When are blood tests used? - KXXV-TV News Channel 25 - Central Texas News and Weather for Waco, Temple, Killeen |

When are blood tests used?

Blood tests, once known as radioallergensorbent testing (RAST), often are used to test for allergies when:

  • a physician advises against the discontinuation of medications that can interfere with test results or cause medical complications;
  • a patient suffers from severe skin conditions such as widespread eczema or psoriasis;
  • a patient has such a high sensitivity level to suspected allergens that any administration of those allergens might result in potentially serious side effects.
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