What instruction should be given to a parent preparing their child for an EEG regarding hair?

The instruction to ensure that the child's hair is clean and free of conditioner before undergoing an EEG is important because any residue from hair products can interfere with the electrical signals measured during the procedure. A clean scalp allows for better electrode contact, which can improve the quality of the EEG readings. Using conditioner or other styling products might create a barrier that can impede the electrodes' ability to accurately pick up brain activity.

Maintaining clean hair helps ensure that the test results are as clear and interpretable as possible, facilitating a more accurate diagnosis.