For incubation units used in microbiology, how often should calibration-corrected temperatures be recorded?

• A. Twice per day with readings separated by at least 4 hours
• B. Once per day
• C. Every hour
• D. Every 6 hours

Answer: (A)

Temperature control in incubation units is crucial because microbial growth is highly sensitive to even small changes in temperature. To ensure results remain reliable, labs document temperature verification using calibration-corrected readings. Recording twice per day with readings at least four hours apart provides a practical balance: it’s frequent enough to catch gradual drift or occasional fluctuations (from door openings, heater cycling, or ambient changes) but not so frequent that it becomes impractical. This schedule creates a clear, ongoing record that the incubator stays within acceptable limits, and it signals when maintenance or recalibration is needed. When taking the readings, use a calibrated thermometer or data-logging device, note the time and unit, and compare against your lab’s specified tolerance. If a reading falls outside the acceptable range, follow the corrective actions and recheck after adjustment or service.