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.
Each of the 31 area codes in California are listed below. The California area code listing below lists area codes in several sections. First, CA area codes by city are shown for the largest cities in California. Next, the list shows California area codes by number.