Recommended Workup for a Young Female with Joint Pains

Initial Assessment

Clinical examination remains the cornerstone of detecting synovitis and should be the first step in evaluating joint pain in young adults 2
Joint swelling associated with pain or stiffness, particularly if involving more than one joint, should prompt referral to a rheumatologist, ideally within 6 weeks of symptom onset 3
Morning stiffness lasting more than 30 minutes and involvement of metacarpophalangeal and/or metatarsophalangeal joints are particularly concerning (positive "squeeze test") 3

A minimal laboratory testing panel should include C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR) 1, complete blood cell count 3, transaminase levels (liver function) 4, renal function tests 5, urinalysis 4, and antinuclear antibodies (ANA) 4
Additional tests to assess risk of persistent and erosive disease include rheumatoid factor (RF) 1 and anti-citrullinated peptide antibodies (ACPA) 1

Clinical examination is the method of choice for detecting arthritis, with imaging used primarily for confirmation 1
In doubtful cases, ultrasound with power Doppler may be helpful to detect synovitis 4
MRI can be considered when clinical examination and ultrasound are inconclusive 4
Radiographs of hands and feet should be obtained to assess for erosions, which are predictive of persistent disease 4, 2

After initial workup, assess for factors predicting persistent and erosive disease, including number of swollen and tender joints 4, elevated acute phase reactants (ESR/CRP) 5, presence of RF and ACPA 1, and radiographic erosions 5

If diagnosis remains uncertain (undifferentiated arthritis), continue monitoring with assessment of tender and swollen joint counts, patient and physician global assessments, ESR, and CRP at 1-3 month intervals 2
Structural damage should be assessed by radiographs of hands and feet every 6-12 months during the first few years 4
Functional assessments can complement disease activity monitoring 2
Early diagnosis and treatment are critical, as joint damage can occur early in inflammatory arthritis, with more than 80% of patients with disease duration less than two years already showing radiographic evidence of joint damage 5