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.
List of California area codes. This is a list of area codes in California with service territory and installation dates. 209 - Stockton, Modesto, Merced, Turlock; the northern San Joaquin Valley and the central Sierra Nevada range. (Split from 916 on October 26, 1957)