<prompt> A 7-year-old child with the rheumatic fever, the following investigations would be needed exceptElectrocardiogramEchocardiogramBlood cultureUrine examination  <response>: Recommended Tests in Cases of Possible Acute Rheumatic Fever : White blood cell count Erythrocyte sedimentation rate C-reactive protein Blood cultures if febrile Electrocardiogram if prolonged P-R interval or other rhythm abnormality, repeat in 2 weeks and again at 2 months if still abnormal Chest x-ray if clinical or echocardiographic evidence of carditis Echocardiogram consider repeating after 1 month if negative Throat swab preferably before giving antibiotics--culture for group A streptococcus Antistreptococcal serology: both anti-streptolysin O and anti-DNase B titers, if available repeat 10-14 days later if first test not confirmatory Ref : Harrison 19th edition pg: 2153 