A nurse is reviewing laboratory values of a client who has severe dyspnea. Which of the following laboratory values indicates heart failure?

The correct answer is Choice A.

Choice A rationale: A clear liquid diet 1 to 3 days before a colonoscopy minimizes residue in the colon, enhancing mucosal visualization and reducing the risk of missed lesions. Clear liquids include water, broth, tea, and gelatin, which are easily absorbed and leave minimal waste. This dietary preparation complements bowel cleansing agents like polyethylene glycol. Inadequate preparation can obscure polyps or inflammation. Normal stool consistency should be absent during the procedure to ensure optimal diagnostic accuracy.

Choice B rationale: Polypectomy is typically performed during the colonoscopy itself if polyps are detected. Most polyps are removed using snares or biopsy forceps during the same session, reducing the need for a second procedure. Scheduling another procedure is reserved for complex or large lesions requiring advanced techniques. Delaying removal increases the risk of progression to malignancy. Normal colonoscopy findings include pink mucosa and absence of polyps; any deviation warrants immediate intervention when feasible.

Choice C rationale: Restricting intake to only water for 12 hours before the procedure is insufficient and potentially misleading. Colonoscopy preparation requires both dietary modification and pharmacologic bowel cleansing, not just fasting. Water alone does not clear the colon of fecal matter. Additionally, fasting without electrolyte replacement may lead to dehydration and electrolyte imbalance. Normal serum potassium ranges from 3.5 to 5.0 mEq/L; inadequate preparation may cause hypokalemia, especially with laxative use.

Choice D rationale: Enemas are not routinely recommended 2 days before colonoscopy. They may be used adjunctively on the day of the procedure for distal colon cleansing but are insufficient for full bowel preparation. Oral bowel prep agents like polyethylene glycol are preferred for complete evacuation. Enemas only reach the rectosigmoid region and do not cleanse the ascending or transverse colon. Incomplete prep compromises mucosal visualization and diagnostic yield, increasing false-negative rates.

Fluid overload is a potential complication of blood transfusion, and dyspnea is one of the hallmarks of fluid overload. Other signs and symptoms of fluid overload include a headache, hypertension, jugular vein distention, rapid breathing, and tachycardia.

An explanation for incorrect choices:

B. Fever is generally not associated with fluid overload but can be a sign of an adverse reaction to the blood transfusion, such as a febrile non-hemolytic transfusion reaction.

C. Pruritus is typically not associated with fluid overload but can be a sign of an adverse reaction to the blood transfusion, such as an allergic reaction.

D. Bradycardia is not typically associatedwith fluid overload but can be a sign of an adverse reaction to the blood transfusion, such as a hemolytic transfusion reaction.