Individual tests

Our bones are continually being remodeled in a two-step process: the “breakdown” of bone (resorption) and the replacement of the removed bone (formation). In osteoporosis, the bones are weakened because the breakdown occurs faster than the rebuilding. When bone is resorbed, fragments of the bone collagen are released into the bloodstream. One of these fragments is called “C-telopeptide.” This test helps assess the loss of bone mass in cases of osteoporosis or other bone diseases such as Paget’s disease.
C-reactive protein (CRP) is a protein produced by the liver. Normally, you have low levels of C-reactive protein in your blood. Your liver releases more CRP into your bloodstream if you have inflammation. High levels of CRP indicate you have a serious health condition that's causing the inflammation.
Inflammation is your immune system's response to injury, infection, and certain cancers. It can also result from blood or immune system disorders. An erythrocyte sedimentation rate (ESR) is a blood test that identifies inflammation in your body.
The fecal occult blood test (FOBT) checks stool samples for hidden (occult) blood. Occult blood in the stool may indicate colon cancer or polyps in the colon or rectum — though not all cancers or polyps bleed. If blood is detected through a fecal occult blood test, additional tests such as a colonoscopy may help determine the source of the bleeding. The fecal occult blood test can only detect the presence or absence of blood — it can't determine what's causing the bleeding.
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.
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