How is diarrhea diagnosed?
Most cases of acute diarrhea never need diagnosis or treatment, as many are mild and produce few problems. But patients with fever over 102°F (38.9°C), signs of dehydration, bloody bowel movements, severe abdominal pain, known immune
disease, or prior use of antibiotics need prompt medical evaluation.
When diagnostic studies are needed, the most useful are stool culture and examination for parasites; however these are often negative and a cause cannot be found in a large number of patients. The earlier cultures are performed, the greater the chance of obtaining a positive result. For those with a history of antibiotic use in the preceding two months, stool samples need to be examined for the toxins that cause antibiotic-associated colitis. Tests are also available to check stool samples for microscopic amounts of blood and for cells that indicate severe inflammation of the colon. Examination with an endoscope is sometimes helpful in determining severity and extent of inflammation. Tests to check changes in blood chemistry (potassium, magnesium, etc.) and a complete blood count (CBC) are also often performed.
Chronic diarrhea is quite different, and most patients with this condition will receive some degree of testing. Many exams are the same as for an acute episode, as some infections and parasites cause both types of diarrhea. A careful history to evaluate medication use, dietary changes, family history of illnesses, and other symptoms is necessary. Key points in determining the seriousness of symptoms are weight loss of over 10 lb (4.5 kg), blood in the stool, and nocturnal diarrhea (symptoms that awaken the patient from sleep).
Both prescription and over-the-counter medications can contain additives, such as lactose and sorbitol, that will produce diarrhea in sensitive individuals. Review of allergies or skin changes may also point to a cause. Social history may indicate if stress is playing a role or identify activities which can be associated with diarrhea (for example, diarrhea that occurs in runners). A combination of stool, blood, and urine tests may be needed in the evaluation of chronic diarrhea; in addition a number of endoscopic and x-ray studies are frequently required. |
More information on diarrhea
What is diarrhea? - Diarrhea is a condition characterized by frequent bowel movements and feces that are soft or watery, and that may contain blood, pus, or mucus. Severe diarrhea in children can lead to dehydration and death.
What causes diarrhea? - Diarrhea may be caused by infections of the digestive system, medicines such as antibiotics, malabsorption, irritable bowel syndrome, or other factors.
What're the symptoms of diarrhea? - Diarrhea is characterized by frequent loose stools. Patients with diarrhea present with various clinical features depending on the underlying cause.
How is diarrhea diagnosed? - Most cases of acute diarrhea never need diagnosis or treatment. The most useful are stool culture and examination for parasites.
What're the treatments for diarrhea? - Treatment is ideally directed toward correcting the cause; however, the first aim should be to prevent or treat dehydration and nutritional deficiencies.
What's acute diarrhea? - Acute diarrhea is a disorder in which people develop loose stools and increased frequency of stools. Acute diarrhea lasts for a day or two and often stops as suddenly as it started.
Infant diarrhea prevention and treatment - Most acute diarrhea in infants and young children is due to viral gastroenteritis and is usually short-lived. Antibiotics are not routinely prescribed for viral gastroenteritis.
What are the causes of acute diarrhea? - The most common causes of acute diarrhea are infectious agents. Other important causes include food poisoning, medications, inflammatory or ischemic bowel disease.
What is chronic diarrhea? - Chronic diarrhea is defined as loose stool that persists for greater than 1 month. Chronic diarrhea is usually caused by a parasite.
What are the causes of chronic diarrhea? - Chronic diarrhea is frequently due to many of the same things that cause the shorter episodes (infections, medications, etc.).
What is traveler's diarrhea? - Traveler's diarrhea is a term used to describe the diarrhea caused by infection with bacteria, protozoa, or viruses ingested by consuming food or water that has been contaminated.
What are the causes of traveler's diarrhea? - Traveler's diarrhea may be caused by any of several bacteria, viruses, or parasites. Cooks and food handlers may have the germs that cause traveler's diarrhea.
What are the symptoms of traveler's diarrhea? - Nausea, vomiting, borborygmi, abdominal cramps, and diarrhea begin 12 to 72 h after ingesting contaminated food or water.
How is traveler's diarrhea diagnosed? - In some cases, a doctor might be able to identify the infecting organism, which could lead to a specific treatment.
What's the treatment for traveler's diarrhea? - Dehydration is the biggest danger of traveler's diarrhea. In most cases, diarrhea ends within three to five days without antibiotic treatment.
How to prevent traveler's diarrhea? - Many cases of traveler's diarrhea can be prevented. Travelers should dine at restaurants with a reputation for safety and avoid foods and beverages from street vendors. |
|
