Certain Factors May Interfere With Some Home Pregnancy Test

5 Replies
Mel - February 17

• For accurate results patients must follow the manufacturer’s instructions explicitly. Improper procedure can cause a false-positive or false-negative result. • Expired tests can give unreliable false readings. • Home pregnancy tests can exhibit false-positive results in menopausal women. High levels of luteinizing hormone (LH) may cause a false-positive result. Menopausal women should have blood tests done to confirm pregnancy. • The pregnancy hormone HCG is most concentrated in the first urine specimen of the day. A dilute urine can cause a false-negative result. If a woman is on a diuretic this could affect the concentration of the urine. • Tests kits with urine collection cups (2-step methods) require that the patient use the cup provided. Soap or detergent residues in another container may interfere with the test. • A false-negative result could occur if the test is performed too early in gestation. Pregnancy tests can detect HCG one day after missed menses. Testing too late in gestation can also cause a false-negative result. HCG levels in the urine decrease 4 months into the pregnancy. • Medicines that contain HCG (e.g., Pregnyl, Profasi, A.P.L.) can cause a false-positive result. • Pergonal could affect certain home pregnancy tests (e.g., First Response, EPT, Answer Quick and Simple, Answer) causing either a false-positive or -negative result. • A recent birth can cause a false-positive result. HCG levels may still be present in the urine. • Tests performed following miscarriage or abortion may exhibit a false-positive result. Tests may remain positive for up to 7 weeks after an abortion. • Ovarian cysts or a recent ectopic pregnancy may cause a false-positive result. • Ectopic production of HCG by nontrophoblastic tumors can cause a false-positive result.

 

Mel - February 17

Just thought this was useful information. The site I got it off of is: http://www.uspharmacist.com/oldformat.asp?url=newlook/files/Feat/ACF3003.cfm&pub_id=8&article_id=135

 

Mel - February 17

Without all the dashes sorry : )

 

Mel - February 17

Falsely low or false negative results can occur when an extremely high level of substrate overwhelms the a__say system i also found this but i have know idea what it means if anyone could help me out

 

jiji - February 22

bump

 

ANG - July 3

I HAD MY PERIOD. COULD I STILL BE PREGNANT?

 

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