If you are pregnant and your blood work says further along than ultrasound which one is more accurate?

An ultrasound is typically considered more accurate than blood work in determining the gestational age of a fetus.

Blood tests measure the levels of certain hormones, such as human chorionic gonadotropin (hCG), that are produced during pregnancy. While these hormone levels generally increase as pregnancy progresses, they can be affected by a number of factors, including the woman's individual health and the presence of certain medical conditions. This means that blood tests may not always provide an accurate estimate of gestational age.

On the other hand, ultrasound uses sound waves to create images of the fetus and its structures, such as the gestational sac, yolk sac, and fetal pole. By measuring the size and development of these structures, an ultrasound can provide a more precise estimate of gestational age. Additionally, ultrasound can provide valuable information about the fetus's health and development, including the presence of any abnormalities.