Final answer:
Matching the lot number on the panel sheet with the lot number on the panel cells is important due to the pattern of reactions changing, the ABO group potentially changing, and it being a requirement of the FD.
Step-by-step explanation:
Matching the lot number on the panel sheet with the lot number on the panel cells is important for several reasons. Firstly, the pattern of reactions can vary from lot to lot, meaning that different lots may have slightly different results. Secondly, the ABO group of the blood can change from lot to lot, so it's essential to ensure the correct blood type is determined. Lastly, it is a requirement of the FD (Food and Drug Administration) to match the lot numbers for quality control purposes.