CT Scan Preparation and Safety: What to Know Before Your Appointment

Overview

A CT scan, sometimes called a CAT scan, is an imaging test that uses X-rays and computer processing to create detailed images inside the body.

CT preparation can vary depending on the body area being scanned and whether contrast is needed.  Patient Prep (CT)

What You Need to Know

• CT scans usually require a valid requisition.
• CT scans generally need to be booked in advance.
• CT uses ionizing radiation.
• Tell the clinic if you are pregnant or might be pregnant.
• Some CT exams may involve contrast.
• Preparation instructions may vary depending on the type of CT scan.
• Do not guess about fasting, medications, diabetes instructions, or contrast safety.
• Follow the instructions given when your appointment is booked.

Before You Book

Make sure you have a valid requisition from your physician or authorized healthcare provider.

When booking, be ready to confirm:

• What type of CT scan was requested
• The body area being scanned
• Whether your requisition mentions contrast
• Whether you are pregnant or might be pregnant
• Any allergy history, especially if contrast may be used
• Any kidney-related concerns, if contrast may be used
• Whether you take diabetes medications
• Any mobility or accessibility needs

How to Prepare

CT preparation depends on the exam Patient Prep (CT)

You may receive instructions about:

• Whether to fast before the scan
• Whether you can drink water
• Whether to take regular medications
• Whether contrast will be used
• Whether bloodwork is needed before contrast
• What to wear
• When to arrive
• Whether someone can accompany you

Follow the specific preparation instructions provided by the clinic. If you did not receive instructions or are unsure, contact GNMI before your appointment.

Contrast Notes

Some CT scans may use contrast to help show blood vessels, organs, or tissues more clearly.

Before a contrast CT, patients may need to answer safety questions about allergies, kidney function, diabetes medications, pregnancy, breastfeeding, or prior reactions to contrast.

Do not assume contrast is required for every CT. The type of CT depends on the requisition and the clinical reason for the exam.

Safety Notes

CT uses ionizing radiation. The scan should only be performed when medically needed and ordered by an authorized healthcare provider.

Tell GNMI before your exam if:

• You are pregnant
• You might be pregnant
• You are breastfeeding
• You have had a previous reaction to contrast
• You have kidney disease or reduced kidney function
• You take diabetes medication
• You have allergies or other medical concerns
• You are unsure whether the test is safe for you

When to Contact GNMI

Contact GNMI before your CT appointment if:

• You did not receive preparation instructions
• You are unsure whether to fast
• You are unsure whether to take your medications
• Your requisition mentions contrast
• You have had a previous contrast reaction
• You have kidney concerns
• You are diabetic
• You are pregnant or might be pregnant
• You need accessibility support
• You need to confirm location availability