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Problems about accuracy of pregnancy tests - Online Doctor Chats

Date : 21-Feb-2012
User rating for this question
Good Posted in: Pregnancy
Answered by

General & Family Physician
Practicing since : 2009
Answered : 681 Questions
User :   Hi there im 26 and have had 2 ectopics and 2 healthy pregnancies, im now 8 days late for my period and have had 3 negative hpts but i am having symptoms of pregnancy which ive had with all my pregnancies. Could i still be pregnant??
Doctor :   Hi
User :   Hi
Doctor :   let me read ur query
Doctor :   may i know when was the last HPT done ?
User :   this morning
Doctor :   Usually HPTs have a sensitivity of 98%
Doctor :   this means they are fairly accurate
Doctor :   since 3 tests have been negative, the chances of u being pregnant could be less
Doctor :   and the chances of you having either a delayed period or a missed priod may be high
Doctor :   The best way, here is to get a blood test done to check the serum HCG levels , which will give a 100% clear picture
User :   im trying to conceive at the moment and am using the clearblue fertility monitor so i know when i ovulated which was the 18th of janruary and me and my husband had intercourse that night. Is there a chance that i coulld be pregnant and it is ectopic and thats why its not being detected by the hpts?
Doctor :   any preganncy will cause increase in HCG levels that are detected by the HPT
Doctor :   but almost six percent of negative urine pregnancy tests can be false negative, meaning the women is indeed pregnant despite a negative urine pregnancy test.
Doctor :   so you may benefit by doing a blood preg test
Doctor :   are u there ?
Doctor :   Have you understood my advice ?
User :   yes i will see if i can get a blood test arranged. should i just leae it a few days first and see if aything happens over the next few days?
Doctor :   yes u can do that
Doctor :   since you want to get pregnant, there is no issues with waiting for a few days
User :   ok then thank you.
Doctor :   you can relax and take your time
Doctor :   You are welcome
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