SnapshotNIR is a near-infrared (NIR), reflectance-based technology that measures tissue oxygen saturation (St02) in superficial tissue. Using multiple wavelengths of NIR light, SnapshotNIR measures relative amounts of oxygenated and deoxygenated hemoglobin in the microcirculation where oxygen exchange is happening. Snapshot provides users with a tissue oxygenation map that can be used in medical decision making, for tracking and trending oxygenation, and for evaluating tissue viability.