Nursing Foundation

Stool Specimen Collection: Normal and Abnormal Characteristics

Abnormal stool characteristics can indicate various health issues, such as tarry black stool suggesting upper gastrointestinal bleeding or clay-colored stool indicating a bile flow obstruction.

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“Learn the 5 essential steps for proper stool specimen collection to make sure correct laboratory results. Discover the characteristics of normal and abnormal stool.”

Introduction:
Stool specimen collection is a critical process in diagnosing gastrointestinal conditions and other health issues. Next the correct procedure ensures that the sample is uncontaminated and provides reliable results.

Stool Specimen Collection:

Method of Collecting Stool Specimen:

  • Container: Use waterproof disposable or wide-mouthed containers.
  • Procedure: The client passes stool in a clean bedpan. A small amount is transferred to the container using a stick or spatula, which is then discarded.
  • Tapeworm Examination: If checking for tapeworms, the entire stool is sent in a wide-mouthed glass jar.
  • Infants: Collect stool from the diaper and send it in a covered container.
  • Special Considerations: Make sure stool is not mixed with urine. A cleansing enema be used with saline or tap water if needed.

Characteristics of Normal Faeces:

  • Color: Light to dark brown due to bile pigments.
  • Odor: Pungent smell influenced by diet, bacterial flora, and medications.
  • Frequency: Typically 1-2 times per day, painless.
  • Consistency: Semisolid and well-formed in adults.
  • Quantity: Varies with diet, typically 4-5 ounces per day.
  • Composition: 30% water, with the rest comprising shed intestinal epithelium, bacteria, mucin, salts, and other materials.
  • Infants’ Stool: Dark green “meconium” at birth, turning yellow and soft by the end of the first week.

Characteristics of Abnormal Stool:

  • Color:
  • Tarry black: Indicates upper gastrointestinal bleeding (melena).
  • Clay-colored: Suggests bile flow obstruction.
  • Odor:
  • Foul smell: Part of melena and dysentery.
  • Strong smell: Resulting from a meat-rich diet.
  • Frequency:
  • Increased: Seen in diarrhea.
  • Decreased: Seen in constipation or low-residue diets.
  • Consistency and Form:
  • Hard stools: Seen in constipation.
  • Flattened/ribbon-like stools: Indicates bowel obstruction.
  • Appearance:
  • Fresh blood: Suggests bleeding piles, menstrual blood mixing, or bleeding from the large intestine, among other conditions.

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