Tag Archives: opk as hpt

Off to the doctor today…

In a few hours I’m going to see my GP to confirm the pregnancy with her. I have to do this before they will refer me to the midwifery team. I am also really hoping, given what happened last month, my doctor will refer me to the EPU for an early scan to make sure that everything is going as it should and most importantly it’s all in the right place.

I’ve continued taking a test every day, but instead of bankrupting myself on HPTs I’ve kept on using the leftover OPKs from my stash.

I do have 2 digital test left but I’m holding on to them until at least the weekend as I desperately want to see 3+ on it. Will update later when I get back from the appointment.

UPDATE: yay! my GP has agreed to send me to the EPU for an early scan at about 7 weeks, just waiting for the call from her now with the date and time. So excited to think I’ll get to have a sneak peek at our little baby in about a fortnight’s time!

OPK as HPT Progression & Clear Blue Digital Tests

Thought I would post this for anyone who is interested. I haven’t had an over abundance of pregnancy tests in the house but I do have left over OPKs. I did one on Thursday night, Friday morning, Saturday morning and today (so 12 dpo to 15)

It’s nice to see them getting darker. Short and sweet post here but I find the whole OPK as HPT thing quite interesting!

UPDATE: I have to add this picture as well as it made me do a little happy dance

I don’t know if this is true but I did read somewhere that the conception indicator works like this

1-2 weeks – hcg level of 50-200 (96.5% accurate – the accuracy rating comes from Clear Blue’s own literature so I know that bit at least is true)

2-3 weeks – hcg level of 200-2000 (76.1% accurate)

3+ weeks – hcg level of 2000+ (96.9% accurate)

It’s also worth nothing that above 3 weeks the accuracy level can drop a lot (don’t have a specific figure about that). This is because of the Hook Effect. Basically the hcg levels can be so high that they overwhelm the test and it gives weird results. Some people testing with a regular HPT may find that they get a very faint line, or even a negative, but if they use a more dilute sample they will get a strong line again.

And to round this bit on CB Digis off here is a picture of the strips from the test after I broke it open (which you’re really not supposed to do).

The top is a low sensitivity strip and the bottom is a high sensitivity strip. I have broken a few digitals open in my time and while they might not always have lines this dark they have absolutely ALWAYS had 2 lines on the top strip and one on the bottom (kind of wish I had taken pictures before). So…. cracking open a digital is not a reliable way to determine whether or not you actually have a BFP and the digi processor just isn’t picking it up. http://www.peeonastick.com has a great section on this.

I cheated a little

If you are a hardcore ttc-er you are without doubt familiar with the website http://www.peeonastick.com

It’s a veritable mine of useful information regarding all things pregnancy test related. with tables of test sensitivity by brand, explanations of why you can’t reuse a test, why digital tests all have 2 lines (if you break them open), why you shouldn’t break tests open, the dangers of allowing your OPK and HPT to touch and, of course, using an OPK as a HPT.

See it turns out that the only thing differentiating lutinising hormone and human chorionic gonadotrophin is a beta subunit (basically a secondary protein structure) found on the end of the hcg molecule. It’s this subunit that a HPT is specific for (and why a pregnancy blood test is referred to as a “beta” or “beta hcg” count). An OPK doesn’t differentiate between the two so it will detect either LH or HCG, so theoretically you can use it as a pregnancy test. It’s worth noting though that OPKs are not as sensitive as HPTs so you’d likely get a positive on a HPT before you would on an OPK AND there is no way to know which hormone it is being detected.

Bearing all that in mind….

I may have pee’d on some OPKs. Technically that’s not breaking my promise not to take a pregnancy test before Sunday. Ooooo I wonder what this means?