Brief Answer:
Colonoscopy preperation depletes gut flora.

Detailed Answer:

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polyethylene glycol-electrolyte solution is used to empty the colon. PEG-ES is in a class of medications called osmotic laxatives. It works by causing watery diarrhea so that -the stool can be emptied from the colon.This depletes the gut flora causing problems like loose stool frequent defecation gas etc.
The most plentiful and importantbacteria in the small intestine is the Lactobacillus species. Lactobacillus helpsferment indigestible carbohydrates and, supports the breakdown of sugars in dairy products.The gut flora helps to neutralise some of the toxic by-products of digestion, reduce harmful substances (such as toxins and carcinogens), and discourage 'bad' bacteriaand yeasts. It also helps to stimulate the digestive process and aid the absorption of nutrients, as well as producing vitamins including B and K.As they are destroyed diring colonoscopy probiotics should be taken after the procedure.Probiotics are live bacteria and yeasts that are good for your health, especially yourdigestive system. We usually think of bacteria as something that causes diseases. But your body is full of bacteria, both good and bad. Probiotics are often called "good" or "helpful" bacteria because they help keep your gut healthy.

suggestion-
Consume probiotic foods. This may include specific types of yogurt or supplements that help combat invasive bacteria in the gastrointestinal tract.
Eat fruits and vegetables. The added fiber will help cleanse the colon.
Take Econorm sachets three times a day.
Iron test to be done are-
Serum ferritin
Transferin saturation
Total iron binding capacity
Hemoglobin

No stool test has already been done and is negative for blood.
Hope i was helpful.
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