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 is currently using thirty two area codes, six of which were created as area code overlays. Area Code 628 is the most recent area code introduced. It was implemented as an overlay of area code 415 on March 21, 2015. California originally had three area codes, 213, 415, and 916 when the numbering system was established in 1947. By 1951, just four years later, California experienced sufficient growth in population and telephone use to need an additional area code.