What are the key concepts covered in this section?

1. Clinical biochemistry measures concentrations or activities of biologically important substances in body fluids.
2. These tests can use different types of body fluids such as blood, plasma, serum, urine, and cerebrospinal fluid.
3. Medical interpretation of a test result is based on comparison with a reference interval that normally reflects the range of expected values in healthy individuals or the medical decision level (MDL) for diagnosis and treatment of disease.
a) Only 1 and 2 are correct.
b) Only 2 and 3 are correct.
c) All three concepts are correct.