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Figure 20.2 Standard and flexible capillary tubes.

The volume of red cell is read in percentage from the point on the scale directly beneath the red line of the plastic indicator. The hematocrit percentage is read between the red cell column and the clear plasma column.

Figure 20.2 Standard and flexible capillary tubes.

300 PartV • Laboratory Procedures

Serum

Buffy coat

Red blood cell volume

Clay plug

Figure 20.3 Capillary tubes. Note the distinct layers once blood sample has been spun.

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