68 year old adult presented with constipation for 3 days is prescribed a glycerin suppository. What is the appropriate depth of insertion of the suppository in an adult?

1. A

   1 inch (2.5 cm)

2. B

   2 inch (5 cm)

3. C

   5 inch (12.5 cm)

4. D

   4 inches (10 cm)

Appeared in: NORCET 10 Prelims-2026

Explanation

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• The standard recommended depth for inserting a rectal suppository in an adult is 4 inches (10 cm).
• This depth ensures the suppository is advanced past the internal anal sphincter, which prevents it from being expelled.
• Placing the suppository against the rectal wall allows the medication (glycerin) to melt and exert its local osmotic and lubricant effect to relieve constipation.
• This technique, often equated to the length of an index finger, is a widely accepted nursing standard for adult patients.

Why Other Options Were Wrong

• Option A: An insertion depth of 1 inch (2.5 cm) is generally considered too shallow for an adult. It may not place the suppository fully past the internal anal sphincter, increasing the risk of it being expelled before it can dissolve and take effect.
• Option B: A depth of 2 inches (5 cm) is the standard guideline for administering rectal suppositories to infants and children, not adults. Using this depth in an adult might be insufficient.
• Option C: An insertion depth of 5 inches (12.5 cm) is excessive and unnecessary. The adult rectum is typically about 5-6 inches long, and inserting a suppository this deep risks placing it into the sigmoid colon, which is not the intended site of action for a local-acting suppository and provides no additional benefit.

Related Visual

• Visual 1: Diagram - An anatomical illustration showing a sagittal view of the rectum and anal canal. An arrow should indicate the correct insertion path and final placement of the suppository at 10 cm (4 inches), past the internal anal sphincter and against the rectal wall.
• Visual 2: Infographic - A step-by-step guide to administering a rectal suppository, including patient positioning (Sim's position), lubrication, the insertion technique with depth markers for adults vs. children, and post-procedure instructions.

Clinical Relevance

• Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain The concept tested is the correct procedural technique for administering a rectal suppository to an adult patient, specifically the required depth of insertion for safety and efficacy as background academic context rather than a clinical decision trigger.
• Correct administration technique is fundamental to medication safety and effectiveness. Improper insertion can lead to treatment failure, patient discomfort, and potential complications like expulsion of the medication or local trauma.
• Patient education is a key nursing responsibility. The nurse must explain the procedure to alleviate anxiety and ensure the patient can remain still and relaxed, which facilitates easier insertion.
• What if? If the patient reports severe rectal pain or has active rectal bleeding, the nurse should withhold the suppository and notify the healthcare provider. These could be signs of a more serious condition (e.g., fissure, thrombosed hemorrhoid, or rectal injury), and inserting a suppository could cause further harm.

How to Approach the Question

• First, identify the key elements of the question: the medication is a rectal suppository, the patient is an adult, and the question asks for the correct insertion depth.
• Recall standard nursing procedures for medication administration via different routes.
• Differentiate between the guidelines for adult and pediatric patients. The question specifies a 68-year-old adult, so pediatric rules do not apply.
• Evaluate the given options based on standard textbook values for an adult.
• Eliminate 2 inches (5 cm) as it is the standard for children.
• Eliminate 1 inch (2.5 cm) as it may be too shallow to pass the sphincter and prevent expulsion.

Concept Tested & Keywords

• Concept Tested: The concept tested is the correct procedural technique for administering a rectal suppository to an adult patient, specifically the required depth of insertion for safety and efficacy.
• Stem keywords: 68 year old adult, constipation, glycerin suppository, depth of insertion
• Lead-in keywords: appropriate depth
• Clinical cues: The patient is an adult (68 years old), which is a key factor in determining the correct insertion depth, as it differs from the pediatric guideline.

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