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What Ways can Drugs Affect Pregnacy Test Result

By Shruti Deshmukh , Onlymyhealth editorial team / Jun 14, 2011
What Ways can Drugs Affect Pregnacy Test Result

Some drugs can interfere with pregnancy test results. Be extra cautious if you are on fertility treatment, medications that contain hCG can manipulate the result of test.

Quick Bites
  • Fertility drugs containing hCG interferes with home pregnancy test results.
  • Even drugs used in combination with hCG may give false positive results.
  • Kits detect the levels of “human chorionic gonadotropin” levels.
  • One should re-take the test after the drugs go out of the system.

If you are on any kind of drug, be it prescription drugs or not, there could be a chance that you are on the edge of danger when it comes to pregnancy. Drugs could affect your pregnancy in more than one way.


Can Drug Use Affect Pregnancy Test

These days, many over-the-counter pregnancy testing kits are available in the market. These kits are generally 97% accurate and cheap and hence are preferred by many women to detect pregnancies. These kits work on the principle of detecting the levels of the hormone “human chorionic gonadotropin” (hCG) either in blood or urine sample. This hormone is produced by the placenta shortly after the embryo attaches to the uterine lining and builds up rapidly in the body in the first few days of pregnancy, thereby making its levels an indicator of pregnancy.


Drug and Pregnancy Test Results

Studies indicate that there are very few drugs / medications that affect the results of pregnancy test - either positive or negative. Birth control pills and other forms of birth control do not affect the results of pregnancy tests, i.e. you should get accurate results on pregnancy test results even if you are on oral contraceptives. The hormones in the pill do not cause a false positive (indicating pregnancy when you are not) or a false negative (not indicating pregnancy when you are) result.


However, fertility drugs / medications containing hCG may interfere with home pregnancy test results. E.g. use of drugs containing hCG, used in conjunction with infertility treatments, may give a false positive result of pregnancy, meaning a positive pregnancy result when actually you are not pregnant.


In such case, it is advised by the doctor to not to take a pregnancy test until these medications are completely out of the system (body).


Harmful Drugs

Certain drugs such as clomiphene citrate interfere with ovulation test results – generally in the form of a false positive. It generally causes a false positive only in case an ovulation test is taken too early of the menstrual cycle. Hence, drug manufacturers generally suggest to not to take test with the ovulation predictor kit until several days after the last dose of clomid.

Certain drugs containing or used in combination with hCG drugs may also give false positive results if the test is performed within 7-14 days of last dose of the drug.

Drugs (analgesics and antibiotics), narcotic drugs (cocaine, marijuana, and heroin) and alcoholic drinks do not alter the result of a home pregnancy test, but it is advisable to not to take test under the influence of these drugs.


A home pregnancy test can give you a nearly accurate result by measuring the hCG level in the urine, in case you are not using drugs that can manipulate the test result. 


Read more articles on Pregnancy Test.

Written by
Shruti Deshmukh
Source: Onlymyhealth editorial teamJun 14, 2011

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