Which urine stream is required (c/s) for klebsiella pneumoniae detection?

Culture. I am not sure what urinary stream you mean but a clean catch which is sent for a urine culture is sent from the midstream if possible and if not possible must clean the outside of the genital prior to voiding.
Midstream specimen. Almost any urine specimen, whether for urinalysis or culture for UTI (with Klebsiella or anything else), should be a clean catch, midstream specimen. The main exception is STD testing (gonorrhea, chlamydia), which is best on first ounce of voided urine.