Is it legal to write left or right if marker is not visible on an xray?

Yes, it is generally legal to write "left" or "right" on an X-ray if the marker is not visible, but it is crucial to ensure that the interpretation of the X-ray is accurate and clear. Proper documentation and communication with the healthcare team are essential to prevent any potential misinterpretation. It's always best practice to use appropriate markers and techniques to avoid ambiguity in imaging.