The GoPro Hero HD is squarely based off the old model. It has the same mounting system, case, physical shape and user interface. It is so similar, I suggest you read the original short review I did and then come back here for the low down on what makes this one better. Here's the link.
An alanine aminotransferase (ALT) test measures the level of ALT enzyme in your blood. ALT is an enzyme produced by liver cells. It helps the body metabolize proteins. If the liver is damaged or not functioning properly, ALT is released into the blood. This causes ALT levels to increase. The alanine aminotransferase (ALT) test is used to evaluate liver function. The test is also known as a serum glutamate pyruvate transaminase (SGPT) test or alanine transaminase test.
The alanine aminotransferase (ALT) test is typically used to detect liver injury. It is often ordered in conjunction with aspartate aminotransferase (AST) as part of a liver panel or comprehensive metabolic panel (CMP) to screen for and/or help diagnose liver disease.