A 5-year-old girl represents to your emergency department. She was seen last week for a limp and diagnosed with transient synovitis. She has continued to complain of knee pain and this morning seems more unwell with a fever and lethargy.
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What is your initial approach to management?
An hour later the patient’s blood results are returned:
Haemoglobin (g/L) | 70 (115-165) |
Mean Cell Volume (fl) | 105 (80-100) |
Platelets (109/L) | 60 (150-400) |
White cell count (109/L) | 2 (4-11) |
CRP mg/L | 20 (0-5) |
In addition to septic arthritis or osteomyelitis, what other diagnoses should you consider at this point and what further blood tests are required?