Retrospective Calibration (Retrocal) - Bayer HealthCare RapidPoint 400 Series Service Manual

• The system measures three calibrators (Wash, 200 Cal, and Zero Cal)
for all sensors.The system measures the drift and calculates the
mathematical slope and the offset for all analytes. A 2-point calibration
takes 3 minutes and 55 seconds (3:55) to complete.
A full 2-point calibration (slope and offsets for all analytes):
• A 2-point calibration adjusts both the offset and the slope drift for a
parameter by measuring two reagents of known concentration.
• The system performs a full 2-point calibration every 8 hours.
• The system measures four calibrators (Wash, 200 Cal, Zero Cal, and
Hct Cal) on all sensors. The system measures the drift and calculates
the mathematical slope and offset. A full 2-point calibration takes
5 minutes and 50 seconds (5:50) to complete. Every third full 2-point
calibration includes a blood/fiber removal sequence preceding the
calibration.

Retrospective Calibration (Retrocal)

A patient sample run during the initialization (init) period includes a
retrospective calibration (retrocal) before results are reported. A
retrospective calibration is a 1-point calibration immediately following the
sample. During the init period, if a patient sample is run, the following
occurs:
• The sample is loaded.
• An electronic measurement is performed on the sample.
• The system washes out the sample with 200 Cal and loads 200 Cal
over the sensors.
• The system performs a 1-point calibration by measuring drift for all
analytes.
• The system calculates the patient data and displays sample results.
• The system performs a wash.
This sequence from start of the sample being loaded until the wash is
complete takes 3 minutes. Sample results are posted in 2 minutes.
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