Hi,
HPT, could be false positive till some period after an
abortion, whether it is spontaneous or surgical. As in HPT, positive test denotes the presence of a minimum level of
HCG in the urine. It may take some time for this level of HCG, to come to such a low level, where it can not be detected in urine and hence giving a negative result.
This period may be some days or a few weeks, depending on the duration of
pregnancy, may be up to 5-8 weeks after abortion. Hence an HPT, should be considered true positive at least after 2 months of abortion. Also, if we want to confirm/rule out pregnancy, before this period, then HCG levels in the blood in two tests, at least taken one week apart may be taken for consideration. If these two tests are showing an increasing trend of HCG level in blood, then you may be pregnant. A decreasing level of HCG will show absence of pregnancy.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. Satnarain Bansal, General & Family Physician