inaccurate blood test readings

[kyliejnorman011]

my blood test came back stating i was 4 to 5 weeks pregnant 3 weeks ago I had a ultrasound performed 1 week ago There was no baby visible I the reported to my doctor whom ran further tests on me and she said Yesterday that I am only 5 weeks pregnant is it normal to have inaccurate blood ? so am i really 5 weeks Im unsure if i should believe these results

[JoyRenee]

A blood test does not tell you how far along you are. It only tells if you are pregnant or not.

[AnnieBrooke]

A blood test simply does not and cannot say you are 4 to 5 weeks pregnant.  It only gives a number, of the amount of hCG in your blood.  Those numbers are, as Clysta says, all over the map for women in early pregnancy.  I know a woman who was pregnant with twins and at 4 weeks her hCG was 75, and another who was also pregnant with twins whose number at 4 weeks was 430.  You can't tell, and whoever claimed a blood test could tell you how far along you were was giving you very poor information.  Get an ultrasound in about two more weeks, and ask them to tell you by the crown to rump measurement exactly how far along they think you are, counting both the medical way (from the presumed first day of your last period) and also counting from the presumed conception day.  Good luck!

[Clysta]

Blood tests are not accurate to determine pregnancy. There is a wide range of "normal" and many women can fall outside of these. Ultrasound is the only way to determine gestational age.