Diagnostic analyzer having a dual-purpose imager

A reagent analyzer, comprising:

• a sample tray configured to hold a reagent test device with a portion of a fluid sample applied to the reagent test device;
• an imaging system having a first field of view and a second field of view, the first field of view encompassing at least a portion of the reagent test device held in the sample tray, the second field of view encompassing an information indicator, the imaging system configured to capture a first image having pixels using the first field of view and to capture a second image having pixels using the second field of view, the first image depicting at least a portion of the reagent test device and the second image depicting the information indicator;
• a mirror moveable between a first position to provide the first field of view and a second position to provide the second field of view, the second position located between the imaging system and the sample tray, the mirror in the second position reflecting light to produce the second field of view to the imaging system to capture the second image;
• and
• a computer processor executing instructions that cause the computer processor to:
• receive the first image and the second image;
• analyze the pixels of the second image to determine calibration information from the information indicator for analyzing the fluid sample;
• and
• analyze the pixels of the first image to determine a presence or an absence of a target constituent being in the fluid sample applied to the reagent test device, using, in part, the determined calibration information.