Short answer: partly. A urine PdG strip can show that a progesterone breakdown product has climbed above a set threshold, which is indirect evidence that you ovulated. A serum progesterone test, ordered by a clinician, gives a single number from one blood draw at one point in your cycle. Neither one actually sees an egg being released. Only ultrasound does that. Both are reasonable ways to answer the question “did I probably ovulate this cycle?”
Which one makes sense depends on why you’re asking. A one-off reassurance check is a different job from documenting a pattern before a fertility appointment, and that’s different again from monitoring a medicated cycle.
Why confirm ovulation at all?
A positive ovulation predictor kit (OPK) tells you luteinizing hormone (LH) is surging. It doesn’t tell you the follicle released an egg afterwards. Most of the time it does, but not always. That gap is behind charts like a BBT rise without a positive OPK, or a positive OPK with no temperature shift after it.
After ovulation, the empty follicle becomes the corpus luteum and starts making progesterone. That progesterone is what raises your basal body temperature and what both PdG strips and the blood test pick up. If you want the bigger picture of that hormone, our guide to progesterone after ovulation covers what it does in the luteal phase.
Confirming ovulation is most useful when:
- your cycles are irregular or long and you’re not sure you ovulate every month (see signs you may not be ovulating)
- you get positive OPKs but your temperature chart never shows a clear shift
- you have PMOS (formerly PCOS) and see several LH surges in one cycle
- you want something concrete to bring to a first fertility appointment
If your cycles are regular and your BBT chart shows a clean, sustained rise every month, adding PdG strips usually tells you something you already know.
What a PdG strip actually measures
PdG stands for pregnanediol glucuronide. According to the FDA’s 510(k) decision summary for the Proov Test, PdG is “the major urine metabolite of progesterone,” and that test is cleared over the counter “as an aid for confirmation of ovulation” (FDA K191462). The details in that summary show how these strips work:
- It’s qualitative. It’s a lateral flow strip that reads positive or negative against a cutoff, not a number. In the cleared Proov assay, the cutoff is 5 µg/mL of PdG.
- It uses first-morning urine collected during the non-menstruating part of your cycle.
- Results near the line can disagree. The method comparison reported some discordant results with samples between roughly 4.4 and 5.2 µg/mL. If your level sits near the cutoff, two strips on the same day may not match.
- It’s regulated as a Class I progesterone test system. That’s the lowest-risk device category, and it isn’t the same as being validated to diagnose a luteal phase problem.
Other brands sell PdG strips, and some quantitative monitors measure PdG alongside LH and estrogen. We compare two of them in Oova vs Mira. Each brand sets its own threshold and testing schedule, so follow your product’s instructions rather than another brand’s.
What a progesterone blood test measures
A serum progesterone test measures the hormone directly in your blood at the moment of the draw. ASRM’s patient fact sheet on ovulation detection says elevated progesterone is usually associated with ovulation and that the test is typically done about one week before your expected period (ASRM).
On interpretation, a 2023 American Family Physician review notes that midluteal progesterone levels below 3 ng/mL indicate anovulation (AAFP). An older study summarized in the same journal compared ovulation tests against ultrasound in infertile women. A single midluteal progesterone measurement, with a 6.0 ng/mL cutoff, confirmed ovulation with an accuracy of 0.79 (AAFP summary of Guermandi et al.). Different studies and labs use different cutoffs, so ask your clinician which one they use.
Timing matters more than the calendar date. The classic “day 21 progesterone” assumes you ovulate around day 14. If you ovulate on day 20, a day-21 draw comes far too early and can look falsely low. ConceiveGuide explains this in why day 21 progesterone is often mistimed.
PdG strips vs blood test: side by side
| Urine PdG strip | Serum progesterone test | |
|---|---|---|
| What it detects | PdG (a progesterone metabolite) in urine, above a fixed cutoff | Progesterone in blood, reported as a number |
| Sample | First-morning urine, at home | Blood draw at a lab or clinic |
| How often | Several mornings in a row after a suspected ovulation, per the brand’s instructions | Usually once, timed to about a week after ovulation |
| Result | Positive or negative (or a reading from an app or monitor) | A level your clinician interprets against their cutoff |
| Who arranges it | You, over the counter | A clinician orders it |
| Cost framing | You pay per strip, and a cycle can use several | One draw, but it may involve a visit, a lab fee and insurance billing |
| What it can’t tell you | Whether the level is “enough” for pregnancy, or why it’s low | What happened on the other days of your luteal phase |
Neither test is better across the board. The strip gives you a few days of data in a row at home. The blood test gives a measured value that your clinician can act on, and it counts as part of a formal workup.
There’s no honest single price comparison, because it depends on the brand, the pack size, how many strips you use per cycle, and whether your insurance covers lab work. Compare per-test cost against per-draw cost: count how many strips you’d realistically use in a cycle, then ask your clinic or insurer what a progesterone draw costs you.
How to use PdG strips without over-reading them
A sensible routine
A positive PdG strip doesn’t mean you’re pregnant, and a negative one doesn’t mean you can’t be. It only tells you the metabolite was above or below that brand’s threshold on that morning. If you’re taking prescribed progesterone, ask your clinic whether a urine PdG reading means anything for you before you rely on it.
When a low or negative result is worth acting on
A single cycle without confirmation is common and not a diagnosis. Patterns matter more. ASRM’s fact sheet notes that if ovulation isn’t detected for two or more consecutive cycles, an ovulatory problem may be present (ASRM). That’s a good point to book an appointment rather than buy more strips.
“Short” or “weak” luteal phases are an area where home testing runs out of road. Whether a luteal phase problem is a meaningful diagnosis, and how it’s treated, is clinical territory. ConceiveGuide’s luteal phase defect explainer covers what’s known.
When to see a doctor: ASRM and ACOG recommend an infertility evaluation after 12 months of trying if you’re under 35, after 6 months if you’re 35 to 40, and right away if you’re over 40 or have a known risk factor such as very irregular cycles (AAFP, citing ASRM and ACOG). Our hub on when to see a fertility doctor walks through what to bring.
Where PdG fits among your tracking tools
Think of tracking in three layers:
- Prediction: OPKs and cervical mucus tell you ovulation is coming, so you can time sex.
- Confirmation: a BBT shift, PdG strips or a serum progesterone test tell you it probably happened.
- Diagnosis: ultrasound and clinic bloodwork explain why it isn’t happening, if it isn’t.
Most people trying to conceive only need the first layer plus a cheap thermometer for the second. If you’re weighing a thermometer against a wearable sensor for that confirmation layer, LifeFertile compares them in BBT thermometer vs wearable fertility sensor. PdG strips are a useful add-on when temperatures are hard to read, such as with shift work, broken sleep or travel, or when you want a few cycles of extra evidence before an appointment. Our ovulation tracking hub lays out all the methods.
PdG ovulation confirmation test strips
If your BBT chart is hard to read, a pack of PdG strips can add a few mornings of confirmation data. Check which testing window the brand recommends before you buy.
Check price on Amazon →Not sure your OPK and BBT agree?
Read our troubleshooting guide for cycles where your temperature rises but your ovulation tests never turned positive.
BBT Rise, No Positive OPK →Frequently Asked Questions
Can a PdG strip tell me if my progesterone is high enough to get pregnant?
No. A PdG strip is qualitative, so it only shows whether the metabolite is above the brand's cutoff. Whether your progesterone is adequate is a clinical question that a clinician answers with bloodwork and your history.
When should a progesterone blood test be done?
About a week after ovulation, which ASRM describes as roughly one week before your expected period. Timing it to your own ovulation rather than to cycle day 21 matters if your cycles are longer or shorter than 28 days.
Are PdG strips FDA cleared?
At least one is. The FDA's 510(k) decision summary K191462 covers the Proov Test as an over-the-counter aid for confirmation of ovulation. Check the specific brand you're buying, since not every product on the market has the same clearance.
Do I need PdG strips if my BBT chart shows a clear shift?
Usually not. A sustained temperature rise already tells you progesterone went up. PdG strips add the most value when temperatures are noisy or don't line up with your ovulation tests.
Can PdG strips confirm pregnancy?
No. They don't detect hCG. Use a home pregnancy test at the right time, or ask your clinician for a blood hCG test.
Primary sources and further reading
- FDA — 510(k) decision summary K191462, Proov Test (PdG) (2019)
- ASRM (ReproductiveFacts.org) — Ovulation Detection patient fact sheet (revised 2023)
- American Family Physician — Infertility: Evaluation and Management (2023)
- American Family Physician — Tips from Other Journals: reliability of ovulation tests in infertile women (2001, summarizing Guermandi et al.)
Sources checked October 12, 2026.
When It’s Time for the Next Step
If you’ve been trying for 12+ months (or 6 months over 35), it may be time to see a fertility specialist. If cost is a barrier, you can also compare clinics abroad and get a written quote before you decide.
See Your Options Abroad → This link connects you with international fertility treatment resources. We may receive referral compensation at no cost to you.