When a 24 hour urine collection is needed, patients should be told to urinate in the morning in the toilet first, then for the rest of the day collect the urine in the container. The next morning they should urinate into the container and bring the sample to the lab. The tests that are actually included in these groups varies from lab to lab. Electrolytes Sodium is an important ion that acts to preserve a balance between other ions such as calcium and potassium to maintain normal heart actions and equilibrium of the body. It also plays a role in the condition of nerve impulses.
Chloride is the predominant negative ion in plasma.
Electrolytes are ordered for a wide variety of reasons including kidney disease, dehydration, GI disease, heart disease, metabolic disease, etc. Creatinine is the end product of creatine metabolism and is excreted by the kidney. Liver Function Test Alkaline phosphates is an enzyme found in liver, bone, intestine and placenta that is increased with liver disease. Serum Glutamic-oxaloacetic Transaminase, is an exzyme found in many tissues, but in highest concentration in the liver and heart. Injury of either causes release of the enzyme into the blood.