Frequently Asked Questions

What does Ovulation Double Check measure?

Ovulation Double Check® measures a urine metabolite of the hormone progesterone.

When is progesterone produced?

Progesterone is very low in the beginning of the menstrual cycle. Once ovulation takes place, the ovaries produce progesterone in significantly higher amounts.

When should I use Ovulation Double Check?

Ovulation Double Check® should be taken AFTER you believe ovulation has taken place.

How are Ovulation Double Check tests different than other Ovulation Predictor Kits (OPKs)?

Ovulation predictor kits measure a hormone called luteinizing hormone (LH), which is released 24-48 hours before ovulation occurs. Ovulation Double Check® tests measure a metabolite of progesterone, which is produced after you ovulate. Therefore ovulation predictor kits (OPKs) are used before ovulation and Ovulation Double Check® tests are used after ovulation.

How are the tests packaged and when do they expire?

Each test is individually packaged in a foil pouch and sold in sets of 7. Each test will have a shelf life of >12 months from the date of manufacture.

Do Ovulation Double Check tests meet FDA requirements?

Yes, Ovulation Double Check® tests are FDA compliant. The tests are manufactured using cGMPS in a FDA inspected and ISO13485 certified facility. Each batch of tests meet all required specifications before being sent to consumers.

What countries can Ovulation Double Check tests be shipped?

We can ship Ovulation Double Check® tests anywhere within the United States, Canada, and Australia. We are working on being able to ship them worldwide. Please contact us if you would like to be a distributor of our product in your country:

Is Ovulation Double Check quantitative?

No. Ovulation Double Check® is designed to give either a + or – result and therefore are not quantitative. However, we are working on another version of this test that will give a quantitative measure of progesterone. We anticipate that the quantitative progesterone tests may be available in 2018.

Why is a single line a positive result and two lines are a negative result?

The way LH and HCG pregnancy tests work are by sandwiching the hormone between two antibodies. Since the metabolite of progesterone is so small, that technique won’t work for this test. We therefore use a competitive method. Similar methods are used to measure estrogen and do urine based drug testing.

How many tests do I need per month?

There are several factors that affect the number of tests you will need per month. These factors include cycle length, use of ovulation predictor tests (OPKs), BBT charting, cervical mucus (CM) tracking, etc. However, the average user will need 1-5 tests per month. Only a single positive test is needed confirm the presence of elevated progesterone metabolites in the urine.

Where are the tests sold?

Ours tests can only be purchased via our website or

1630A 30th Street PMB 143

Boulder, CO 80301