hearth pregnancy tests give women t...

hearth pregnancy tests give women the opportunity to determine whether they are pregnant within the privacy of their have homes. These tests have become likewise popular that they are now the greatest in quantity commonly used over-the-counter disposable health kits. household pregnancy tests were introduced in 1975 and, since then, more than 20 brands have become available. These testing kits use present immunometric assays, and the manufacturers claim that the ordeals can be used on the first day of the missed period. In addition, the manufacturers claim that the ordeals are accurate more than 99 percent of the time. Because these proofs are used to confirm an intended or unintended pregnancy, verifying the accuracy of these claims is important. cabbage and colleagues assessed the validity of the claim of more than 99 percent accuracy of domestic circle pregnancy tests on the first day of the missed period.

In the first phase of the cogitation urine human chorionic gonadotropin (hCG) evens were assessed during early pregnancy through checking urine samples from women who were between four weeks and naught days and four weeks and three days from their last menstrual period and were pregnant. This information was used to statistically determine the mean, 5th and 95th percentiles of hCG concentration.

The nearest step was to test each of the 18 brands of hearthstone pregnancy tests using five concentrations of urine hCG Each brand was ordealed six different times. The urine concentration of hCG was established through adding recombinant hCG in concentrations of naught 12.5, 25, 50 and 100 mIU by mL. Sensitivity was defined as the urine concentration at which six of six ordeals gave positive results at the adviseed or extended time.

The calculated mean urine hCG concentration after missed mense was 49 mIU by means of mL, the 5th percentile was 124 mIU by mL, and the 95th percentile was 241 mIU by mL. The home pregnancy proofs had to be able to lay open a urine concentration level of 124 mIU for mL to confirm intrauterine pregnancies 95 percent of the time. To be 95 percent accurate at days 1 2 and 3 after missed mense the concentration of urine hCG had to be 21 35 and 58 mIU by mL. Of the 18 brands included, barely one test had a sensitivity that lay opened the 12.5 mIU per mL even If read at the moveed time, only 44 percent of the brands could discover urine hCG concentrations at 100 mIU by mL. When extended time was allowed or a answer that was "faintly" positive was considered, all 18 brands were positive at 100 mIU for mL. The authors estimated that 100 mIU for mL was equivalent to the 84th percentile at the time of the missed period, in such a manner these tests would detect solely about 16 percent of pregnancies.

The authors finish that the utility of abode pregnancy tests is questionable and that clinicians should be aware of the limitations of these examples They recommend that these issues be addressed because a missed diagnosis of pregnancy can have a significant impact forward prenatal care and changes in medications and behaviors that are consistent with healthy pregnancy.

cabbage LA, et al. Accuracy of domestic circle pregnancy tests at the time of missed mense Am J Obstet Gynecol January 2004;190:100-5

COPYRIGHT 2004 American Academy of Family Physicians

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