# A client who takes metformin is scheduled for a CT scan with iodinated contrast. Which information is most important for the nurse to verify before the procedure?

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=397163&lang=en  
> language: en  
> subject: Complications of Procedures  
> category: ROR

## Question

A client who takes metformin is scheduled for a CT scan with iodinated contrast. Which information is most important for the nurse to verify before the procedure?

## Option

1. Whether the client prefers morning appointments.
2. The client's current kidney function results. **✔ Correct answer**
3. The client's usual bedtime routine.
4. Whether the client has a family history of diabetes.

**Correct answer: 2**

## Explanation

Kidney function is important before iodinated contrast, especially for a client taking metformin, because impaired renal function increases risk for complications. Appointment preference and family history do not address the immediate procedure safety issue.

## In-depth explanation

Clinical Judgment
Use the client cues, timing, labs, and safety risks to select the response that best fits Metformin and iodinated contrast.

Memory Tip
Match the strongest cue cluster to the safest nursing judgment.

KR vs US
NCLEX items reward cue-based priority thinking rather than isolated recall.

## Clinical scenario

Clinical Practice Guide
For Metformin and iodinated contrast, compare the complete cue pattern with the client's current stability, ordered data, and expected nursing scope.

Caution
Do not choose an action from one isolated cue when the full scenario changes priority or safety.

## Key concepts

- **Iodinated Contrast** — A contrast agent used for some imaging studies that can affect kidney safety.
- **Metformin** — An oral medication used to treat type 2 diabetes.
- **Kidney Function** — Assessment of renal ability to filter and excrete waste or medications.

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