Occult blood in stool is impossible to see with the naked eye and requires a fecal occult test that detects hidden blood in feces sample, according to WebMD. Sometimes people can see blood in their stool, however. More » Health Conditions & Diseases

Occult blood in a urinalysis may signal a urinary infection, kidney or bladder stones, kidney trauma or a prostate infection, according to the Urology Care Foundation. Blood in urine could also result from a tough workou... More » Health Pain & Symptoms

Fecal occult blood is small amounts of blood hidden in the feces, notes Mayo Clinic. Tests for fecal blood are done to see if there is blood loss in the gastrointestinal tract, which stretches from the mouth to the colon... More » Health Diagnostics & Imaging
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A rheumatoid arthritis blood test may determine the concentration of rheumatoid factors that a patient has in his blood, as stated by WebMD. One common blood test for rheumatoid arthritis is the rheumatoid factor test. More » Health Conditions & Diseases

Clostridium difficile is very contagious because the spores, which are found in the feces, are capable of living on dry surfaces for an extended time, according to WebMD. Another person can become infected with Clostridi... More » Health Conditions & Diseases

To use a colon test kit, follow any dietary restrictions for three days before beginning the test, collect a stool sample using an enclosed collection stick, and apply it to the test card, according to the American Cance... More » Health Diagnostics & Imaging

Testing for candida is accomplished by participating in either a saliva test, blood test, vaginal swabs or stool samples, according to the Cambridge Nutritional Sciences Ltd. The Candida Support organization also offers ... More » Health Conditions & Diseases