MRI Without Contrast: Preparation Protocol
For most non-contrast MRI examinations, minimal patient preparation is required—patients typically need only to remove metallic objects, complete a safety screening questionnaire, and arrive in comfortable clothing without metal fasteners.
Standard Preparation Requirements
The preparation for non-contrast MRI is straightforward and generally includes:
Safety screening: Patients must complete an MRI safety questionnaire to identify contraindications such as:
- Cardiac pacemakers or implantable cardioverter-defibrillators
- Cochlear implants
- Certain metallic implants or foreign bodies
- Severe claustrophobia requiring sedation planning 1
Metal removal: All metallic objects (jewelry, watches, hairpins, hearing aids) must be removed before entering the scanner
Clothing: Patients should wear comfortable clothing without metal fasteners, zippers, or underwire bras
No fasting required: Unlike contrast-enhanced studies, fasting is generally not necessary for non-contrast MRI
Specific Protocol Considerations by Body Region
Brain/Head MRI
No special preparation beyond standard safety screening is needed. For pediatric patients with pituitary endocrinopathies (growth hormone deficiency, central precocious puberty, short stature), non-contrast protocols have shown high diagnostic yield, potentially reducing the need for sedation in young children 2.
Abdominal/Pelvic MRI
No bowel preparation or oral contrast is required for standard non-contrast abdominal MRI 3, 4. This differs significantly from MR enterography protocols, which require oral contrast agents for bowel distention.
For pregnant patients undergoing abdominal imaging, non-contrast MRI is particularly advantageous as it provides diagnostic information without radiation or gadolinium exposure 4, 5.
Musculoskeletal MRI
Standard preparation only. For pediatric lower extremity osteomyelitis evaluation, abbreviated non-contrast protocols (T1 without fat saturation, STIR, and axial T2 with fat saturation) have demonstrated 89-95% accuracy, potentially reducing sedation needs 6.
Important Caveats
Communicate contraindications in advance: The referring physician should inform the radiology department of any contraindications to MRI or specific patient needs (severe claustrophobia requiring sedation, inability to lie flat, pregnancy) to allow proper scheduling and protocol planning 1.
Prior imaging access: Radiologists should have access to previous imaging studies for comparison, as this significantly aids interpretation, particularly for equivocal findings 1.
Clinical context matters: The referral should include the suspected diagnosis and whether this is for initial diagnosis versus follow-up, as this influences protocol selection and interpretation 1.
Unlike contrast-enhanced MRI, there is no need for:
- Renal function assessment (creatinine/GFR)
- IV line placement
- Post-procedure observation period
- Restrictions on breastfeeding
The simplicity of non-contrast MRI preparation makes it particularly suitable for surveillance protocols, pediatric populations, and patients with renal insufficiency where gadolinium-based contrast agents pose risks 7, 8, 9.