How can hcg levels go back up after miscarriage?

There are several reasons why hCG levels may go back up after a miscarriage.

1. Retained products of conception (RPOC): Sometimes, after a miscarriage, some tissue from the pregnancy may remain in the uterus. This is known as retained products of conception (RPOC). RPOC can continue to produce hCG, which can cause hCG levels to rise again after the miscarriage.

2. Ectopic pregnancy: An ectopic pregnancy is when a fertilized egg implants outside of the uterus, usually in the fallopian tube. Ectopic pregnancies can produce hCG, and if the ectopic pregnancy is not removed, hCG levels can continue to rise.

3. Gestational trophoblastic disease (GTD): GTD is a rare condition that occurs when the cells that normally form the placenta continue to grow after the miscarriage. GTD can produce hCG, and if it is not treated, hCG levels can continue to rise.

If you have experienced a miscarriage and your hCG levels are going back up, it is important to see a doctor to rule out any of these possible causes.