Following trauma, a patient presents with a drop of blood at the tip of urinary meatus. He complains of inability to pass urine. Next step should be:

The patient in question is a case of posterior urethral injury. A urethral catheter may be passed into the bladder in many patients with a small, protal tear of posterior urethra. The catheter is maintained for 7 to 14 days. A voiding cystourethrogram is obtained when catheter is removed. Ref: Campbell's Urology, 7th Edition, Page 3109; Bailey and Love's Sho Practice of Surgery, 25th Edition, Pages 1364-65.