Patient group | Test |
---|---|
All children with joint symptoms | CRP ESR Basic blood count with platelet count Streptococcal throat smear Chemical urinalysis |
Arthritis that has lasted for more than 2 weeks, or a suspicion of enteroarthritis (history of a diarrhoeal disease) At discretion | Antinuclear antibodies, antistreptolysin (ASO) and anti-streptococcal DNase antibodies Yersinia, Campylobacter and Salmonella serology (age > 5 yrs) Borrelia serology (history of a tick bite or stay in an area endemic with ticks) Faecal bacterial culture (only in case of diarrhoea and age > 5 yrs) Imaging studies (ultrasonography or x-ray) in unclear cases |
Further investigations by a paediatrician | Rheumatoid factor and CCP antibodies HLAB27 (Viral antibodies) |