How frequently will you conduct blood test while patient is on regular clozapine?

Appeared in: AIIMS Delhi NO- 2019

Explanation

Patients initiating clozapine therapy must undergo weekly blood tests (CBC with differential) for the first 6 months.
This is a mandatory safety protocol to monitor for the risk of agranulocytosis, a potentially fatal decrease in neutrophils (a type of white blood cell).
The highest risk for developing agranulocytosis is within the first few months of treatment, which is why the monitoring is most intensive during this period.

Why Other Options Were Wrong

Option A: Twice a week monitoring is not a routine starting frequency. It is only initiated if a patient's blood counts (WBC or ANC) drop to a level of concern, requiring closer observation.
Option C: Monthly monitoring is only appropriate for patients who have been on clozapine for at least one full year with consistently stable and normal blood counts.
Option D: Fortnightly (every two weeks) monitoring is the step-down frequency after the initial intensive phase. It is not the starting frequency.

Related Visual

Clinical Relevance

Nursing practice connection: Use the key finding related to Pharmacology: Clozapine Monitoring Protocol to guide bedside assessment, documentation, and the next nursing action.
Nurses are central to the management of patients on clozapine. This includes enforcing the 'no blood, no drug' policy, where medication is not dispensed without a current, safe blood test result.
Patient education is a critical nursing role. The nurse must teach the patient and their family about the importance of regular blood tests and to immediately report any signs of infection, such as fever, sore throat, chills, or weakness.
What if? A stable patient on monthly monitoring calls to report a fever and a sore throat. The nurse's priority is to instruct the patient to go to the nearest emergency room or clinic for an urgent CBC test and to not take any more clozapine until cleared by their doctor. This could be a sign of delayed-onset agranulocytosis.

How to Approach the Question

First, identify the keyword in the question, which is 'clozapine'.
Recall the most critical and unique aspect of clozapine: its high risk of causing agranulocytosis.
Connect this high-risk side effect to the need for a strict and frequent blood monitoring protocol.
Evaluate the options based on the standard initiation protocol. The initial phase of treatment always has the most frequent monitoring.
Select 'Weekly' as it represents the standard of care for the first 6 months of clozapine therapy.

Concept Tested & Keywords

Concept Tested: Pharmacology: Clozapine Monitoring Protocol
Stem keywords: clozapine, blood test, frequency
Lead-in keywords: How frequently

Question ID

QlCy4IhVhJRlGqaBnj8cPv

Reference Book

E6 Robert Boland, Marcia L. Verduin - Kaplan and Sadock's Comprehensive Text of Psychiatry-Wolters Kluwer Health (2024) (pp 1-16525 of 16525) pp. 3489-3491, 3483-3485, 3490-3492

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