How Early Pregnancy Can Be Detected By Pregnancy Tests?

by admin on October 9, 2010

Pregnancy tests are used to detect HCG – Human Chorionic Gonadotropins hormones in the body, which usually comes after implantation of fertilized egg in uterus, which takes place after 10-12 days after ovulation.

HCG first comes in blood, so it is detected earlier in blood serum, than urine, so even a small rise in HCG can be detected long before it comes positive in urine. Pregnancy tests are detected very early by following serum tests.

1. RIA (radio immuno assay): this is the best test as it decets pregnancy very early when HCG amounts are very small in range of 0.001 to 0.002 IU/ml. It detects pregnancy as early as 8-9-10 days after ovulation i.e on 25 th day of menstrual cycle.

2. ELISA : it comes positive around 5 days before the missed periods which can detect 1-2 mIU/ml of HCG in urine.

3. IRMA: it can detect HCG at 0.05mIU/ml and it comes positive after 8 days of implantation.

all of these 3 tests are serum tests.

Urine Tests To Detect Pregnancy

Card Tests: now a days so many cards are available in market, which detects urine HCG, and for this test to be positive around 30-50 mIU/ml of HCG should be present in urine. This test usually comes positive on very first day of missed period.

HCG Pregnancy Kit

Picture Credits Anqua At Flickr under Creative Common Liscense

There are 2 other tests like Latex test and Direct Latex agglutination test which come positive after 2-3 days of missed periods.

Note: Accuracy of urine test can be effected by albumin in urine, leutinizing hormone, and presence of haemoglobin in urine. Collection of urine should be done in clean containers, which should not be washed by soap.You have to take very first morning sample of urine.

For Further Reading :


{ 2 comments… read them below or add one }

Sarita January 9, 2011 at 1:41 pm

Hi had intercourse with my Boyfriend on 02nd Jan 2011, Kindly tell me how can I check pregnancy..I am pregnant or not. as i am not getting my period.


Avarna February 22, 2012 at 4:57 am

Hi Sarita,
I think its better to do one urine pregnancy test,which help you to know the result immediately.I think these kit is available in all pharmacy and main supermarkets I think.


Leave a Comment


Previous post:

Next post: