ESR-Auto Plus Operator’s Manual 51
Chapter 8
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Performance &
Technical Specifications
8.1 Overview
Many automated ESR instruments analyze samples using
similar methodology as manual ESR testing. The instruments
collect readings at two different timepoints; the first is an
initial timepoint to register the initial fill level in the tube, the
second after a specified period of time to register the level
of RBC sedimentation. These values are then converted to a
standard ESR result in mm/hr.
The ESR-Auto Plus uses the QuickMode method which
reads the RBC sedimentation level after 30 minutes and
mathematically converts it to an equivalent Modified
Westergren result in mm/hr.
8.2 Measuring Abnormal Samples
The clinical significance of an ESR result obtained from
an abnormal sample, including but not limited to icteric,
lipemic, cold agglutinins, anemic conditions, low hemoglobin
concentrations, hemolysis, or any pathological condition
that interferes or prevents a clear red blood cell to plasma
interface, should be determined by the clinician ordering
the test. Manual and automated ESR measurements in
samples without a clear interface are subject to a high
degree of variability. In the ESR-Auto Plus, the sample may
go undetected or yield variable results. Visually inspect the
sample at the conclusion of the test to confirm the presence
of a clear interface.
8.3 Fill Level
1.2ml ESR-Vacuum Tubes are evacuated to draw a 60mm
blood column. ESR-Vacuum Tubes will remain within the
stated fill level limits through the expiration date. The fill
level, expiration date and lot number are printed on the label
of each tube.
Summary of Contents for ESR-Auto Plus 506
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