Key result
Gravimetric estimation of intraoperative blood loss showed no statistically significant correlation with actual blood loss measured by the colorimetric method (P=0.074).
Why the study?
Does gravimetric estimation accurately measure intraoperative blood loss compared to the colorimetric method?
Observational (n=40)
Does gravimetric estimation accurately measure intraoperative blood loss compared to the colorimetric method?
The gravimetric method of assessing intraoperative blood loss is neither precise nor accurate when compared to the colorimetric method.
Answers are grounded in this paper and cite their sources.
Gravimetric blood loss estimates in gynecology may lack accuracy; larger prospective validation studies are needed before changing practice.
Our objective was to assess the accuracy of gravimetric estimation of intraoperative blood loss using the colorimetric method. Forty laparotomy sponges were selected randomly from general gynecology cases during a 2 month period. The blood contained on each sponge had been assessed by the OR staff by weighing the sponges. The hemoglobin contained in the sponges was then converted to alkali hematin and measured in a Beckman spectrophotometer at 465 nm. Using the patient's preoperative hemoglobin measurement, the amount of blood present in the sponges was determined. The gravimetric and colorimetric measurements were compared statistically. We found no statistically significant correlation between the amount of blood loss estimated by the gravimetric method and the actual blood loss as measured by the colorimetric method (P = 0.074). The gravimetric method of assessing intraoperative blood loss is neither precise nor accurate.
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JOHAR et al. (1993) conducted an observational in Intraoperative blood loss (n=40). Gravimetric estimation vs. Colorimetric method was evaluated on Correlation between gravimetric and colorimetric measurements of blood loss (p=0.074). Gravimetric estimation of intraoperative blood loss showed no statistically significant correlation with actual blood loss measured by the colorimetric method (P=0.074).
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