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2. Pregnancy test - Wikipedia

   en.wikipedia.org/wiki/Pregnancy_test

   False negative readings can occur when testing is done too early. hCG levels rise rapidly in early pregnancy and the chances of false negative test results diminish with time (increasing gestational age). [24] Less sensitive urine tests and qualitative blood tests may not detect pregnancy until three or four days after implantation. [25]

3. False positives and false negatives - Wikipedia

   en.wikipedia.org/wiki/False_positives_and_false...

   A false negative error, or false negative, is a test result which wrongly indicates that a condition does not hold. For example, when a pregnancy test indicates a woman is not pregnant, but she is, or when a person guilty of a crime is acquitted, these are false negatives.

4. *This* Is The Best Time Of Day To Take A Pregnancy Test For ...

   www.aol.com/best-time-day-pregnancy-test...

   Pregnancy Test For Early Result. Some tests only offer a positive or negative result, but Wondfo has an invalid option to let you know if you need a redo—this is way better than receiving a ...

5. Contraction stress test - Wikipedia

   en.wikipedia.org/wiki/Contraction_stress_test

   The CST is used for its high negative predictive value. A negative result is highly predictive of fetal wellbeing and tolerance of labor. The test has a poor positive predictive value with false-positive results in as many as 30% of cases. [4] [5] A positive CST indicates high risk of fetal death due to hypoxia [3] and is a contraindication to ...

6. Couple documents how difficult negative test results can be ...

   www.aol.com/couple-documents-difficult-negative...

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7. Cryptic pregnancy - Wikipedia

   en.wikipedia.org/wiki/Cryptic_pregnancy

   The women involved often did not gain weight or experience other major symptoms of pregnancy, such as morning sickness or breast sensitivity. Those who did experience some symptoms of pregnancy either claimed to attribute the symptoms to an existing condition, claimed to have taken a home pregnancy test and gotten a negative result, or both.