|Embryology - 25 May 2019 Expand to Translate|
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The pregnancy test represents the first of the prenatal diagnostic tests. Through history there were a number of supposedly diagnostic tests to determine early pregnancy, the most obvious was the absence of an ongoing menstrual cycle in women of reproductive age. It was not until the early 20th century that the first clinical maternal urine test was developed. A complicated test requiring analysis of changes induced in the immature mouse genital system by hormones present in the maternal urine. The test was replaced by a urine test with either the rabbit (Friedman modification) showing similar changes or frog (Xenopus), that could be induced to lay eggs by similar urine effects. In the 1960's an immunological test for human chorionic gonadotropin (hCG) in either maternal urine or blood led to development in the late 1970's of home pregnancy kits that became simple one step tests in the late 1980's.
Note that there are a number of pathological conditions, such as endocrine tumours and hydatidiform moles, that can also mimic the detected hormonal changes.
- Links: menstrual cycle | Week 2 | implantation | placenta | Pregnancy Test | hydatidiform mole | hCG
Some Recent Findings
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This table allows an automated computer search of the external PubMed database using the listed "Search term" text link.
<pubmed limit=5>Pregnancy Test</pubmed>
- 1928 - Bernhard Zondek and Selman Aschheim procedure that measured the increase in gonadotrophic substance in the urine of a pregnant woman.
- Immature mice injection with urine led to ovarian changes after a few days.
- Xenopus clawed frog replaced mice, injection with urine stimulated the females to lay eggs that were easily seen the next day.
- 1960s - immunological tests for chorionic gonadotropin.
- 1972 - Research on hCG at NIH by Judith Vaitukaitis and Griff Ross.
- 1978 - USA first home pregnancy test kits available.
- 1988 - first “one step” test, Clearblue Easy, a blue stripe appeared to indicate pregnancy.
In 1928 Bernhard Zondek and Selman Aschheim developed a procedure that measured the increase in gonadotrophic substance in the urine of a pregnant woman. Immature mice were injected with women's urine that led to ovarian changes after a few days. A later development was replacing mice with the Xenopus clawed frog where injection with urine stimulated the females to lay eggs that were easily seen the next day.
Aschheim-Zondek Test (1928)
Xenopus clawed frogs
Judith Vaitukaitis and Griff Ross (c1971)
Pregnancy Testing in Medicine
The urine test can be an indicator of an existing pregnancy, but does not exclude a pregnancy that has not reached the implantation stage, or even a very early adplantation stage (GA week 3). This test is often used in consultation with information on sexual history and the menstrual cycle, the last menstrual period (LMP).
There are a number of medical procedures and medications that are contraindicated for pregnant women. This can form part of a discussion or screening process prior to the procedure or prescription. This is also an issue in some medical procedures on women of reproductive age that require anaesthesia, see also UK NICE Guideline - section 5.18). A second issue relates to the preoperative pregnancy testing of minors, regulations for this circumstance may differ between countries.
A immunoradiometric assay for human chorionic gonadotropin (hCG) in urine identified that 10% of clinical pregnancies were undetectable on the first day of missed menses. The same test 1 week after the first day of the missed period, the test identified 97% of clinical pregnancies.
- Links: Menstrual Cycle | Abnormal Development - Drugs | Australian Drug Categories | USA Drug Categories
- Aschheim S. and Zondek B. The diagnosis of pregnancy from the urine by demonstration of the hormone of the pituitary body. (1928) Klin. Wschr., 7: 1401.
- Friedman MH. Mechanism of ovulation in the rabbit: II. Ovulation produced by the injection of urine from pregnant women. (1929) Am J Physiol. 90:617-622. PDF
- Vaitukaitis JL. (2004). Development of the home pregnancy test. Ann. N. Y. Acad. Sci. , 1038, 220-2. PMID: 15838116 DOI.
- Tepper NK, Marchbanks PA & Curtis KM. (2013). Use of a checklist to rule out pregnancy: a systematic review. Contraception , 87, 661-5. PMID: 23040127 DOI.
- Donaldson JF, Napier SJ, Ward-Jones M, Wheeler RA & Spargo PM. (2012). Checking pregnancy status in adolescent girls before procedures under general anaesthesia. Arch. Dis. Child. , 97, 895-9. PMID: 22447994 DOI.
- Kaplan HE. The Aschheim-Zondek hormone test for pregnancy. (1929) Cal West Med. 31(6): 412-413. PMID18741243
- Apfelbaum JL, Connis RT, Nickinovich DG, Pasternak LR, Arens JF, Caplan RA, Connis RT, Fleisher LA, Flowerdew R, Gold BS, Mayhew JF, Nickinovich DG, Rice LJ, Roizen MF & Twersky RS. (2012). Practice advisory for preanesthesia evaluation: an updated report by the American Society of Anesthesiologists Task Force on Preanesthesia Evaluation. Anesthesiology , 116, 522-38. PMID: 22273990 DOI.
- Wilcox AJ, Baird DD, Dunson D, McChesney R & Weinberg CR. (2001). Natural limits of pregnancy testing in relation to the expected menstrual period. JAMA , 286, 1759-61. PMID: 11594902
Gronowski AM, Cervinski M, Stenman UH, Woodworth A, Ashby L & Scott MG. (2009). False-negative results in point-of-care qualitative human chorionic gonadotropin (hCG) devices due to excess hCGbeta core fragment. Clin. Chem. , 55, 1389-94. PMID: 19395437 DOI.
Catt KJ, Dufau ML & Vaitukaitis JL. (1975). Appearance of hCG in pregnancy plasma following the initiation of implantation of the blastocyst. J. Clin. Endocrinol. Metab. , 40, 537-40. PMID: 1117063 DOI.
External Links Notice - The dynamic nature of the internet may mean that some of these listed links may no longer function. If the link no longer works search the web with the link text or name. Links to any external commercial sites are provided for information purposes only and should never be considered an endorsement. UNSW Embryology is provided as an educational resource with no clinical information or commercial affiliation.
- USA - NIH A thin blue line - The History of the Pregnancy Test Kit | Timeline
- USA - Womens Health http://womenshealth.gov/publications/our-publications/fact-sheet/pregnancy-tests.cfm#a Pregnancy tests fact sheet]
- Australia - NSW Health Pregnancy
- UK - National Health Service (NHS) National Institute for Clinical Health and Excellence (NICE) Preoperative Tests The use of routine preoperative tests for elective surgery guidelines. PDF
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Cite this page: Hill, M.A. (2019, May 25) Embryology Pregnancy Test. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Pregnancy_Test
- © Dr Mark Hill 2019, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G