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Midlothian, VA
A 31-year-old female asked:

when will a blood test show positive? we've been trying for 4 months to get pregnant. i took a test on friday at the doctors office. it was negative.

1 doctor answer2 doctors weighed in
Dr. Robert Killian
General Practice 28 years experience
Missed Period: It will show positive when you are pregnant and enough days have passed after the baby is conceived for it to be big enough to have a placenta, chemicals and blood that your body can detect. Usually you test AFTER a period is missed, not before.

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Similar questions

A 20-year-old member asked:

How soon can a blood test show you are pregnant ?

2 doctor answers2 doctors weighed in
Dr. Steven Bowers
Internal Medicine 33 years experience
Varies: Within several days of conception, certainly within 2 weeks your body begins to produce enough of the hormone we test for to know that you have conceived. At that point other tests as well as passage of time are needed to confirm whether the pregnancy is normal and viable.
Revere, MA
A 24-year-old female asked:

What is the hook effect in regards to pregnancy testing and why does it occur? Would it effect a blood test?

2 doctor answers3 doctors weighed in
Dr. Cornelia Franz
Specializes in Pediatrics
Yes: A very rare cause of false negative results occurs when very, very, high concentrations of HCG are present. This is called the high-dose hook effect. Urine and blood can be negative. Diluting the urine and/or getting an ultrasound can confirm pregnancy. http://www.pregnancylab.net/2011/05/false-negative-pregnancy-tests.html.
A 29-year-old member asked:

Can I have with lupusin pregnancy without the positive blood test?

1 doctor answer4 doctors weighed in
Dr. Gurmukh Singh
Pathology 49 years experience
Yes: A small number of patients with lupus do not have the usual laboratory test abnormalities, i.E, ANA negative lupus.
A 33-year-old member asked:

What does a bhcg blood test determine besides pregnancy?

1 doctor answer1 doctor weighed in
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 26 years experience
Used in several ways: Free beta HCG can be used for screening first trimester pregnancies for fetal aneuploidy (e.g. Down syndrome), to diagnose ectopic pregnancy, to monitor molar pregnancy response to treatment with chemotherapy and as a tumor marker for some rare malignancies.
A 26-year-old female asked:

What if u do a blood test and its negative but u feelin pregnant?

3 doctor answers10 doctors weighed in
Dr. Jon Ahrendsen
Family Medicine 39 years experience
Wait and repeat it: Best advice is to wait 1-4 weeks and then repeat it. If it is still negative you might consider seeing a doctor. There are different kinds of pregancy tests, and doctors can do qualitative tests that give a 'level' of the pregnancy hormone and not just a positive or negative result. Many women do skip periods at times. Some women have early miscarriages before they really know their pregnant.

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Last updated Aug 12, 2014
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