Mira is a at-home hormone monitor that measures the actual concentration of fertility hormones in your urine, then sends the results to an app on your phone. Unlike standard ovulation test strips that show you a simple positive or negative result, Mira gives you a numerical reading for each hormone, letting you track how your levels rise and fall across your cycle.
What Mira Measures
The system revolves around single-use test wands that you dip in a urine sample and insert into a small handheld analyzer. Different wand types measure different hormone combinations. The most comprehensive option, the Max wand, tracks three hormones at once: estrogen (specifically its urine metabolite, E3G), luteinizing hormone (LH), and progesterone (its urine metabolite, PdG). A fourth hormone, FSH (follicle-stimulating hormone), is available through a separate wand called Ovum.
Each of these hormones tells you something different about where you are in your cycle:
- E3G (estrogen metabolite) rises in the days leading up to ovulation. Tracking it helps identify the start of your fertile window, which can open five or six days before you actually ovulate.
- LH surges roughly 24 to 36 hours before the egg is released. This is the same hormone that standard ovulation strips detect, but Mira shows you the exact concentration rather than just a dark or faint line.
- PdG (progesterone metabolite) rises after ovulation. A sustained increase confirms that ovulation actually happened, not just that it was about to happen.
- FSH stimulates follicle growth in your ovaries. Higher FSH levels over time can signal that the ovaries have fewer follicles remaining, which is a normal part of aging and relevant for anyone wondering about ovarian reserve or approaching perimenopause.
By combining these hormones, Mira can both predict ovulation before it occurs and confirm it after the fact. Most basic ovulation kits only do one or the other.
How the Testing Process Works
The physical steps are straightforward. You collect a urine sample in a cup, dip the white end of a test wand into it for exactly 10 seconds, then insert the wand into the slot on the Mira analyzer. You leave the device on a flat surface for about 15 minutes while it processes. Once it finishes, results are sent to the Mira app automatically via Bluetooth.
Most users test with their first morning urine because hormone concentrations are highest after an overnight hold. The app tells you which days to test based on your cycle history, so you’re not burning through wands every single day. Early in the cycle, testing might be every other day. As you approach your expected fertile window, daily testing picks up the critical LH surge and estrogen rise.
Numerical Results vs. Standard Test Strips
This is the core difference between Mira and a box of ovulation strips from the drugstore. A conventional strip uses a lateral flow test, the same basic technology as a home pregnancy test. You compare line darkness to a control line and decide whether the result is “positive.” That judgment call is subjective, and it only tells you whether a hormone is above or below a fixed threshold.
Mira’s analyzer reads the test wand and returns a specific number for each hormone. Rather than seeing “high” or “low,” you see your actual hormone concentration in real time. The app then plots these numbers on a curve across your cycle, so you can visually track the estrogen climb, the LH spike, and the progesterone plateau that follows ovulation.
This matters because hormone patterns vary significantly from person to person. Some women have LH surges that are short and sharp; others have a slower, more gradual rise. A binary positive/negative strip can miss a surge that doesn’t cross its preset threshold, or it can show a “positive” that doesn’t actually represent your peak. Seeing exact numbers lets you identify your personal baseline and recognize your own surge pattern over time.
How the App Interprets Your Data
The Mira app takes your numerical hormone readings and uses an algorithm to calculate a daily fertility score. This score reflects your likelihood of conception on any given day based on the interplay of your tracked hormones. As estrogen rises, the app flags the opening of your fertile window. When it detects the LH surge, it pinpoints your most fertile days. After ovulation, a rise in PdG confirms the window has closed.
Over multiple cycles, the algorithm learns your personal patterns. Your fertile window prediction becomes more tailored to your body rather than relying on textbook averages. The app also stores your full hormone history, which can be useful if you want to share detailed cycle data with a fertility specialist.
Why Quantitative Tracking Helps With Irregular Cycles
For people with regular 28-day cycles, a basic ovulation strip often works fine. Where Mira offers a real advantage is for those with irregular cycles, including people with conditions like PCOS. Irregular cycles make it nearly impossible to predict when ovulation will happen using calendar methods, and standard strips can produce confusing results. PCOS in particular can cause multiple LH surges that never lead to actual ovulation, leaving you guessing about which surge, if any, was the real one.
Because Mira tracks the numerical hormone values across the full cycle, you can distinguish between a false alarm and a true ovulatory surge. The addition of PdG (progesterone) confirmation is especially valuable here. If you see an LH spike but PdG never rises afterward, ovulation likely didn’t occur that cycle. That kind of clarity is difficult to get from any other at-home tool.
FSH Tracking and Perimenopause
The Ovum wand adds FSH tracking, which serves a different purpose than fertility timing. FSH is the hormone your brain sends to your ovaries to stimulate follicle growth each cycle. As the number of remaining follicles declines with age, FSH levels tend to rise because the brain has to “shout louder” to get a response.
Tracking FSH over time can help you understand where you are on the reproductive aging timeline. Consistently elevated FSH may suggest diminishing ovarian reserve, which is completely normal but useful to know if you’re considering your fertility options. For people experiencing symptoms like irregular periods, hot flashes, or vaginal dryness, FSH data can also add context to conversations with a doctor about whether perimenopause has begun. Mira provides numerical FSH results rather than a simple high/low reading, so you can track the trend across months rather than relying on a single snapshot.
What You Need to Get Started
The system has two components: the Mira analyzer (the physical device) and the test wands, which are sold separately in packs. The analyzer is a one-time purchase that pairs with your phone. Wands are an ongoing cost, and the type you buy depends on what you want to track. Max wands cover LH, E3G, and PdG together. Ovum wands add FSH. There are also simpler, less expensive wands that track only LH and E3G if that’s all you need.
A typical cycle requires somewhere between 10 and 20 wands depending on cycle length and how many days the app recommends testing. That recurring cost is the main practical consideration, since the wands are not reusable. For people actively trying to conceive or monitoring a specific hormonal concern, the granularity of the data can justify the expense. For casual cycle tracking, simpler and cheaper tools may be sufficient.