PN 4237242C
4.28-2
SERVICE AND REPAIR PROCEDURES
AIM ADJUSTMENT
Option 2
Many customers in the MD II market do not have samples of blood at installation, or have
only fingerpick samples, which are not ideal for AIM adjustment. Though not preferred, 4C
PLUS cell control can be used to adjust the AIM values.
This method produces an RBC 26th percentile target similar to the preferred fresh
whole-blood results. For WBC, the value is about 1.5% lower than the value produced using
fresh whole blood. Since the low control is generally about 3.0% below the AIM target for
fresh blood, using this lower 26th percentile value is an acceptable compromise. If a value
matching fresh whole blood is desired, multiply the average WBC obtained value by 1.015.
1. Run the high control five times. Print or record the WBC and RBC measured 26
percentile value after each run.
2. Average the five WBC and the five RBC 26th percentile readings.
3. If the averages are within ±25 of the instrument target values, do not adjust. If the
averages are outside this range, adjustment is required. Adjust to the average values.
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