There is a lot of confusion an ambiguity about blood pregnancy tests.
Pregnancy blood test negative.
One explanation for a false negative pregnancy test is what s called the hook effect.
If an hcg test comes back negative that generally means you re not pregnant.
In fact home pregnancy tests have a top limit of hcg that they can detect and when the levels in your urine rise above that top limit you can get a false negative.
False negative results on a blood pregnancy test may also result due to a high dose hook effect.
An hcg level of less than 5 miu ml is considered negative for pregnancy and anything above 25 miu ml is considered positive for pregnancy.
There may be many different reasons for a negative pregnancy test after a missed period.
Just like home pregnancy tests labs vary in what is considered a positive pregnancy test.
Blood tests are much more precise and can tell you the exact number of hcg miu ml in the blood.
A false negative test is negative but you re pregnant can occur if the blood pregnancy test was performed too early.
In this the test becomes negative because of very high concentration of hcg.
If you re pregnant with twins or triplets you can get a negative pregnancy test because your pregnancy hormones are too high for a standard hpt to detect.
A level under five is considered a negative result.
If the pregnancy test is negative a variety of conditions and factors may be responsible for the lack of menstruation.
It s not common but sometimes this effect leads to urine and blood tests giving the wrong result.
An hcg level between 6 and 24 miu ml is considered a grey area and you ll likely need to be retested to see if your levels rise to confirm a pregnancy.
In this article we explain how the menstrual cycle works and provide some.
This may occur especially in molar pregnancy although more common finding is a falsely low value of hcg rather than a completely negative test.
As with urine home pregnancy tests it is possible to end up with false results both negative and positive from a blood pregnancy test.
For example blood pressure drugs or allergy medications can throw off your cycle.
However if the test was performed too early in the pregnancy before your body has had time to produce enough hcg you.
