Guide. A cortisol test is done to measure the level of the hormone cortisol in the blood. The cortisol level may show problems with the adrenal glands or pituitary gland.
Berkeley lies within telephone area code 510 (until September 2, 1991, Berkeley was part of the 415 telephone code that now covers only San Francisco and Marin counties), and the postal ZIP codes are 94701 through 94710, 94712, and 94720 for the University of California campus.
California area codes. The map above is clickable; click on an area code to go to the page for that area code. The area code in red is area code 209; all others in blue are California area codes.Area code 209 is the California telephone area code that was split from area code 916 on October 26, 1957.rea code 209 is the California telephone area code that was split from area code 916 on October 26, 1957.