The nurse is preparing an educational program on the different types of pregnancy tests. What should the nurse include about the ?-subunit radioimmunoassay (RIA) test? Select all that apply
1. It causes a color change.
2. It takes 2 to 3 hours to perform.
3. It is able to detect trophoblastic disease.
4. It is able to detect an ectopic pregnancy.
5. It is the same as an over-the-counter test.
3, 4
Explanation:
1. Enzyme-linked immunosorbent assay (ELISA) uses a substance that results in a color change after binding.
2. Fluoroimmunoassay (FIA) takes about 2 to 3 hours to perform.
3. ?-Subunit radioimmunoassay (RIA) uses an antiserum with specificity for the ?-subunit of hCG in blood plasma. This test may not only detect pregnancy but also detect trophoblastic disease.
4. ?-Subunit radioimmunoassay (RIA) uses an antiserum with specificity for the ?-subunit of hCG in blood plasma. This test may not only detect pregnancy but also detect an ectopic pregnancy.
5. Over-the-counter pregnancy tests are ELISA tests. This assay, which may be done on urine or blood, is sensitive and quick. It can detect hCG levels as early as 7 to 9 days after ovulation and conception, which is 5 days before the first missed period.
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