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.
Confidence votes 35.1K. I have maintained a website about telephone numbering for 18 years. In the original area code system in 1947, all of southern California, including Los Angeles, San Diego, Palm Springs, and Bakersfield, was area code 213, but that area code is now only the inner core of downtown Los Angeles. The following area codes serve parts of southern California, in or near L.A.: