Medical Specialty >> Gynecology

Doctors Lounge - Gynecology Answers

Back to Gynecology Answers List

If you think you may have a medical emergency, call your doctor or 911 immediately. Doctors Lounge ( does not recommend or endorse any specific tests, physicians, products, procedures, opinions, or other information that may be mentioned on the Site.

DISCLAIMER: The information provided on is designed to support, not replace, the relationship that exists between a patient/site visitor and his/her physician. Please read our 'Terms and Conditions of Use' carefully before using this site.

Date of last update: 10/14/2017.

Forum Name: Obstetrics

Question: actual quantitaive test for hCG

 kspilker1982 - Thu Feb 26, 2009 2:00 pm

I am aware of the correct levels of hCG before, during, and after pregnancy. I also am aware that doctors usually conduct these tests by drawing blood or though a urine sample. However I would like to know how the levels are actually calculated. What mathematical method is actually being used?
 John Kenyon, CNA - Sun Mar 08, 2009 12:48 am

User avatar Hello --

The calculation of hGC has become largely computerized, and even though I've spent several years in lab, I don't know exactly how the calculation is set up, but do know this, which is probably the basis for the automated calculations: Beta hCG levels double roughly every 2 days during the first four weeks. As the pregnancy evolves, the doubling time increases. By 6 to 7 weeks gestation beta hCG levels may take as long as 3 1/2 days to double. If one were to put this information into a small program, I'm quite sure it would yield virtually the same results that laboratory calculator programs now do.

Hope this is an adequate answer. Probably someone out there remembers the actual formula for computing this, but so much is automated now in lab work that it's largely lost to most of us who now rely on computerized models to calculate the results.

| Check a doctor's response to similar questions

Are you a Doctor, Pharmacist, PA or a Nurse?

Join the Doctors Lounge online medical community

  • Editorial activities: Publish, peer review, edit online articles.

  • Ask a Doctor Teams: Respond to patient questions and discuss challenging presentations with other members.

Doctors Lounge Membership Application

Tools & Services: Follow DoctorsLounge on Twitter Follow us on Twitter | RSS News | Newsletter | Contact us