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The calculation of sensitivity does not take into account indeterminate test results. If a test cannot be repeated, indeterminate samples either should be excluded from the analysis (the number of exclusions should be stated when quoting sensitivity) or can be treated as false negatives (which gives the worst-case value for sensitivity and may ...
Pregnancy tests may be used to predict if a pregnancy is likely to continue or is abnormal. Miscarriage, or spontaneous abortion or pregnancy loss , is common in early pregnancy. [ 29 ] Serial quantitative blood tests may be done, usually 48 hours apart, and interpreted based on the knowledge that hCG in a viable normal pregnancy rises rapidly ...
The false positive rate (FPR) is the proportion of all negatives that still yield positive test outcomes, i.e., the conditional probability of a positive test result given an event that was not present. The false positive rate is equal to the significance level. The specificity of the test is equal to 1 minus the false positive rate.
The AFP test is often done in the second trimester using the serum from the maternal blood draw. This test looks at a specific protein that is formed in the liver of the fetus and released into the fluid contents of the womb, which is then absorbed into the mother's blood stream. Multiple determinations stem from the results of AFP testing.
Dilation is a measure of how open the cervical os is. It is usually the most important indicator of progression through the first stage of labour. Dilation is measured by way of a digital cervical exam with the care providers fingers. Dilation is described using centimetres; closed, 1cm, 2cm, 3cm, etc until fully dilated at 10 cm. Fetal station ...
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This test is able to detect luteinizing hormone and estrone-3-glucuronide 90% of the time. This test can be used in multiple ways. A few drops of urine can be added to the test device tip. Alternatively, the test device tip can be held in the urine stream. Finally, the test device tip can be dipped into a cup of urine.
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