How to Order a Lumbar Spine MRI
Order "MRI lumbar spine without IV contrast" for most clinical scenarios requiring lumbar spine imaging. This is the standard, appropriate order for the vast majority of patients with low back pain who meet criteria for imaging 1.
Clinical Scenarios and Specific Orders
Standard Indications (Order: MRI Lumbar Spine WITHOUT IV Contrast)
Order this study when the patient has:
- Subacute or chronic low back pain (≥6 weeks) with failed conservative therapy and the patient is a surgical/intervention candidate 1
- Radiculopathy with nerve root irritation signs after 6 weeks of optimal medical management 1
- Low-velocity trauma, osteoporosis, elderly patient, or chronic steroid use (may combine with plain radiographs) 1
- Low suspicion for epidural or intraspinal disease 1
Red Flag Indications (Order: MRI Lumbar Spine WITHOUT AND WITH IV Contrast)
Order this enhanced study when suspecting:
- Cancer or metastatic disease - contrast visualizes bony/marrow involvement and epidural tumor with high resolution 1
- Spinal infection/epidural abscess - contrast distinguishes abscess from phlegmon and shows extent of involvement 1
- Immunosuppression 1
Emergency Indications (Order: MRI Lumbar Spine WITHOUT IV Contrast OR WITHOUT AND WITH IV Contrast)
For suspected cauda equina syndrome, either study is appropriate 1. Look for:
- Bladder/bowel/sexual dysfunction
- Saddle anesthesia
- Progressive bilateral leg weakness
- Absent lower limb reflexes
These are equivalent alternatives - order whichever is available fastest 1.
Post-Surgical Patients (Order: MRI Lumbar Spine WITHOUT AND WITH IV Contrast)
For patients with prior lumbar surgery and new/progressive symptoms, contrast is essential to distinguish recurrent disc herniation from postoperative scar tissue 1. Also order plain radiographs to assess hardware and fusion status.
When NOT to Order MRI
Do not order imaging for:
- Acute low back pain (<6 weeks) without red flags - imaging provides no clinical benefit and increases healthcare utilization 1
- Subacute/chronic pain without red flags and no prior conservative management - treat first, image only if treatment fails 1
Common Pitfalls to Avoid
Don't order "MRI with contrast only" - this is never performed independently as it requires correlation with noncontrast sequences 1
Don't skip the 6-week conservative therapy requirement unless red flags are present - approximately 31% of lumbar MRIs are ordered inappropriately, often because this criterion is ignored 2
Don't order MRI for every patient requesting it - patient pressure is a documented factor in inappropriate ordering, but clinical indications should guide decisions 3
Document your clinical reasoning - specify whether ordering for surgical candidacy, red flag symptoms, or failed conservative therapy to justify appropriateness
Alternative Imaging When MRI Contraindicated
If the patient cannot undergo MRI (pacemaker, severe claustrophobia, metallic implants):