No, the thyroxine concentration may not always be increased. However, these T4 values are usually at the upper end of the reference range. There are a number of potential reasons for this. Thyroxine levels in the blood naturally fluctuate throughout the day, depending on the metabolic needs of the cat.
The Adventures of Robin Hood is a 1938 American Technicolor swashbuckler film, produced by Hal B. Wallis and Henry Blanke, directed by Michael Curtiz and William Keighley, that stars Errol Flynn, Olivia de Havilland, Basil Rathbone, and Claude Rains.
1993: Mel Brooks's Robin Hood: Men in Tights spoofs both the 1938 and the 1991 films and recycles bits from his short-lived late-1975 Robin Hood TV sitcom When Things Were Rotten. Cary Elwes plays Robin in the movie, and Patrick Stewart appears in the ending, spoofing Sean Connery's take on King Richard.