Can my Blood Alcohol Concentration change if I drink the same amount of alcohol on different days?

Yes. Drinking the same amount of alcohol on different days can result in different BAC levels as there are many factors affecting the BAC. Another thing to keep in mind when drinking alcohol is that alcohol stays in your system for many hours. Many drivers test above 0 BAC the morning after drinking.

The United Kingdom has tough laws on drunk driving. Do not drink and drive.