combination analysis, radio-enzymological analysis, radio-acceptor
analysis, immunity radio-analysis, etc.
RIA has the following characteristics:
1.
High sensitivity: Usually reaching 10
0-9 10-12 gram (the
highest figure is 10-15 gram).
2.
Strong specificity: When other similar substance in the
sample exists, there is no interference to the analysis.
3. Small amount of sample needed; and the operation is
simple and easy.
External diagnosis, with no radioactive matter entering
4.
the human body, so it is
especially suitable for the
diagnosis on pregnant women and children.
Its Function in Diagnosis of Tumor
The universally acknowledged antigens correlated with tumor,
at present, are a-fetoprotein (AFP) and carcinoembryonic antigen
(CEA). The application of RIA for detecting these two correlated
antigens in the patients' blood is of help for the early-stage
diagnosis of cancer. For example, AFP is a protein existing in
the early infantile period; and it disappears one week after
However, in the blood serum of the patient of primary
birth.
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