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Commercially available control materials for some laboratory instruments or method systems may be assayed or unassayed. Both will monitor the accuracy and precision of the method system. However, there are differences between them. Match each of the following characteristics to either assayed or unassayed controls.

Select the correct match for each item from the drop-down box

Generally less expensive
Not linked to specific method systems
May only be suitable for certain method systems
Have assigned analyte values provided by the manufacturer of the control material