If I Had A Hcg Shot, When Can I Take A Pregnancy Test And Get Accurate Results?

Human Chorionic Gonadatropin (hCG) is one of the hormones most commonly associated with pregnancy. It is the hormone that pregnancy tests test for. Some tests are more sensitive than others are, although not all tests show the minimum hCG level measured on the box when you purchase it. The lowest level of hCG that a pregnancy test will measure is 25 mIU/mL. As a pregnancy goes on, the hCG levels increase, doubling every 48-72 hours. Thus, the further along a woman’s pregnancy is, the more likely her hCG levels will register on a pregnancy test.

There is an old question about whether a person can get a “false negative” or a “false positive” on a pregnancy test. As above, a false negative certainly is possible if the hCG levels are too low to register on the pregnancy test. If a woman has not gotten her regular period and the pregnancy test registers as negative, the woman is encouraged to re-test in a few days. Because hCG levels are usually only associated with pregnancy (and to a lesser extent, a woman’s menstrual cycle), the conventional wisdom is that a false positive on a pregnancy test is nearly impossible.

Here is where the conventional wisdom fails: hCG is sometimes administered as an injection to help women with fertility challenges. It is said to trigger ovulation and to lengthen the luteal phase of her cycle so that she will have a higher chance of conceiving. Lack of ovulation is a common reason for a couple being unable to conceive, so it is seen as something that can be quite helpful in a couple’s fertility quest.

Unfortunately, if a woman has gotten an hCG shot, her blood and urine hCG levels will likely reflect the hCG that she’s had injected, rather than the hCG from her potential new pregnancy. So it is possible for a woman who is not pregnant to get a positive result on a pregnancy test if she’s recently had an hCG shot.

So if you have had the shot, how will you know if you are pregnant or not?

The first method is the old fashioned pioneer woman method: waiting to see if your period comes when it is supposed to. This is not satisfying at all, and will likely take all the patience you have, especially knowing that pregnancy tests are available, but won’t work for you.

If you need to find out sooner, you can do some math and figure it out. hCG has a half-life of 28 hours in your body, which means that your hCG levels should decrease by half every 28 hours. There are three injection amounts; 10 000 IU, 5000 IU, and 2500 IU. If you have had the 10 000 IU shot, you’ll need to wait for at least 14 days after the shot to take the pregnancy test; the 5000 IU test will have you waiting 10 days, and a week’s wait for the 2500 IU shot.

Your last option would be two quantitative blood tests at the doctor’s office, taken a few days apart in order to see if your hCG levels are increasing or decreasing.

Each person’s journey to fertility is different; for some women that journey involves an hCG shot. It may be the therapy that works, but you will have to wait to find out.

  • Samantha

    I was taking hcg weight loss shots every other day for two months then I had a positive pregnancy test the doctor told me to stay off the shots for 72 hrs before testing again I’m now 8 weeks and counting

  • Deisi

    I took a choragon shot March 8th its now march 23 rd I have three positive pregnancy tests Hoping its true

  • Shivani Sharma

    Hi I m 38 and had my hcg trigger shot on the 27 th Oct it’s been now 10 days, I feel heavy n bloated still, Does anyone know how long do false pregnancy symptoms persists, this wait I’d dreadful :-(

  • http://www.babyhopes.com/ Vickie B.

    It really depends on the level of hcg shot you had.

    From this page:

    “There are three injection amounts; 10 000 IU, 5000 IU, and 2500 IU. If you have had the 10 000 IU shot, you’ll need to wait for at least 14 days after the shot to take the pregnancy test; the 5000 IU test will have you waiting 10 days, and a week’s wait for the 2500 IU shot.”

  • Ronika

    i have had injection hcg 10,000 IUon 16.0215.Now i had very pain in my legs ,feet and back.What is the reason

  • http://www.babyhopes.com/ Vickie B.

    Unfortunately, I am not a doctor so I don’t know. You might want to talk to your doctor about that.

  • Ashley

    I have only had one HcG shot and it was yesterday.. It’s a 0.25ml shot..since mid feb I have had weird feelings and thought I was preg since my hubby and I are trying to conceive .. But I took it for weight loss. Is that enough to give me 3 faint positive pregnancy tests last night..I had a faint one before I even took the shot as well. Please help

  • http://www.babyhopes.com/ Vickie B.

    I don’t know what the concentration of hcg was in your shot. If you had positive before the shot though, you are probably pregnant. I am not sure how long it will take the shot to leave your system, but I’d test again in a week to see if you are still getting positive pregnancy tests.

  • Ashley

    Okay so week one done of hcg diet shots.. I didn’t take any Saturday / Sunday . Friday I felt off took a clear blue while on the shot and neg. Monday morning I used fmu to take a first response and clear blue, first response came out bright positive and clear blue neg. this morning another bright positive from first response. I had horrible nausea and small stomach cramps at 5am this morning … I’m confused with the positive and negatives. My period is 4 days away but my hubby and I DTD during fertile time and ovulation day… So I’m not sure what’s happening, I’m so bloated too even with dieting

  • Ashley

    Was that your first positive test in the two months taking it

  • http://www.babyhopes.com/ Vickie B.

    Well, I am not sure due to the fact that you are taking the hcg shots. It would appear that you are pregnant, but you can’t be sure. Have you stopped taking the shots? Also, just in case, you should probably not be following the severely restricted calorie intake that is typically seen with the hcg diet until you know for sure.

Last modified: June 8, 2014

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