Background : The purpose of this study is to investigate the in vitro effect of Ho – YAG laser on Complete Blood Picture in blood sample from ureteroscopic lithotripsy ( patients with urinary stones ) . The study is conduct the effect Ho-YAG laser on Complete Blood Count (CBC) was estimated before and after exposure in vitro . The study was conducted on Complete Blood Picture , the taken number of (10) parameters was estimated before and after exposure . Result showed that there was a significant decreased in the percentage of Lymphocyte , PLT , HCT , RBC , HBG , MCHC , after exposure to 2100 nm (Ho-YAG ) laser . It is found that (Ho-YAG ) laser increase some parameters of WBCs , MCV , MONO and MCH and after exposure.

Infrared spectroscopic method (physical method) of stone analysis was used to study forty ureteric calculi that were extracted by different techniques or past spontaneously from patients with age range 2-63 years, 27male and 13 female, and overall sex ratio 2:1 . We found the most common stones were pure calcium oxalate monohydrate 42.5% followed by pure uric acid stones 12.5% and ammonium acid urate 10% , pure stone constitute about 80% and mixed stones constitute about 20% with calcium oxalate monohydrate and uric acid (mixed stone) about 7.5% . The risk of having specific type of stone was analyzed by selected predictor variables :- mixed type stone was significantly associated with past history of urolithiasis, gout with urate type of stone and young female with recurrent UTI with phosphate type of stone . The success rate of stone retrieval by ureteroscopy and ESWL was found to be inversely related to:- UTI, past history of urolithiasis, mixed type of stone, stone size > 1.2 cm, phosphate variety of stones . Stone distribution by age and sex was different according to the crystalline component of each type .