Ammonia

Ammonia : used to help investigate the cause of changes in behavior and consciousness. It may be ordered, along with other tests such as glucose, electrolytes, and kidney and liver function tests, to help diagnose the cause of a coma of unknown origin or to help support the diagnosis of Reye's syndrome or hepatic encephalopathy caused by various liver diseases , since hepatic encephalopathy can be caused by the build-up of a variety of toxins in the blood and brain . An ammonia level may also be ordered to help detect and evaluate the severity of a urea cycle defect

Blood gases

 Blood gases

To determine if your lungs are functioning well enough to exchange oxygen and carbon dioxide if you are having symptoms of a respiratory problem; to determine if you have an imbalance in the amount of oxygen gas (O2) or carbon dioxide gas (CO2) in your blood or an acid-base imbalanc

When you have difficulty breathing, shortness of breath, or rapid breathing; during certain surgeries to monitor your blood's oxygen and carbon dioxide levels

 

Lactate

high levels of lactate in the blood, which may be an indication of lack of oxygen (hypoxia )N^_^N
such as : rapid breathing, nausea, and sweating that suggest a lack of oxygen or an acid/base imbalance; when a person presents with what a doctor suspects is sepsis, shock, heart attack, severe congestive heart failure, renal failure, or uncontrolled diabetes 

CSF

To diagnose CSF : condition affecting the central nervous system

such as : bleeding within the brain or skull, cancer, autoimmune disorder or infection

collected : from the lower back