What Can Cause a Faint Positive on a Pregnancy Test?

After pregnancy, human chorionic gonadotropin (HCG) is secreted by placental chorionic trophoblast cells, which peaks at 60-70 days, and then gradually decreases, maintaining until after delivery. The detection of human chorionic gonadotropin in the urine of pregnant women provides a basis for pregnancy and helps diagnose certain diseases, such as hydatidiform mole, chorionic carcinoma, and testicular teratoma.

Name: Pregnancy test

category: Pee

Normal pregnancy test

Rapid latex agglutination inhibition method: negative (non-pregnant women).

Double antibody sandwich enzyme immunoassay: negative (non-pregnant women).

Immuno gold sol spot filtration method: negative (non-pregnant women).

Clinical significance of pregnancy test

Rapid latex agglutination inhibition method: It is mainly used for the detection of 5-6 weeks of pregnancy, and can be positive in more than 90%: hydatidiform mole, chorionic epithelial cancer, ectopic pregnancy can also be positive; stillbirth and abortion can be positive after 1-2 weeks Is negative.

Double-antibody sandwich enzyme immunoassay: It is mainly used for the detection of early pregnancy, and it can be positive in early pregnancy. The other clinical significance is the same as the rapid latex aggregation inhibition method.

Immuno gold sol spot filtration method: mainly used for the detection of early pregnancy (7-8 days of conception), other clinical significance is the same as rapid latex aggregation inhibition method.

Precautions for pregnancy tests

(1) Place the urine in a dry and clean container for inspection. Women with more leucorrhea may prefer mid-range urine. Among them, when the double-antibody sandwich enzyme immunoassay is used, if the menopause exceeds 40 days, the urine should be diluted 1: 5 before the measurement. (2) In the urine of patients with hydatidiform mole, chorionic carcinoma, and testicular teratoma, the human chorionic gonadotropin content is significantly higher than that of normal pregnant women. The urine can be highly diluted and then the rapid latex agglutination inhibition method can be used. test. Still positive, can be used as a differential diagnosis. (3) In addition to normal pregnancy, those with late or incomplete abortion and the placenta still remaining can also make the rapid latex agglutination inhibition test positive. Those who have no placenta after the abortion of the abortion can turn negative. In the case of twin pregnancy or combined pregnancy poisoning, the rapid urine latex agglutination inhibition test after diluting the original urine is still positive, but the dilution is generally not very high. (4) When the content of human chorionic gonadotropin in the urine is low, insufficient rapid latex agglutination inhibition test shows a positive response, and the human human chorionic gonadotropin can be concentrated 30 times and 60 times. The sensitivity can be improved. It is mainly used to observe the curative effect of hydatidiform mole removal or choriocarcinoma, to explain the completeness of treatment and whether there is recurrence.