Why should you never label the blood bottle until it has been filled?

You should never label the blood bottle until it has been filled to prevent mislabeling and ensure accurate identification of the sample. Labeling before filling increases the risk of confusion or contamination, especially if multiple samples are being processed simultaneously. Once the bottle is filled, the patient's information can be directly linked to the sample, ensuring proper tracking and testing. This practice enhances patient safety and the reliability of laboratory results.