Common Imaging Referral Mistakes - And How to Avoid Them
The most common errors GPs make when writing imaging referrals in Australia - including missing information, wrong modality selection, and Medicare pitfalls - with practical fixes for each.
In this guide
- 1.Why referral mistakes matter in practice
- 2.Mistake 1: Vague or missing clinical indication
- 3.Mistake 2: Wrong modality for the clinical question
- 4.Mistake 3: Missing laterality or body part specificity
- 5.Mistake 4: Forgetting contraindication information
- 6.Mistake 5: Ordering imaging without examining the patient first
- 7.Mistake 6: Not knowing when imaging is not indicated
Why referral mistakes matter in practice
Referral errors don't just cause administrative inconvenience - they affect patient outcomes. A study of Australian radiology departments found that up to 25% of referrals lack sufficient clinical information for the radiologist to tailor their protocol.
The result: generic scan protocols, generic reports, callbacks to the referring practice, and occasionally the wrong test performed entirely.
The good news: almost all common referral mistakes are simple to fix with awareness and a consistent template.
Mistake 1: Vague or missing clinical indication
The problem: Writing "back pain" or "?pathology" without context.
Why it matters: The radiologist uses the clinical indication to decide what to look for, which protocol to use, and whether to modify the scan. Without context, they default to a generic protocol and report generically.
The fix: Always include duration, relevant history, examination findings, and your specific clinical question.
Instead of: "Back pain" Write: "MRI lumbar spine - 55F, 6 weeks right-sided L4/5 radiculopathy, positive straight leg raise, no red flags. Previous X-ray NAD. Rule out disc herniation."
Instead of: "?Pathology CT chest" Write: "CT chest - 63M, 15 pack-year ex-smoker, 3 months haemoptysis, 5kg weight loss. ?Lung malignancy. CXR showed RUL opacity."
Mistake 2: Wrong modality for the clinical question
The problem: Ordering X-ray when MRI is needed, or CT when ultrasound would suffice.
Common examples: • Ordering X-ray for suspected soft tissue injury (X-ray doesn't show tendons or ligaments) • Ordering CT when ultrasound is preferred for pregnancy, children, or soft abdominal organs • Ordering MRI when CT is needed urgently (speed matters in trauma and acute chest pain)
The fix: Use the clinical question to guide modality selection. If you are unsure, it is entirely reasonable to call the radiology clinic before writing the referral - most clinics are happy to advise on the most appropriate test for a given indication.
See our MRI vs CT for GPs guide and Choosing the Right Imaging Test guide for quick reference.
Mistake 3: Missing laterality or body part specificity
The problem: Writing "shoulder MRI" when you mean "right shoulder MRI", or "knee X-ray" when you want bilateral standing films.
Why it matters: The clinic needs to set up the correct scan. Laterality errors can result in the wrong side being imaged - a significant clinical risk.
The fix: Always specify left or right. If bilateral imaging is needed, explicitly write "bilateral".
Also specify the region within an area if relevant: • "MRI cervical spine" vs "MRI lumbar spine" (not just "MRI spine") • "CT head" vs "CT neck" vs "CT head and neck" • "Ultrasound right shoulder - supraspinatus" vs generic "shoulder ultrasound"
Mistake 4: Forgetting contraindication information
The problem: Not documenting contrast allergy, renal impairment, metal implants, or pregnancy on the referral.
Why it matters: • A patient with severe iodine allergy who receives CT contrast without pre-medication can have a severe anaphylactic reaction • A patient with eGFR <30 who receives gadolinium MRI contrast is at risk of nephrogenic systemic fibrosis • Undisclosed pacemakers or cochlear implants can be damaged or dislodged in an MRI scanner • Undisclosed pregnancy leads to unnecessary radiation exposure
The fix: Include a brief contraindication note on every referral. Even "no known contraindications" is helpful. For at-risk patients, always document: • Contrast allergy severity and prior reactions • eGFR result and date if contrast CT or MRI is being ordered • Metal implants - type and approximate date of insertion • Pregnancy status or last menstrual period if relevant
Mistake 5: Ordering imaging without examining the patient first
The problem: Writing a referral based on patient history alone without a clinical examination.
Why it matters: Medicare requires that imaging be clinically indicated based on history AND examination. A referral that lacks examination findings may attract an audit query.
More importantly: examination findings guide the specific clinical question. A patient with back pain and a positive straight leg raise needs a different MRI protocol to a patient with mechanical back pain and no neurological signs.
The fix: Examine before you refer. Document your positive and relevant negative findings on the referral, not just the symptom.
Mistake 6: Not knowing when imaging is not indicated
The problem: Ordering imaging when guidelines recommend watchful waiting or a clinical trial of treatment first.
Common examples: • Lumbar spine X-ray or MRI for non-specific low back pain within the first 6 weeks (no red flags) • CT head for tension-type headache without red flags • Knee X-ray for suspected soft tissue injury in a young patient
Why it matters: Unnecessary imaging exposes patients to radiation, creates incidental findings that require further workup, and contributes to healthcare system costs.
The fix: Refer to the Royal Australian College of General Practitioners (RACGP) guidelines and the Choosing Wisely Australia recommendations for common imaging indications. When in doubt, a clinical trial of treatment with clear re-assessment criteria is often the most evidence-based approach for non-acute presentations.
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Medical disclaimer: This guide is for general informational purposes only and is not a substitute for professional medical advice. Always consult your referring doctor for advice specific to your condition. Information is current as of June 2026.