Recently, AAP published a practice guideline on “Urinary Tract Infection: Clinical Practice Guideline for the Diagnosis and Management of the Initial UTI in Febrile Infants and Children\u00a0 2 to 24 Months” in Sept, 2011. There are a lot of useful information about UTI, diagnosis and treatment. You can see the article here<\/a> but I highlighted some of data:<\/p>\n 1. If you apply urine bag and your test(culture) is negative you can count on it but if it is positive due to high false positive you should not interpret the result.<\/p>\n 2. Girls with :<\/p>\n A. no identifiable source of infection<\/p>\n B. White Race<\/p>\n C. Age < 12 months<\/p>\n D. Onset of symptoms(<2 days)<\/p>\n E. Fever =>39<\/p>\n =\u00a0 1% probability of UTI for 1 risk factor<\/p>\n = 2% probability of UTI for 2 risk factors<\/p>\n Link to AAP<\/a><\/p>\n 3. Sensitivity and Specificity of Components of Urinalysis<\/a><\/p>\n
| Test<\/th>\n | Sensitivity (Range), %<\/th>\n | Specificity (Range), %<\/th>\n<\/tr>\n<\/thead>\n |
|---|---|---|
| Leukocyte esterase test<\/td>\n | 83 (67\u201394)<\/td>\n | 78 (64\u201392)<\/td>\n<\/tr>\n |
| Nitrite test<\/td>\n | 53 (15\u201382)<\/td>\n | 98 (90\u2013100)<\/td>\n<\/tr>\n |
| Leukocyte esterase or nitrite test positive<\/td>\n | 93 (90\u2013100)<\/td>\n | 72 (58\u201391)<\/td>\n<\/tr>\n |
| Microscopy, WBCs<\/td>\n | 73 (32\u2013100)<\/td>\n | 81 (45\u201398)<\/td>\n<\/tr>\n |
| Microscopy, bacteria<\/td>\n | 81 (16\u201399)<\/td>\n | 83 (11\u2013100)<\/td>\n<\/tr>\n |
| Leukocyte esterase test, nitrite test, or microscopy positive<\/td>\n | 99.8 (99\u2013100)<\/td>\n | 70 (60\u201392)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n |
![Link to AAP<\/a><\/p>\n3. Sensitivity and Specificity of Components of Urinalysis<\/a><\/p>\n](\"http:\/\/pediatrics.aappublications.org\/content\/128\/3\/595\/F2.large.jpg\"){kind=link}