It s not common but sometimes this effect leads to urine and blood tests giving the wrong result.
Pregnancy blood test negative.
There may be many different reasons for a negative pregnancy test after a missed period.
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.
Even with the most sensitive blood test it is still possible to be pregnant with a negative test.
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.
There is a lot of confusion an ambiguity about blood pregnancy tests.
In this the test becomes negative because of very high concentration of hcg.
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.
Typical cutoffs for positive blood tests for pregnancy are 5 10 and 25 units.
Just like home pregnancy tests labs vary in what is considered a positive pregnancy test.
However if the test was performed too early in the pregnancy before your body has had time to produce enough hcg you.
You may be.
False negative results on a blood pregnancy test may also result due to a high dose hook effect.
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.
A false negative test is negative but you re pregnant can occur if the blood pregnancy test was performed too early.
This may occur especially in molar pregnancy although more common finding is a falsely low value of hcg rather than a completely negative test.
Blood tests are much more precise and can tell you the exact number of hcg miu ml in the blood.
As with urine home pregnancy tests it is possible to end up with false results both negative and positive from a blood pregnancy test.
One explanation for a false negative pregnancy test is what s called the hook effect.
In this article we explain how the menstrual cycle works and provide some.
