What medications can cause a false negative pregnancy test?

What medications can cause a false negative pregnancy test?

Medications that could affect your test include benzodiazepines, phenothiazine, promethazine and others. Urine contaminated with blood or protein can also trigger a false positive.

Can PCOS cause a false negative pregnancy test?

Your hormone levels are irregular when you have PCOS, so false negatives are definitely possible. You may attempt to test for pregnancy shortly after your missed period and get a negative result even though you’ve conceived.

What can cause multiple false negative pregnancy tests?

However, below are some reasons why a home pregnancy test can show a negative result when you are, in fact, pregnant:

• Completing a test too early. This is one of the most common reasons for a false negative test.
• Irregular cycles.
• Ectopic pregnancy.
• Breastfeeding.
• Expired or mishandled test.

What causes hCG not to show up in urine?

In addition to testing too early, the following factors can cause a false negative with a urine HCG test: drinking lots of water so that the urine is very diluted. getting too much or too little urine on the test strip. testing with urine late in the day when it may be weaker.

Can drugs affect a pregnancy test?

Most medicines should not affect the results of a home pregnancy test. This includes over-the-counter and prescription medicines such as birth control and antibiotics. Also, alcohol and illegal drugs do not affect pregnancy test results.

Can metformin affect hCG levels?

Result(s): The number of follicles > 15 mm in diameter on the day of hCG administration was significantly lower in cycles performed after metformin treatment. The percentage of cycles with hCG withheld because of excessive follicular development was significantly lower in cycles treated with metformin.

How likely is false negative pregnancy test?

Home pregnancy tests are usually accurate, but researchers estimate that up to 5% of tests give a false negative — meaning the test says you aren’t pregnant when you actually are. There are a few reasons why you might get a false negative. You might be taking the test too early or after drinking too much water.