[Solved] A thank you note should be sent one week after the interview. Occult Blood: Blood that is not visible to the naked eye, typically detected through specific medical tests in stool, which can indicate gastrointestinal issues. Specific Gravity: The ratio of dissolved substances in a solvent as compared with the ratio of dissolved substances in distilled water, most commonly comparing the ratio of dissolved substances in a urine specimen with distilled water. Reagent Strips: Test strips used for urinalysis or other tests that change color in response to various conditions or the presence of specific substances. Manufacturer's Instructions: Guidelines provided by the makers of a product on how to properly use, maintain, or install it to ensure safety and effectiveness.