Answered by The Community. Making the world better, one answer at a time. Auricles are the two upper chambers of the heart divided into right auricle and left auricle.Right auricle always contains deoxygenetated blood (blood mixed with carbon dioxide) and left one has the oxygenetated blood.he two types of the blood do not get mixed up as the two auricles are separated from one another by an interauricular septum.
False negative results (test is negative, but you are actually pregnant) usually occur if the blood pregnancy test was performed too early (a rule of thumb is that it takes at least 7 days after conception for the test to show a positive result).
A blood test can also detect hCG. Blood tests are more sensitive than urine tests and can detect pregnancy from about six to eight days after ovulation. However you will not be offered a blood test for pregnancy until after your period is due, and even then only if there is a medical need.he lower the number, the more sensitive the test, and the earlier it can detect pregnancy. If you test too soon in pregnancy, even with a sensitive test, the amount of hCG in your urine may not be high enough to detect. Getting a false negative, when a test that says you're not pregnant and you are, can be stressful.