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Calculating a Control Mean and Range
  1. Collect a minimum of twenty data points for each level of control.
  2. Calculate the mean and standard deviation from the data points collected.

Important: Use product insert ranges as guidelines only. Ranges are based on reagent lots and materials available at the time of value assignment. During the life of the control lot, manufacturers may reformulate tests or begin using a new source of raw materials for kit/reagent production. Published ranges cannot account for variables such as instrumentation software updates or performance differences over time.

See Also

Useful Statistics


Standard Deviation (SD)

Standard Deviation Index (SDI)


Coefficient of Variation (CV)

Determining an Acceptable CV

Coefficient of Variation Ratio (CVR)

Total Error (TE) and Total Allowable Error (TEa)