A positive hCG (human chorionic gonadotropin) result depends on the type of test used. Generally, urine tests are less sensitive than blood tests.
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Urine hCG Tests: These tests typically detect hCG levels starting at 20 to 50 mIU/mL. Some tests may detect levels as low as 6.3 to 12.5 mIU/mL. A result at or above these levels generally indicates a positive pregnancy test. It's important to note that urine tests are qualitative, meaning they report a positive or negative result, rather than a specific hCG level. The reference suggests this corresponds to approximately 4 weeks post-conception.
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Serum (Blood) hCG Tests: These tests are more sensitive and can detect lower levels of hCG. A serum beta-hCG assay can often detect levels as low as 1 to 2 mIU/mL. Blood tests can also be quantitative, meaning they provide the specific level of hCG in the blood.
| Test Type | Positive hCG Level (Approximate) |
|---|---|
| Urine Test | 20-50 mIU/mL (Some as low as 6.3-12.5 mIU/mL) |
| Serum (Blood) Test | 1-2 mIU/mL |
Therefore, the amount of hCG considered "positive" varies significantly depending on whether you are using a urine or blood test. A blood test will detect pregnancy earlier due to its increased sensitivity.
