are leukocytes caused from std like chlamydia?
Identification of leukocyts esterase activity on first-catch urine specimens has been shown to be useful in screening adolescent males for urethritis. The sensitivity of leukocyte esterase on first-voided urine is 72% to 100%, and specificity is 83% to 93% for detection of either gonorrhea or Chlamydia (8,9).