OPK Test Line Narrow or Wide
6 Replies
Cloe - June 10

Does anyone here use First Response OPK kits? I tried them this month, but I am not sure if I am reading them right. The directions say that for a positive LH surge the test line needs to be as dark or darker than the reference line. The problem is one of my results is as dark as the referance line but much skinnier than the referance line. Does anyone here know if a positive test line is also as wide of a band of a referance line? Any help would be appreciated.


slowpoke01 - June 10

i dont thnk that it matters if it is as wide as long as it is as dark i usually get a lighter line on day 12 and a dark line on day 13 and as long as it is as dark i havent really paind attention to how wide it is but i would say as long as it is as dark as the control line


Cloe - June 11

Thank you, I am going crazy right now because my doctor called me on Friday and told me I must not have ovulated because my progesterone came back low on day 21, but I had all the ovulatory symptoms and AF is late. If I were to go by symptoms and OPK I am now 19 dpo with no AF. I am trying hard to bear in mind that this cycle could be annovulatory. I have to go for bloodwork tomorow to retest that progesterone.


slowpoke01 - June 11

hope that it turns out good for you i would say that you ovulated but im not a dr and the tests will tell for sure so think positive and good luck toyou


Cloe - June 12

Thank you slowpoke. I had really bad menstrual type cramps about 8 days ago. Maybe I ovulated really late, but you can't ovulate on CD28 can you?


slowpoke01 - June 18

if you have a long cycle you probably could i have read where women have 40 day cycles and stuff like that so it is possible depends on how long your cycle was let me know


Tammy276 - June 18

It is possible to ovulate that late. I have a really long cycle, and I usually ovulate around day 27-30. I have a very long cycle. Normally 38 - 45 days. It really sucks. The question about the test sticks. The test line (not the reference line) should be more than 50 % dark when you are ovulating. My test sticks, the one line (the one that tells you if you are ovulating or not) was always partially dark. I finally called the company and spoke with someone and they told me that in order for it to be a positive OPK, at least 1/2 of the line needs to be as dark or darker than the reference line. Hope this helps.



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