The purpose of this blood serum test is to help detect and evaluate treatment of acute hepatic disease, especially hepatitis, and cirrhosis without jaundice. To help distinguish between mytyocardial (heart) and liver tissue damage (used with the AST enzyme test). Also to assess hepatotoxicity of some drugs.
The average wingspan for an NBA player (even normal 6'0 guys) is +4 inches. I think that around your height thing is just an estimate. For the general population, the average might be +2 inches.
The average height, depending on the airline would be somewhere between 1.59m (5 feet, 2 inches) and 1.89m (6 feet, 2 inches). That said, a lot of airlines conduct reach tests, they require you to reach upto a certain height with your arms extended, while on tip toes. With the average reach airlines require being between 208 cm and 214 cm, itâs unlikely you can make it if your height is any less that 1.59m.