title: Estimation of blood loss in transurethral resection of prostate (TUR-P) by urine-strip.
abstract: OBJECTIVE
  Blood loss in transurethral resection ofprostate (TUR-P) operation is estimated by the difference between pre- and post-operative hemoglobin (Hb) concentration. The authors introduced a novel practical method to estimate blood loss in the patients who were surgically managed with TUR-P operation.
  
  
  METHODS
  Complete blood count was collected pre-operative, immediate post-operative, and 24-hour post-operative to determine red blood cells and Hb concentration. Hemoglobin of irrigating fluid was measured by standard spectrophotometry and blood loss was estimated by the authors' calculation. Irrigating fluid was frozen and thawed to completely hemolyse the red blood cells, then it was tested by urine-strips and calculated for red cells using estimating cell ranges given by the product's prescription. The correlation between these indicators was evaluated.
  
  
  RESULTS
  Calculated blood loss detected by spectrophotometric method has no correlation with immediate post-operative or 24-hour post-operative Hb concentration. However, it had a significant positive correlation with calculated blood loss by urine-strip technique (r = 0.897, p = 0.01).
  
  
  CONCLUSIONS
  Urine-strip method can be used to estimate total blood loss in irrigating fluid in patients with TUR-P operation. This is practical and useful in immediate post-operative evaluation of blood loss to consider the need of blood transfusion.
authors.affiliation: Department of Surgery, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand.
authors.forename: Wattanachai
authors.initials: W
authors.lastname: Ungjaroenwathana
authors.forename: Chanatee
authors.initials: C
authors.lastname: Bunyaratavej
authors.forename: Piyaratana
authors.initials: P
authors.lastname: Tosukhowong
authors.forename: Thasinas
authors.initials: T
authors.lastname: Dissayabutra
mesh_terms: D001772:Blood Cell Count; D001803:Blood Transfusion; D006454:Hemoglobins; D006470:Hemorrhage / Q000175:diagnosis / Q000209:etiology*; D006801:Humans; D008297:Male; D011467:Prostate / Q000601:surgery*; D012307:Risk Factors; D013053:Spectrophotometry; D007507:Therapeutic Irrigation; D013997:Time Factors; D020728:Transurethral Resection of Prostate / Q000009:adverse effects*
chemical_list: D006454:Hemoglobins