Individual tests

Your muscle tissue and red blood cells produce lactic acid, which rises in level as oxygen decreases. A lactic acid test can help diagnose lactic acidosis, find out if enough oxygen is reaching the body's tissues, and diagnose sepsis, a life-threatening reaction to bacterial infection.
During serious bacterial infection, the cells in many parts of your body release procalcitonin into your bloodstream. A high procalcitonin level in your blood may indicate a serious infection or sepsis. This test helps diagnose or rule out bacterial infection and/or sepsis, determining how serious the infection may be and helping with treatment decisions and monitoring treatment effectiveness.
Rheumatoid factors are proteins that sometimes mistakenly attack healthy cells and tissues in your body. Not everyone has rheumatoid factors in their blood. If you have high levels of rheumatoid factors, you may have rheumatoid arthritis. This disease can damage your joints and cause pain, swelling, and stiffness. It is a chronic (long-lasting) condition that can affect your organs and cause other symptoms.
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