Therapeutic Drug Monitoring and Pharmacokinetics
Q: The drug warfarin has a narrow therapeutic index and its effect is monitored using the International Normalized Ratio (INR). True or False?
Did You Know?
This statement is true. Immunofluorescence (IF) is a powerful sister technique to enzymatic IHC. Instead of using an enzyme to produce a colored precipitate, IF uses antibodies that are directly tagged with fluorescent dye molecules called **fluorochromes** (e.g., FITC, which glows green, or TRITC, which glows red). When light of a specific wavelength (usually from a laser or special lamp on a fluorescence microscope) shines on the tissue, it excites the fluorochrome. The fluorochrome then almost immediately emits light of a longer, different wavelength, which is visible as a bright color against a dark background. This allows for stunning visualization of multiple different antigens in the same tissue section by using different colored fluorochromes. IF is especially vital in fields like immunology, nephrology (for diagnosing kidney diseases like glomerulonephritis), and dermatology, where pinpointing the precise location and pattern of antigen deposition is key to diagnosis.
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