title: Value of a screening urinalysis in pregnancy.
abstract: In order to assess the value of a screening urinalysis in the detection of urinary tract infection, the results of routine urinalyses from 1,062 obstetric patients were compared to subsequent culture results. A positive urine culture was predicted by pyuria, bacteriuria and a positive nitrite test; the predictive values were 23%, 21% and 87%, respectively. If all the parameters were negative, 96% of the cultures were negative. These findings suggest that in the interest of cost effectiveness, the urine can be cultured only when the screening urinalysis shows pyuria, bacteriuria or a positive nitrite test.
mesh_terms: D001437:Bacteriuria / Q000175:diagnosis*; D005260:Female; D006801:Humans; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D009573:Nitrites / Q000652:urine; D011247:Pregnancy; D011251:Pregnancy Complications, Infectious / Q000175:diagnosis*; D014556:Urine / Q000382:microbiology*
chemical_list: D009573:Nitrites