Pregnancy Test
Pregnancy Test - Related Videos
04:11
High-frequency Ultrasonography Based Early Pregnancy Characterization: A Technique to Study Embryo Implantation and Pregnancy Progression in Pregnant Murine Model
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2025
In this video, we demonstrate high-frequency ultrasonography to image embryo implantation sites in a pregnant murine model. This imaging technique successfully detects viable pregnancy and characterizes embryo-implantation sites during early murine pregnancy.
07:04
A Novel Use of Three-dimensional High-frequency Ultrasonography for Early Pregnancy Characterization in the Mouse
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Cited by 5 •
2017
Mice are widely used to study gestational biology. However, pregnancy termination is required for such studies which precludes longitudinal investigations and necessitates the use of large numbers of animals. Therefore, we describe a non-invasive technique of high-frequency ultrasonography for early detection and monitoring of post-implantation events in the pregnant mouse.
09:26
Transabdominal Ultrasound for Pregnancy Diagnosis in Reeves' Muntjac Deer
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Cited by 2 •
2014
Transabdominal ultrasound is described as an effective, noninvasive means for assessing reproductive status in Reeves' muntjac deer. These methods can be used to achieve early pregnancy diagnosis and to evaluate fetal viability. Future applications of this technique include estimation of gestational age and effects of maternal disease on fetal development.
06:55
Assessment of Maternal Vascular Remodeling During Pregnancy in the Mouse Uterus
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Cited by 27 •
2015
This protocol describes a technique to assess changes in the maternal vasculature during pregnancy in mice. Using stereological methods, remodeling of the decidual spiral arteries is assessed quantitatively and the results confirmed qualitatively using immunohistochemistry.
11:08
The Use of Gas Chromatography to Analyze Compositional Changes of Fatty Acids in Rat Liver Tissue during Pregnancy
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Cited by 71 •
2014
Pregnancy leads to significant changes to the fatty acid composition of maternal tissues. Lipid profiles can be obtained via gas chromatography to allow identification and quantification of fatty acids in individual lipid classes among rats fed various high and low fat diets during pregnancy.
FAQs
Interpretation depends on when implantation has occurred because hCG is produced after the embryo implants in the uterine lining. A test performed before enough time has passed may not detect the hormone, even when pregnancy will later be identifiable. Thus, a negative result can reflect the biological timing of hCG appearance rather than absence of pregnancy.
Home assays use antibodies that bind hCG in urine. When that binding occurs, the test converts the molecular recognition event into either a visible line or a digital signal. The readout therefore depends on both the presence of hCG and the test’s ability to detect it, linking an antibody-based interaction to a practical result.
Testing too soon and using diluted urine are identified sources of false-negative results. Early in the process, hCG may not yet have risen to a detectable level after implantation. Dilution can also reduce the hormone concentration in the sample, so the assay may fail to generate its expected signal despite an early pregnancy.
Laboratory blood tests can measure lower hCG concentrations than most home urine tests. This difference makes blood analysis useful when detecting smaller amounts of the hormone is important, whereas home urine testing offers a rapid, noninvasive approach. The choice therefore affects the sensitivity available for identifying hCG, particularly when concentrations are still low.
These assays provide an early indication that can help identify pregnancy and support timely clinical care. Their value comes from combining a biologically meaningful marker, hCG, with rapid testing formats that can be used without invasive sampling at home. In reproductive biology, this connects hormone production after implantation with decisions about follow-up and care.
hCG links a biological event with a measurable laboratory signal: its production begins after an embryo implants in the uterine lining, and its concentration rises afterward. That pattern allows testing to detect pregnancy through urine or blood, with blood assays capable of measuring lower concentrations. The marker therefore supports identification during the early period after implantation.