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A member asked:

I had hcg blood test and it was a negative after 1 month of sex... how valid are blood tests? can they ever tell me that i'm not pregnant when i'm not

A doctor has provided 1 answer

Time & technique: Both urine and blood tests for HCG are very accurate in measuring hcg. It is better to do either test 4-5 days after a missed period. Negative pregnancy test done after one month of the last episode of sex is a good indication that the person is not pregnant. You should repeat the test 7-10 days later for an added measure.

Answered 4/2/2016

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Hi, I'm currently on Mirena for 3 1/2 yrs now, my period is stable every 3 to 4 weeks but never late, now I'm almost 3 weeks late with one positive pregnancy test when i was 10 days late and a negative blood test(1.2 beta hcg ), internal ultrasound not sh

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Last period was Aug 25th! Been 4 weeks and 2 days since last sex encounter. Did a blood hcg test yesterday and came back negative. The level was <1 so it was below 5. Is it accurate enough to rule out pregnancy?

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