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Day 21 Blood Tests - does it matter when you ovulate?

3 replies

Bibi20 · 28/09/2004 14:52

Hi - looking for some advice please!

I'm going for day 21 blood tests next week, but was wondering whether it matters that I normally only ovulate on day 20 (I think).

My concern is that as a lot of doctor's suggest that you ovulate around day 14, is the day 21 test intended to find things that would only be in your blood 7 days after ovulation? In which case is there a chance that the test won't be any use if I'm only 1 dpo when they do it?

TIA

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prettybird · 28/09/2004 15:03

When I had the test done (before ds), I knew I had a regular 26 day cycle - plus that particular month I was using OPKs, so when I ovulated, I rang the nurse and changed the date of the blood test. She was fine with that.

As it happened, that was the cycle I conceived!

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artyjoe · 28/09/2004 15:18

I had six months of testing to be told that I didn't ovulate, didn't have a female hormone and would never have children...9 years later it seems I just didn't ovulate on the day the doctors tests were taken am now 24 weeks pregnant

You know your own body, definitely talk this through with your doctor. x

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Bibi20 · 29/09/2004 12:28

Thanks for your advice prettybird and artyjoe (what a nightmare for you artyjoe - thanks for sharing it, so glad it worked out for you finally).

I spoke to another Doctor this morning, and she's advised that the day '21' progesterone test should take place midway between ovulation and when af due. On average, this is 7 days before you're due on.

As my cycle is normally 32 days it will be a day 25 test for me.

(If I'm being picky my luteal phase is only 12 days therefore it should be day 26 but that's a Saturday so I won't worry!)

So it does in fact matter when you ovulate as the test is designed to determine if you've got enough progesterone to sustain early pregnancy, and testing too early in your cycle might well give an inaccurate result.

Very glad I asked (what would I do without Mumsnet?!) and slightly peeved that the first doctor ignored the fact that I'd told him I ovulate later on in my cycle. ho hum.

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