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Physiological AdaptationClear liquids + bowel cleanse

Colonoscopy PrepNCLEX cheat sheet

Colonoscopy preparation cleanses the bowel with diet changes and an oral laxative solution so the colon can be fully visualized during the procedure.

23 key facts 3 practice questions Reviewed Oct 2026
The 1-minute sheetCinnaRN

Prep

  • Clear liquids 24h before
  • PEG/GoLYTELY → bowel cleanse
  • NPO after midnight, signed consent

Avoid

  • NO red/purple liquids (mimic blood)
  • No solid food, no milk

After

  • Sedation → no drive, need escort
  • Cramping/gas normal, will pass

Report

  • Severe abd pain → perforation
  • Heavy rectal bleeding, fever, distension
Red flag to remember

Report severe abdominal pain, distension, rigidity, or rectal bleeding indicating bowel perforation.

Before you read

Test yourself first: 3 questions

Question 1 of 3

A client receiving a continuous heparin infusion suddenly develops hematuria, bruising, and a drop in blood pressure. After stopping the infusion, which medication does the nurse prepare to administer?

What is colonoscopy prep?

A clean colon improves polyp detection and the accuracy of the exam. Memory aid: clear liquids and clear effluent; no red or purple dyes.

Key points to remember

  • A clear liquid diet is started the day before, and the patient is NPO after midnight or as ordered before the procedure.
  • Red, purple, and orange-colored liquids are avoided because they can mimic blood and obscure the view.
  • The prep is complete when rectal output is clear, pale yellow, and free of solid stool.
  • Conscious (moderate) sedation is used, so the patient needs a responsible adult to drive them home.
  • Large-volume electrolyte solutions can cause fluid and electrolyte imbalances, especially in older adults.
  • Anticoagulants and antiplatelet agents are often held before the procedure per provider orders.

Nursing priorities

  1. Confirm informed consent and review held medications including anticoagulants and antidiabetic drugs.
  2. Instruct on the clear liquid diet, the laxative regimen, and avoidance of red and purple fluids.
  3. Monitor hydration, electrolytes, and tolerance of the bowel prep, especially in older adults.
  4. Verify a responsible adult is available to drive the patient home after sedation.
  5. After the procedure, monitor vital signs, return of sensation, and for abdominal distension.

Labs & values

Potassium:3.5-5.0 mEq/L
Sodium:135-145 mEq/L
Hemoglobin:12-18 g/dL
3.55.0mEq/L Normal

Patient teaching

  • Drink only clear liquids the day before and avoid red, purple, or orange-colored drinks.
  • Finish the entire bowel prep even if your stool is already running clear.
  • Arrange for an adult to drive you home because you will be sedated.
  • Some bloating, cramping, and gas after the test is normal as air is passed.
  • Report severe belly pain or heavy rectal bleeding after you go home.

Red flags: report now

  • Report severe abdominal pain, distension, rigidity, or rectal bleeding indicating bowel perforation.
  • Report signs of dehydration or electrolyte imbalance such as dizziness, palpitations, or weakness during prep.
  • Report fever or persistent bleeding after the procedure.
  • Never allow the patient to drive or make important decisions for the rest of the day after sedation.

References

Clinical references for this topic

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