The blood tests Reid orders for Liz Meyers are a Partial Thromboplastin Time and an Activated Partial Thromboplastin time, which are both tests done to determine blood clotting factors, namely the amount of time it takes for the blood to begin to clot. He then orders a Fibrin degradation product test which is used to determine the amount of time it takes for a blood clot to be dissolved by the body, which is what happens when a scab over a abrasion or puncture wound is broken down before being covered by scar tissue. The Creatine kinase test is to determine if there is any muscle damage in the body, like in the case of myocardial infarction (heart attack), rhabdomyolysis (severe muscle breakdown which could be due to muscle atrophy from being confined), muscular dystrophy and acute kidney injury. The P.O. 4 test is testing for phosphate levels in the blood which would be used to determine if there is a vitamin or mineral deficiency and can be a indication of how recently a person has eaten.