How is Hematocrit Monitored Today?
Hematocrit is typically measured by taking a blood sample from the patient and processing the sample through an automated machine. However, the machine does no directly measure Hematocrit. Instead an estimation is made based on the amount of hemoglobin. The Hematocrit can be determined directly using a centrifuge. After centrifuging the sample of blood, the red blood cells will pack into the bottom of the tube. By visual inspection, the ratio of red blood cells to volume can be determined. (www.medicinenet.com/hematocrit/article.htm)
These methods are adequate for screening and diagnosis but during a surgery can be problematic. Measurement of Hematocrit requires the collection of a blood sample and transport to a lab for analysis. This involves the operating room staff and distracts from the care of the patient. If the lab is not local and delivery is subjected to delays, this could either delay the surgery or cause decisions to be made without adequate information.