If power goes out at 11:45 pm, what step would the processor be on?

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Multiple Choice

If power goes out at 11:45 pm, what step would the processor be on?

Explanation:
The key idea is the order of tissue processing steps after fixation. After specimens are fixed in formalin, they go through dehydration with alcohols, finishing with absolute (100%) alcohol to remove water completely before clearing. Clearing with xylene then follows, and after that you infiltrate with molten paraffin. If power goes out late in the cycle, the process is most likely at the final dehydration stage using absolute alcohol, right before clearing. Formalin is the fixation stage at the start, and xylene and paraffin infiltration occur after dehydration and clearing, so they would come later in the sequence.

The key idea is the order of tissue processing steps after fixation. After specimens are fixed in formalin, they go through dehydration with alcohols, finishing with absolute (100%) alcohol to remove water completely before clearing. Clearing with xylene then follows, and after that you infiltrate with molten paraffin. If power goes out late in the cycle, the process is most likely at the final dehydration stage using absolute alcohol, right before clearing. Formalin is the fixation stage at the start, and xylene and paraffin infiltration occur after dehydration and clearing, so they would come later in the sequence.

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