look for abnormal values of these substances, which are produced when muscle has been damaged.
Urinary Electrolyte Testing - Can be used to detect electrolyte abnormalities, which can predispose to the disease and it can also be used to monitor management and treatment.
Urinary Testing - like the blood, the urine can be tested for products associated with the breakdown of muscle tissue.
Muscle biopsy - this involves a small sample of muscle which is removed under local anaesthesia and sedation and examined under the microscope for abnormalities.
do bear in mind EPSM show similar signs to tying up but won't show up on blood tests, the only way is a muscle biopsy! I had mine sent to the states for testing