(Closed) Night Shift and OPK’s

posted 6 years ago in TTC
Post # 4
Member
2000 posts
Buzzing bee
  • Wedding: July 2009

@Kalamaz17:  I wish I knew! Maybe you could ask your ob/gyn?

Post # 5
Member
110 posts
Blushing bee
  • Wedding: May 2010

They say afternoon because the morning urine is so concentrated from being held for so long. I would say to use your second urine of the day to avoid a false positive.

 

Good luck!!!

Post # 6
Member
403 posts
Helper bee
  • Wedding: September 2010

I wouldn’t think overconcentrated urine would be a problem.  They don’t recommend first morning urine for OPKs because the body usually metabolizes LH in the late morning early afternoon.  Since sleep schedule will be so different I would probably test when I woke up and then test about 12 hours later also.  Try to hold your urine for 3-4 hours before testing during your work shift if possible.  Testing more times throughout the day will give you a better chance of detecting your surge and can’t hurt. 

 

Post # 8
Member
1820 posts
Buzzing bee
  • Wedding: August 2010

There is some conflicting information and some misinformation above, so here’s the deal with OPKs:

Your LH surge starts in the morning, which means that the hormone will show up in your U by the late afternoon.  The testing recommendation is to test in the afternoon/evening so that you catch your surge on the first day – i.e., have as much notice of O as possible.  (You should get a + OPK 12-136 hours before O).  Once you get a +, you can stop testing.

Many women – especially those that drink a lot of water – have a hard time getting + results in the afternoon because hormone levels are diluted.  For this reason, some of us *do* test with FMU (in the morning).  A couple of things to be aware of – if you get a + OPK in the morning, your surge actually started the day before, so you will O 12-24 hours after a + result.  Second, if you generally have an easy time getting + results, using FMU may cause you to have a lot of near-positive results that could be confusing.

If you are testing in the afternoon, you will have no problems whatsoever – you will catch your surge on the first day *and* have the benefit of having concentrated U for a more accurate test.  (I am actually a little jealous…)

Post # 9
Bee
6473 posts
Bee Keeper
  • Wedding: June 2011 - Sydney, Australia

I would always test first thing AND in the afternoon – just in case. Maybe try both, if you can manage it?

Post # 11
Bee
6473 posts
Bee Keeper
  • Wedding: June 2011 - Sydney, Australia

@Kalamaz17:  Good point! I mainly use dip sticks but if I *think* I’m close to O or if I can see a super faint line, then I use the Clearblue Digital ones to confirm. It saves $$!!!

Post # 12
Member
110 posts
Blushing bee
  • Wedding: May 2010

Sorry for having my info wrong, ladies! Thanks for the correction!

Post # 14
Member
3773 posts
Honey bee
  • Wedding: December 1999

@Kalamaz17:  That is exactly what I do, use cheapies and then verify with the nice ones. I work nights all the time (7p-7a) and it is tricky to figure out when to do these things, and I definately can not temp because of it.  I do also think that the stress of working a few nights in a row can delay ovulation too, so just something to keep in mind.

Post # 15
Bee
6473 posts
Bee Keeper
  • Wedding: June 2011 - Sydney, Australia

@Kalamaz17:  Up to what works for you! I don’t mind going through the cheapies, so honestly, use those morning & night until you see a faint line – and then start using your Clearblue ones. The smily face is a nice reassurance!

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