Oova Review – Real Hormone Numbers, and Why Weight Loss Changes Your Cycle

Oova is an at-home hormone tracking kit from $159 that measures actual concentrations of three hormones rather than giving you a line on a strip. It appears on a weight-loss site because significant weight loss can restart ovulation in women who were not ovulating — and a good many of them have no idea it has happened.

What Makes It Different From an Ovulation Strip

Two things follow from that, and both are genuine.

The first is PdG. LH predicts that ovulation is likely; a rise in PdG afterwards indicates it actually happened. Those are different questions, and standard strips only answer the first. Women can have an LH surge without releasing an egg, and a test that never checks the back half of the cycle will not tell them.

The second is that a number beats a threshold when your cycles are irregular. Threshold tests assume a typical cycle. If yours is long, short or unpredictable — which is the case for many women with PCOS, and for many women at higher body weight — a yes/no test either misses the window or reports false positives. A concentration curve does not have that problem.

The system was developed by Mount Sinai physicians and uses patented smartphone scanning to produce the readings. That is a better provenance than most consumer hormone products carry.

Why This Matters If You Are Losing Weight

Those two facts point in opposite directions and they land on the same person. Someone who spent years being told she was not ovulating, who reasonably stopped thinking about contraception, can start ovulating again several months into treatment — while taking a medication that must not be used in pregnancy.

It compounds with the absorption problem. Tirzepatide’s label instructs oral contraceptive users to switch to a non-oral method or add a barrier for four weeks after starting and after each dose increase, because delayed gastric emptying reduces absorption — covered in our Wisp review and our Natural Cycles review. Returning fertility and reduced contraceptive absorption at the same time is a combination worth knowing about.

Oova is useful in both directions here. If you are trying to conceive after weight loss, it tells you whether ovulation is happening and when. If you are not, it tells you that your assumptions about your own cycle may have expired. What it does not do is act as contraception — it is a measurement tool, and nothing on this page should be read as saying otherwise.

Pricing

Read the strip counts carefully, because they are the real cost. A Cycle Kit covers roughly one cycle. If you are tracking over months — which is the situation for most people whose cycles are irregular enough to want this — the recurring strip cost matters more than the entry price, and it is the number to establish before buying.

The 46% Claim

Oova is marketed as improving the chances of natural pregnancy by approximately 46%. We could not locate the underlying study, its design, its comparison group or its sample size, and we would treat that figure with caution until those are available.

The specific question a percentage like that has to answer is: compared to what? Compared to no tracking at all, better-timed intercourse plausibly improves conception rates. Compared to standard ovulation strips — the actual alternative most buyers are choosing between — the improvement would be a very different and much smaller number. Without the study you cannot tell which comparison is being made.

The mechanistic case for Oova does not depend on that figure, which is why we have not marked it down harder. Measuring PdG genuinely answers a question strips do not.

The Perimenopause Kit

Oova also sells a perimenopause hormone tracking kit, which is worth flagging for readers of our Winona review. Perimenopause is a period of erratic rather than simply declining hormones, and a single blood test on a single day is a poor way to characterise it.

We have not assessed that kit separately and cannot say how well its readings map onto clinical decision-making. Perimenopause is diagnosed on symptoms and history rather than on hormone levels, so treat any tracking here as context for a conversation rather than a substitute for one.

Pros and Cons

Who Should Use It

Oova suits you if your cycles are irregular, you have PCOS, standard strips have given you confusing results, or you want to know whether ovulation is actually occurring rather than merely being predicted. It suits you especially if substantial weight loss has changed cycles that used to be absent or unpredictable.

Skip it if your cycles are regular and you simply want to time intercourse — cheap strips do that adequately. And do not use it as contraception. If you are on a GLP-1 and need to avoid pregnancy, that is a prescribed-method question; our Wisp review covers a cheap route to sorting it out.

Limitations of This Review

Based on published product information and independent coverage checked on 7 August 2026. We could not establish per-strip refill pricing, subscription terms, refund policy, FDA regulatory status of the device, or the study behind the 46% figure. We have not tested the kit or verified its accuracy against laboratory assays — the description of what it measures comes from the manufacturer. Statements about weight loss and ovulation, and about GLP-1s in pregnancy, come from published research and prescribing information rather than from Oova. Nothing here is medical advice, and this device is not a contraceptive.

Frequently Asked Questions

Verdict

Measuring PdG to confirm ovulation happened, rather than only measuring LH to guess that it might, is a genuine difference and not a marketing distinction. For irregular cycles it is the difference between usable data and noise.

The reason it belongs on this site is narrower and more important than the product: if you have lost significant weight and were previously told you did not ovulate, that may no longer be true. Find out deliberately rather than by accident.