User's Manual

Radical-7 Appendix: Best Practices for Comparisons to Reference Measurements
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  Secure sensor cable to patient’s arm with tape.
  Instruct subjects to remain still without any sensor movement.
  Connect sensor cable to device without pulling on sensor.
  Wait until SpHb measurement is stable (one minute) before recording
SpHb values.
  Note any Low SIQ message that displays during measurement.
5. Blood sampling and laboratory analysis:
  Record site of blood draw.
  Document exact time blood withdrawn from patient.
  When taking blood sample from arterial line, remove adequate dead
space to ensure blood sample is not diluted with solution to keep arterial
line open. When IV line set-up includes stopcocks, ensure that no fluid is
infused through the line from which you are taking the blood. Draw blood
directly into the vacutainer, if possible.
  Mix blood carefully after filling the vacutainer by rotating it gently at
least 10 times. (A rotation is one turn of the tube upside down and then
right side up.)
  All blood samples must be analyzed on the same calibrated laboratory
hematology analyzer (Coulter, Sysmex, or equivalent) to avoid variation
induced by the use of multiple laboratory devices.