Maternal Expert Forum
determining pregnancy- irregular cycles.
About This Forum:

Patient medical question and answer from The Maternal and Child Health Forum. Health topic area and articles about newborn care

Font Size:
A
A
A
Background:
Blank
Blank
Blank
This expert forum is not accepting new questions. Please post your question in one of our medical support communities.
Blank Blank

determining pregnancy- irregular cycles.


  
      PLEASE CLARIFY THIS.
     Do htp results vary according to a women's cycle?
     I have read that they are accurate:
     3 days after a period is due (this can vary from woman to woman)  
     and i have read that they are accurate:
     @ 17 days after conception....
     WHICH IS TRUE??
    
     If the later is true, that would imply a woman with an irregular
     cylce could test early... if the first is true, then a women with
     an irregular cycle is all but lost!
      My lmp began feb 14th.. I am often somewhat irregular but average
      28-31 days.  Today is day 32, four days past a normal woman's cycle.
      I went for a lab (urine) test yesterday
      which was Negative... I took an HPT today, also Neg.
      Am i testing too soon?  Date of conception would have been 3/1.
      Which means, I am 17 days past conception... but Not neccesarily three
      days late.  Which is why i ask you to clarify the above.
      Also, i took my First AM urine and refrigerated it, then took the
      hpt later.  Can temp affect the test?
        
      Thanking you in advance for your time!!!!!!
Related Discussions
Avatar_n_tn

_
Dear Questioner:
There is a standard menstrual cycle: it is 28 days long and ovulation occurs on the 14th day. Whenever any reference is made to tests being done "one day after the missed period", the ASSUMPTION is that the cycle is this perfect, textbook-defined cycle. Real women are rarely like this.
In reality, for most women, ovulation has a range of approximately 3 days from menstrual cycle to menstrual cycle. Furthermore, the second half of the menstrual cycle can be as short as 10 days and as long as 16 days, within a 28 day long cycle.
Ovulation occurs! The egg is fertilized within 1 day. The fertilized egg resides in the fallopian tube for 3-5 days. It then moves into the uterus and by the 7th day after ovulation it is attaching into the uterine lining. As the early embryo grows in the uterine lining, it secretes hCG into the blood stream of the woman to signal the corpus luteum in the ovary to continue to make progesterone.
Depending on how much hCG signal is secreted determines how soon the blood level is high enough to be detected by a blood pregnancy test. How much of the hormone is available to be cleared into the urine determines how quickly a urine pregnancy test becomes positive.
Working rules: a blood pregnancy test that is negative 14 days after ovulation and a urine pregnancy test that is negative 17 days after ovulation is giving reliable information: the lady is not pregnant. Tests in ladies that are pregnant may be positive earlier than these time points, but a negative test at an earlier time point is not reliable.
When a woman has an irregular cycle and does not know when she ovulated in a given cycle, there is no scientific way to know when to do a test. My advice, wait 3 days beyond the longest cycle length (from what you describe, that would be cycle day 34.
I do not know if temperature affects the test kit which you used. Temperature does change many test kit reactions. If the test kit instructions request a fresh urine sample, than the bacterial action on proteins in the urine and refrigeration must be assumed to influence the test result.
Keywords: urine pregnancy test, irregular cycle
This information is provided for education purposes and is not a medical consultation. If you have specific questions, please speak with your healthcare provider.





0 Comments
Blank
Avatar_n_tn
Continue discussion Blank
MedHelp Health Answers
Blank
Weight Tracker
Weight Tracker
Start Tracking Now
RSS Expert Activity
233488_tn?1310696703
Blank
New Cannabis Article from NORTH Mag...
Jul 20 by John C Hagan III, MD, FACS, FAAOBlank
242532_tn?1269553979
Blank
3 Reasons Why You are Still Binge E...
Jul 14 by Roger Gould, M.D.Blank
242532_tn?1269553979
Blank
Emotional Eating: What Your Closet ...
Jul 09 by Roger Gould, M.D.Blank