miscellaneous

• acceptable for Chloride determination: serum, plasma, urine, sweat
• acceptable for calcium determination: acidified urine, serum, heparinized plasma
• Know why a western blot is necessary for a positive HIV screening (ELISA) test

  Cross-reacting antibodies may exist. Western blot is more specific
• beer's law

  A) abs. of unknown

  B) abs. of standard

  C) concentration of standard