What happens if the urine test is positive but the blood test is negative?

Both blood and urine tests test for the presence of the pregnancy hormone but blood tests can measure the levels of the hormone in the blood and are therefore more accurate. The best thing to do is to do another test and see what the result is. There may be many reasons why the test results are different, including:

• False positive result: a false positive result occurs when the test says you are pregnant but in reality you are not. This may happen as a result of taking fertility medication, which contains the pregnancy hormone.
• Qualitative blood test: the results of the qualitative blood test may be altered if you have been taking diuretic medications; if this is the case it may take longer to get an accurate result as the concentration of the HCG in the urine will be lower.
• Quantitative blood test: the results of two tests may be different following an abortion, ectopic pregnancy or miscarriage; this is because the HCG remains in the body for a period of time after the baby has been lost so a home test may detect the HCG and give a positive result.

FAQ:

Pregnancy Testing FAQs

• Q1. How soon can I get an accurate result?
• Q2. What happens if the urine test is positive but the blood test is negative?
• Q3. Can blood tests be wrong?
• Q4. What are the common signs of pregnancy?
• Q5. How common are false positive results?
• Q6. When can I do a pregnancy test if I’ve had fertility treatment?
• Q7. How do home pregnancy tests work?
• Q8. Is a blood test more reliable than a home urine test?
• Q9. What does a faint line mean?
• Q10. Why is my period late if I’m not pregnant?

• Q11. Will using contraception alter the result of a fertility test?
• Q12. How do I do a home pregnancy test?
• Q13. How common are false negative results?
• Q14. How soon can I take a pregnancy test after a positive result from an ovulation test?
• Q15. Can I do a pregnancy test before my period is due?
• Q16. What should I do if my test is positive?
• Q17. Do drugs and medication affect pregnancy test results?
• Q18. What should I do if I have pregnancy symptoms but my test was negative?