Annals of Internal Medicine 2007 (Oct 2); 147 (7): 478–491
Do not use this algorithm for back pain associated with major trauma, nonspinal back pain, or back pain due to systemic illness.
CRP = C-reactive protein
EMG = electromyography
ESR = erythrocyte sedimentation rate
MRI = magnetic resonance imaging
NCV = nerve conduction velocity.