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How to Read a Numeric Ovulation Test

Using a standard strip that reads by test and control lines instead? See the full ovulation test strip instructions.

TEST PROCEDURE

Dip the strip into the urine for 5 seconds

Dip strip

Lay the strip flat

Lay flat

Read results in 5 minutes

Positive (LH Surge): Two lines equal or darker → LH surge.

Positive result

Negative (No LH Surge): One line or test line lighter than control.

Negative result

MEASURING LH LEVELS

Measuring LH numerically provides better insight into your LH surge, peak, and ovulation window.

Compare the Test Line to the Color Chart. The numbers represent approximate LH levels.

Compare chart

Graph results on the Fertility Chart to track your LH curve month to month.

Graph LH

READING THE RESULTS

Low: Test line lighter than 25.

Low LH

High: Test line similar/darker than 25 → ovulation within 48h.

High LH

Peak: Test line darker than 40 → LH highest level.

Peak LH

Prefer a device that shows a smiley or a digital readout? See the digital ovulation test instructions.

WHEN TO BEGIN TESTING?

Determine your cycle length. If unknown, begin 11 days after first period. Use chart below.

Cycle chart

Example: 26-day cycle → start on day 10.

Using midstream tests this cycle? See the ovulation midstream test instructions.

FREQUENTLY ASKED QUESTIONS

Using and timing

How do ovulation test strips with numeric results work? +
These strips work the same way as standard ovulation tests but add a visual LH scale. By comparing your test line to the numbered color chart, you can see an approximate LH level: Low, High, or Peak. This makes it easier to track your LH rise day by day and see when your surge begins.
What is the difference between numeric and standard ovulation tests? +
Standard strips show positive or negative. Numeric strips add a color chart with LH values so you can see whether your level is Low (below 25), High (around 25), or Peak (above 40). This is especially useful if your surge is subtle or if you want to see it building over several days before it peaks.
When should I start testing, and at what time of day? +
Your cycle length determines when to start. Use the chart included in your kit, or begin on day 11 if you’re unsure. Test between late morning and evening for the most reliable results, and reduce fluids for about two hours before. Test at the same time daily so your numeric readings are comparable day to day.

Understanding your results

What LH number means ovulation is coming? +
A reading at or above 25 (High) means your surge is underway and ovulation is likely within 48 hours. A reading above 40 (Peak) means LH is at its highest. Ovulation is likely within 24 hours. The best time to try to conceive is from the day your LH reaches High through the following 1–2 days.
My LH numbers are always high. What does that mean? +
Some people have higher baseline LH, especially with conditions like PCOS. With standard strips, this can make every test look positive. Numeric results help here because you can see whether your LH is truly spiking above your personal baseline or staying flat at an elevated level. If your numbers stay high throughout the cycle without a clear peak, talk to your doctor.
I always see a faint line. Is that normal? +
Yes. LH is present at low levels throughout your cycle. On the numeric scale, a faint line typically means your LH is below 25, which is your baseline. You’re looking for the shift in readings from Low to High to Peak. That’s your surge.
Can I scan numeric results in the Pregmate app? +
Yes. Scan each strip in the app to save your result with the date and cycle day. The app tracks your LH curve over time, so you can see how your surge builds and compare patterns across cycles.

Medical factors and special cases

Can medications or health conditions affect my numeric readings? +
Yes. Fertility medications containing LH or hCG can push your readings up and keep them elevated, so a High or Peak result may not reflect a natural surge. Conditions such as PCOS, menopause, or recent pregnancy can raise your baseline, meaning your Low may sit closer to 25 than it does for most people. Everyday medications like antibiotics or pain relievers do not affect the color scale. If you are on fertility treatment, ask your doctor how to interpret your numbers.
Do birth control pills affect numeric ovulation tests? +
Yes. After you stop oral contraceptives, your cycle needs time to settle, and your LH readings during those first cycles may not follow a normal Low to High to Peak pattern. Wait until you have had at least two regular cycles before you rely on your numbers. Testing earlier still works for building a picture of your baseline, but treat those readings as a reference point rather than a prediction.
Does a Peak reading confirm that I ovulated? +
No. A Peak reading means your LH reached its highest level, which usually leads to ovulation within about 24 hours, but the test measures the hormone, not the release of the egg. Confirming that ovulation actually happened requires ultrasound or basal body temperature tracking. What your numbers do tell you is when your fertile window opens, which is what matters for timing.

Important reminder

These FAQs and the information on this page are for educational purposes only and should not be used as medical advice. If you experience unusual symptoms or are unsure about your results, consult a healthcare provider.

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Medically reviewed by Inna Galitsky, MD, PhD. Reviewed: Aug 10, 2026.

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