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Preparation for Radiological Examinations

Proper preparation improves image quality, reduces the need for repeat exams and lowers complication risk.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Radyoloji department. Book Appointment →

What is Preparation for Radiological Examinations?

Preparation for radiological examinations optimizes image quality, prevents contrast complications and ensures patient safety. Preparation differs for each examination.

Fasting for 4–6 hours before abdominal ultrasonography, removing metal jewelry before MRI, and renal function testing before CT contrast are key elements of preparation.

Symptoms

Preparation varies by type and area of examination
Abdominal US: 4–6 hours fasting, holding urine (for pelvic US)
MRI: information on metal implants, claustrophobia evaluation
CT contrast: questioning of renal function and allergy history
PET-CT: 6 hours fasting, blood glucose <200 mg/dL
Mammography: arriving without deodorant or lotion

Risk Factors

Inadequate preparation leads to repeating the examination
Risk of anaphylaxis increases if contrast allergy history is not reported
Serious harm may occur on MRI if metal implants are not reported
Hyperglycemia reduces PET-CT quality
Excessive bowel gas degrades abdominal US quality
Iodine allergy affects the use of iodinated contrast

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Inform the radiology unit about your medications, allergies and implants before the exam
  • Always state if you are pregnant or possibly pregnant
  • In diabetic patients, metformin is held before and after CT contrast
  • If unsure about your preparation, call the day before to ask

Treatment Methods

01
If preparation is incomplete, the exam is postponed or rescheduled
02
Premedication (steroid + antihistamine) for contrast allergy
03
If MR-incompatible implants exist, alternative imaging (CT or US) is selected
04
If blood glucose is high in PET-CT, the appointment is rescheduled after insulin therapy
05
In claustrophobia, anxiolytic medication or open MRI option is considered

Which Department to Visit?

You can visit our Radyoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Related Health Topics

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What Is MRI (Magnetic Resonance Imaging)?

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MRI uses a magnetic field and radio waves and is the gold standard for imaging the brain, spine, joints, and internal organs.

What Is CT (Computed Tomography)?

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Computed tomography provides rapid, detailed cross-sectional images in emergency, trauma, and oncology cases.

What Is Ultrasound (Ultrasonography)?

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Ultrasonography is radiation-free and is widely used in pregnancy follow-up and the evaluation of abdominal organs and superficial tissues.

What Is an X-ray (Plain Radiograph)?

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X-ray is the oldest and most widely used radiologic test, providing rapid diagnosis in bone and lung pathologies.

Mammography

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Mammography is specialized low-dose X-ray imaging of breast tissue that detects cancer, often before clinical palpation, and is the primary tool for breast cancer screening in women 40 and older per ACR/ESR guidelines.

Doppler Ultrasound

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Doppler USG is critical for evaluating deep vein thrombosis, carotid stenosis, and organ blood flow.

Angiography

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Angiography examines all vascular systems in the body in detail, especially the cardiac and cerebral vessels.

PET-CT (Positron Emission Tomography)

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PET-CT combines metabolic activity with anatomical imaging in cancer staging and treatment-response evaluation.

Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.