Evaluation and Management of Elevated ESR and CRP in Patients with Shoulder and Neck Pain

Immediate Clinical Assessment

The American College of Rheumatology suggests that patients with an ESR of 120 mm/h and shoulder/neck pain must be urgently evaluated for giant cell arteritis (GCA) and polymyalgia rheumatica (PMR) to prevent irreversible vision loss and other serious complications 1
Red flag symptoms of giant cell arteritis include new-onset localized headache, visual symptoms, jaw claudication, constitutional symptoms, and scalp tenderness, which require urgent referral to rheumatology or ophthalmology the same day 2
Patients with polymyalgia rheumatica should be assessed for bilateral shoulder and hip girdle pain, morning stiffness lasting >45 minutes, difficulty raising arms above shoulders, and constitutional symptoms 2

The American College of Radiology recommends ordering a complete blood count with differential, comprehensive metabolic panel, serum albumin and pre-albumin, and creatine kinase (CK) immediately to evaluate for underlying pathology 2, 1
Rheumatologic markers such as rheumatoid factor (RF) and anti-CCP antibodies, and antinuclear antibodies (ANA) should be obtained to screen for inflammatory arthritis and systemic autoimmune disease 2, 1
Temporal artery ultrasound or biopsy, MRI of cervical spine with and without contrast, and chest X-ray should be performed if GCA or other conditions are suspected 1, 3

An ESR of 120 mm/h is markedly elevated, indicating significant underlying pathology, with an ESR >100 mm/h having 92.2% specificity for giant cell arteritis 1
The discordance between a very high ESR and relatively modest CRP is clinically significant and suggests specific etiologies such as infection, renal insufficiency, or low albumin states 1

Giant Cell Arteritis is a highest priority concern, with ESR >100 mm/h strongly suggesting this diagnosis, and untreated GCA causing irreversible blindness in 15-20% of patients 1
Polymyalgia Rheumatica is also a highest priority concern, with ESR >40 mm/h associated with higher relapse rates, and bilateral shoulder pain with this ESR level being highly suggestive 1
Spinal Infection (Osteomyelitis/Discitis) is a secondary concern, especially if fever, night pain, or risk factors are present, with ESR ≥70 mm/h having 81% sensitivity for osteomyelitis 3, 1

The American College of Rheumatology recommends repeating ESR and CRP in 2-4 weeks if initial workup is unrevealing, and monitoring ESR every 1-3 months if inflammatory condition is diagnosed, until remission is achieved 1
CRP normalizes faster than ESR during treatment, making it more useful for monitoring acute treatment response 4