Gynecology · Fertility & cycle health
Ovulation Testing in Gangnam: Confirm When and Whether You Ovulate
Ovulation testing shows whether your ovaries are releasing an egg and when, using home LH urine kits, follicle-tracking ultrasound and a mid-luteal progesterone blood test. At Hommage Clinic in Gangnam, Seoul, OB/GYN specialist Dr. Park Yuna tracks your follicle by ultrasound, confirms ovulation with blood tests and explains your fertile window, or what to do if you are not ovulating.
Quick answer
Ovulation testing shows whether and when you release an egg. At Hommage Women's Clinic in Gangnam, Seoul, female OB/GYN specialist Dr. Park Yuna combines follicle-tracking ultrasound, usually two to four short scans from about cycle day 8–12, with a progesterone blood test about 7 days after ovulation. Home LH kits help time sex but cannot prove that ovulation happened; ultrasound and progesterone can.
Key takeaways
- Your fertile window is about six days, ending on the day of ovulation.
- Ovulation usually follows the start of the LH surge by about 24–36 hours.
- LH kits are less reliable with PCOS, irregular cycles or recent hormonal contraception.
- If tests show you are not ovulating, the cause is usually found and treatable.
Infographic
Ovulation testing in numbers
Fertile window
Ending on ovulation day (221 women, NEJM 1995).
LH surge to ovulation
Your most fertile days are the positive test day and the next one to two.
Ultrasound scans
In one cycle, every 1–3 days from about day 8–12.
Mature follicle
Typical size when ovulation is near; growth is often 1–2 mm a day.
Progesterone test
After ovulation, or 7 days before your next period.
When to get checked
Trying for 12 months, or 6 months if you are 35 or older.
Ovulation testing at a glance
| Key fact | Details |
|---|---|
| What it is | Tests that show whether and when an egg is released in your cycle |
| Methods | Home LH kits, follicle-tracking ultrasound, mid-luteal progesterone blood test |
| Ultrasound timing | Usually from about cycle day 8–12, repeated every 1–3 days until ovulation |
| Blood test timing | Progesterone about 7 days after ovulation, or 7 days before your next period |
| Comfort | Scans take a few minutes and feel like a routine internal exam; no radiation |
| Reviewed by | Dr. Park Yuna, OB/GYN specialist |
Ovulation testing can help if you
- Are trying to conceive and want to time sex around your fertile window
- Have irregular, long or unpredictable cycles
- Have PCOS, thyroid problems or high prolactin and want to know if you ovulate
- Have been trying for 12 months, or 6 months if you are 35 or older
- Are taking ovulation medication such as letrozole and need monitoring
Seek urgent care instead if you have
- A positive pregnancy test with one-sided pelvic pain, shoulder-tip pain or bleeding
- Sudden, severe pelvic pain, especially with fever, vomiting or fainting
- Rapid abdominal swelling or shortness of breath while taking fertility medication
What is ovulation testing?
Ovulation testing confirms whether an egg is released in your cycle and pinpoints when it happens. Knowing this helps you time sex for pregnancy and helps your doctor find the reason if pregnancy is taking longer than expected.
In a typical cycle, rising follicle-stimulating hormone (FSH) makes one follicle in the ovary grow. A surge of luteinizing hormone (LH) then triggers the follicle to release its egg, usually about 24–36 hours after the surge begins. The empty follicle becomes the corpus luteum, which produces progesterone to prepare the lining of the uterus. Each ovulation test looks at one part of this chain: the LH surge, the growing follicle, or the progesterone that follows.
Which ovulation tests are available?
There are three main ways to check ovulation, and each answers a slightly different question:
- Home LH urine kits detect the LH surge that comes just before ovulation. They are inexpensive, sold at pharmacies and useful for timing sex. Start testing a few days before you expect to ovulate, and follow the kit's instructions on the time of day.
- Follicle-tracking ultrasound (folliculometry) uses a series of transvaginal scans to measure the growing follicle and the lining of the uterus, then shows that the follicle has collapsed after ovulation. It is the most direct way to see ovulation happen. Read more about pelvic ultrasound .
- Mid-luteal progesterone blood test is taken about 7 days after ovulation. A clearly raised level confirms that you ovulated in that cycle. It is part of standard hormone testing .
Basal body temperature charts and cervical mucus changes can also show patterns, but they only confirm ovulation after the fact and are easily affected by sleep, illness or alcohol.
How does follicle tracking work?
Follicle tracking usually needs two to four short visits in one cycle. The first scan is typically around day 8–12, counting the first day of your period as day 1, and later if your cycles are long.
- First scan: Dr. Park measures the follicles in each ovary and the thickness of the uterine lining.
- Follow-up scans: every 1–3 days, the leading follicle is measured as it grows, often by about 1–2 mm a day. Ovulation typically happens when it reaches around 18–25 mm.
- Confirmation: a scan after ovulation shows the follicle has collapsed or a corpus luteum has formed, and a progesterone blood test can be added.
Each scan takes a few minutes. A transvaginal scan gives the clearest view of the follicles; if you are not sexually active, a transabdominal scan can be used, although it shows less detail.
How accurate are home ovulation kits?
LH kits are good at detecting the surge in women with regular cycles, but a positive test does not prove that an egg was released. The surge can happen without the follicle rupturing, and the kit cannot show that.
Kits are less reliable if you have PCOS , because LH can be high for much of the cycle and give repeated positives. Very long or irregular periods , recent use of hormonal contraception, perimenopause and some fertility medicines can also confuse results. If your kits never turn positive, keep turning positive, or you have been trying without success, ultrasound tracking and a progesterone test give a clearer answer.
What if you are not ovulating?
Not ovulating regularly, called anovulation, is one of the most common and most treatable causes of difficulty getting pregnant. The next step is to find the reason.
Common causes include PCOS, thyroid disorders, high prolactin, significant weight change, intense exercise or stress, and reduced ovarian reserve. Blood tests, including an AMH test , and an ultrasound usually point to the cause. Depending on the result, treatment may involve correcting a thyroid or prolactin problem, lifestyle support, or ovulation medication such as letrozole, with ultrasound monitoring to check how many follicles grow. If IUI, IVF or other assisted reproduction is needed, a referral to a fertility center is arranged.
Risks and side effects of ovulation testing
Ovulation testing itself is low risk. Transvaginal ultrasound uses sound waves, not radiation, and may cause brief pressure or mild discomfort; you can ask to pause at any time. A blood test can leave a small bruise or make you feel lightheaded.
If ovulation medication is used, monitoring matters more. Medication can make more than one follicle grow, which raises the chance of twins or triplets, and rarely causes ovarian hyperstimulation syndrome. Mild bloating or one-sided twinges around ovulation are common. Call the clinic, or seek urgent care, if you have severe pelvic pain, rapid abdominal swelling, vomiting or shortness of breath, or if you have a positive pregnancy test with pain or bleeding.
Ovulation testing at Hommage Clinic
Hommage Clinic is a women's clinic in Gangnam, a short walk from Sinnonhyeon Station. Follicle scans are performed and read by Dr. Park Yuna, a female OB/GYN specialist, and blood tests can be taken at the same visit. Walk-ins are welcome, but scan visits are best booked ahead around your cycle dates. You can also explore our othergynecology services.
If you are enrolled in Korea's National Health Insurance, ultrasound and blood tests done for a medical reason, such as irregular cycles or infertility, are often covered, while some planning tests are not. Visitors without coverage pay the clinic's fees directly, and you receive a written quote before testing begins.
Timing
Your fertile window: when is the best time to conceive?
An egg survives for about a day after it is released, but sperm can survive in the reproductive tract for several days. That is why the fertile window starts before ovulation. In a landmark study of 221 healthy women planning pregnancy, published in the New England Journal of Medicine in 1995, every conception came from sex during a six-day window ending on the day of ovulation. The chance of conception was about 10% for sex five days before ovulation and rose to about 33% on the day of ovulation itself.
In practice, this means that having sex every one to two days in the days leading up to ovulation gives the best chance, and waiting for a positive test before starting can mean missing some of the most fertile days. Ovulation testing helps you find where your window falls, especially if your cycles are not a textbook 28 days.
Folliculometry
Follicle tracking ultrasound: a scan-by-scan schedule
Follicle tracking, also called folliculometry or ovulation scanning, is the most direct way to see ovulation. Dr. Park measures the leading follicle and the lining of the uterus at each visit, so you can see the follicle grow, know when your most fertile days are, and later confirm that it has released its egg. The schedule below is for a typical 28-day cycle; with longer cycles the first scan is simply moved later.
Each scan also checks the endometrium, the lining that an embryo implants into, and looks for anything that might matter for fertility, such as an ovarian cyst or a fibroid. If you are on ovulation medication, scans show how many follicles are growing, which matters because more than one mature follicle raises the chance of twins.
Hommage · Gangnam
Hommage Women's Clinic · Gangnam, Seoul
Each follicle scan takes only a few minutes. Illustrative photo.
Comparing methods
Ovulation test kit vs ultrasound vs progesterone blood test
Each method looks at a different moment in the cycle. An LH kit predicts that ovulation is coming. A follicle scan watches it happen. A progesterone blood test confirms afterwards that it did. Many women start with kits at home and add ultrasound and blood tests when kits give confusing results or pregnancy is taking longer than expected. UK guidance from NICE suggests a mid-luteal progesterone test to confirm ovulation, while noting that the lowest level considered to indicate ovulation varies between laboratories.
| Compare | Home LH kit | Follicle ultrasound | Progesterone test |
|---|---|---|---|
| Answers | Is ovulation likely in the next 1–2 days? | Is a follicle maturing, and has it released its egg? | Did I ovulate this cycle? |
| Where | At home | At the clinic, 2–4 visits | At the clinic, one blood draw |
| Best for | Timing sex in regular cycles | Irregular cycles, PCOS, medication monitoring | Confirming ovulation in a fertility work-up |
| Main limit | A surge does not prove ovulation; false positives with PCOS | Needs several visits at the right time | Only useful if timed about 7 days after ovulation |
Hommage · Gangnam
Hommage Women's Clinic · Gangnam, Seoul
Home LH kits are a useful first step for timing sex. Illustrative photo.
At home
How to use ovulation test kits correctly
Most problems with LH kits come from testing at the wrong time or reading them in the wrong situation. These tips make home testing more useful, and help you know when it is time for a scan instead.
Do
- Start a few days before you expect to ovulate (cycle length minus about 17)
- Test at the time of day your kit recommends, at a similar time each day
- Have sex on the positive day and the next one to two days
- Keep a note of positives and period dates to bring to your visit
- Book a scan if kits never turn positive over several cycles
Don't
- Wait for a positive before having any sex; the days before count too
- Rely on kits alone if you have PCOS or very irregular cycles
- Assume a positive means you definitely ovulated
- Read results while on hormonal contraception or just after stopping
- Keep testing for many months without a check-up
Your situation
Ovulation testing with PCOS, irregular periods or after the pill
If your cycles are regular, ovulation testing is mainly about timing. If they are irregular, it becomes a diagnostic test: the key question is whether you ovulate at all, and how often.
PCOS
In polycystic ovary syndrome, LH can stay high for much of the cycle, so kits may show repeated positives, or a faint line that never clearly peaks. Many small follicles may be visible on ultrasound without one becoming dominant. Follicle tracking shows whether a leading follicle develops, and a progesterone test confirms whether ovulation followed. Read more aboutPCOS treatment.
Long or unpredictable cycles
With cycles longer than about 35 days, or that vary a lot, scans start later and may need to be repeated. A blood test for thyroid function, prolactin and anAMH testcan help explain why. See alsoirregular periods.
After stopping birth control
Hormonal contraception stops ovulation while you use it. After stopping, many women ovulate again within a few cycles, but the first cycles can be irregular, and kits may be harder to read. If periods have not returned after a few months, an assessment is worthwhile. Ourbirth controlpage explains how each method affects your return to fertility.
Hommage · Gangnam
Hommage Women's Clinic · Gangnam, Seoul
Bring the dates of your last few periods; they set the scan schedule. Illustrative photo.
Evidence
Do ovulation tests help you get pregnant? What the research says
The biology of the fertile window is well established. Whether timing sex with kits actually increases pregnancy rates is less certain: the trials are few, mostly from high-income countries, and often funded by kit makers, and most report pregnancy rather than live birth. The results suggest a modest benefit for couples who have been trying for less than a year, with low-certainty evidence.
Chance on ovulation day
Per-cycle probability of conception from sex on the day of ovulation; about 10% five days before.
Wilcox et al., NEJM, 1995 (221 women, 625 cycles)Pregnancy with timed sex
Estimated with urinary ovulation tests, vs 18% with untimed sex (6 studies, 2,374 women).
Cochrane review, Gibbons et al., ESHRE 2022Risk ratio for pregnancy
Home ovulation kits vs no kits, pooled from 3 trials; quality of evidence judged low.
Yeh et al., BMJ Glob Health, 2019Where benefit was seen
Couples trying for under a year; too little evidence for those trying longer.
Cochrane review, 2022Traveling to Seoul
Ovulation tracking in Seoul for international patients
Follicle tracking depends on your cycle, so it works best for women living in Seoul or staying for a week or more around the middle of their cycle. Hommage Women's Clinic is in Gangnam, a short walk from Sinnonhyeon Station (Line 9 and Shinbundang Line).
Planning your stay
- Message us by WhatsApp, KakaoTalk or the contact form with the first day of your last period and your usual cycle length, so we can suggest scan dates.
- For a regular 28-day cycle, plan to be in Seoul from about day 8 to day 16, with a progesterone blood test about 7 days after ovulation if you are still here.
- If your stay is short, a single scan plus hormone tests can still give useful information; the progesterone test can be repeated at home.
- Bring your passport, any kit results or cycle-app records, and previous scan or hormone reports.
You leave with a written summary of follicle sizes, lining thickness and blood results, so a doctor at home can continue your care.
Hommage · Seoul
Hommage Women's Clinic · Gangnam, Seoul
Seoul: the clinic is in Gangnam, a short walk from Sinnonhyeon Station. Illustrative photo.
Hommage · Gangnam
Hommage Women's Clinic · Gangnam, Seoul
Partners are welcome at results appointments. Illustrative photo.
Choosing well
How to choose a clinic for ovulation tracking in Seoul
Follicle tracking needs several visits at short notice, so practical details matter as much as equipment. Ask these questions:
- Does an OB/GYN specialist perform and read the scans? Measurements are most useful when the same doctor follows the whole cycle.
- Can I get scans at short notice? Follow-up scans are often needed one to three days apart, including Saturdays.
- Are blood tests available at the same visit? Progesterone, thyroid, prolactin and AMH save extra trips.
- Will they look for the cause if I do not ovulate? Treatment should follow a diagnosis, not just a prescription.
- Do I get a written summary and quote? Useful for insurance, your partner and doctors at home.
What affects the cost of ovulation testing in Korea?
Cost depends on the number of scans in your cycle, which blood tests are added, whether ovulation medication is monitored, and whether you are enrolled in National Health Insurance. Tests done for a medical reason such as irregular cycles or infertility are often covered, while some planning tests are not. You receive a written quote before testing begins.
Your visit
What to expect during ovulation tracking
01
Consultation
Dr. Park reviews your cycle history, any kit results, previous tests and how long you have been trying, then plans the scan schedule.
02
First scan
Usually around cycle day 8–12. The follicles and the lining of the uterus are measured with a short ultrasound.
03
Follow-up scans
Every 1–3 days until the leading follicle is ready or has released its egg. We tell you your most fertile days.
04
Confirmation
A scan and, about 7 days later, a progesterone blood test confirm ovulation. We discuss results and next steps.
Your doctor
Dr. Park Yuna
Medical Director · OB/GYN Specialist
Dr. Park performs and reads the follicle scans herself and combines them with your cycle history and blood tests, so you get a clear answer about whether and when you ovulate. If ovulation is not happening, she looks for the cause before suggesting treatment.
OB/GYN specialist (Korea) and representative director of Hommage Clinic. Leads the clinic's women's health care, from screening and infections to hormones, contraception and fertility checks.
Ovulation testing: frequently asked questions
When should I start using ovulation test kits?
Start testing a few days before you expect to ovulate. For a regular 28-day cycle, that usually means from about day 10 or 11. For longer cycles, subtract about 17 days from your usual cycle length to find a starting day. Follow your kit's instructions on timing, and test once or twice a day until it turns positive.
How many days after a positive LH test do you ovulate?
Ovulation usually happens about 24–36 hours after the LH surge begins. Your most fertile days are the day of the positive test and the following one to two days. Because sperm can survive for several days, having sex in the days just before ovulation also gives a good chance of pregnancy.
Can you get a positive ovulation test and not ovulate?
Yes. An LH kit detects the hormone surge, not the release of the egg. The surge can occur without ovulation, and women with PCOS may have high LH that gives repeated positive results. A follicle-tracking ultrasound or a mid-luteal progesterone blood test is needed to confirm that ovulation actually happened.
How many ultrasound scans do I need to track ovulation?
Most women need two to four scans in one cycle. The first is usually around day 8–12, followed by scans every 1–3 days until the follicle is mature or has ruptured. Irregular cycles or ovulation medication may need more visits. Each scan takes only a few minutes.
When should I see a doctor if I am not getting pregnant?
See a doctor after 12 months of regular unprotected sex if you are under 35, or after 6 months if you are 35 or older. Get checked sooner if you are over 40, have irregular or absent periods, known PCOS or endometriosis, or a history of pelvic infection. Early hormone testing can save time.
Can foreigners get ovulation testing in Seoul?
Yes. International patients and foreign residents can book ovulation tracking at Hommage Clinic. Bring your passport, or your residence card if you are enrolled in National Health Insurance, and the dates of your last few periods. Please contact us before your visit to arrange language support, and book an appointment early in your cycle.
What is the best time to have sex to get pregnant?
The fertile window is about six days long, ending on the day of ovulation. In a large study, the chance of conception per cycle was highest from sex on the day before and the day of ovulation, around a third on ovulation day. Having sex every one to two days through the window, rather than waiting for a positive test, gives the best chance.
What is folliculometry?
Folliculometry is another name for follicle-tracking ultrasound: a series of short transvaginal scans that measure the growing follicle and the uterine lining, then show that the follicle has released its egg. It is the most direct way to see ovulation. See pelvic ultrasound.
What follicle size means ovulation is near?
A leading follicle typically grows about 1–2 mm a day and ovulation often happens when it reaches around 18–25 mm. Size alone is not a guarantee, so Dr. Park also looks at the lining and, where useful, a progesterone test afterwards.
Do ovulation test kits work if I have PCOS?
They are less reliable. With PCOS, LH can stay high for much of the cycle, giving repeated or confusing positives. Follicle tracking and a progesterone blood test give a clearer answer. Read more about PCOS treatment.
When should the progesterone test be taken if my cycle is not 28 days?
Take it about 7 days before your next expected period, or about 7 days after ovulation if this was seen on a scan. For a 28-day cycle that is around day 21; for a 35-day cycle it is around day 28. If your period comes earlier or later than expected, the result is interpreted with that in mind.
Can ovulation testing tell me if I can get pregnant?
It shows whether and when you ovulate, which is one important part of fertility. Pregnancy also depends on open fallopian tubes, sperm quality, the uterus and egg quality, which relates mostly to age. If you have been trying for 12 months, or 6 if you are 35 or older, a fuller fertility assessment for both partners is advised.
How soon after stopping the pill can I test for ovulation?
You can start tracking from your first natural cycle. Many women ovulate again within a few cycles, but early cycles can be irregular and kit results harder to read. If your periods have not returned within a few months, book an assessment. See our birth control page.
References
Sources used for this page, reviewed by Dr. Park Yuna, OB/GYN specialist. Read our editorial and medical review policy.
- Wilcox AJ, Weinberg CR, Baird DD. Timing of sexual intercourse in relation to ovulation: effects on the probability of conception, survival of the pregnancy, and sex of the baby. N Engl J Med. 1995;333(23):1517–1521. doi:10.1056/NEJM199512073332301. PubMed
- Gibbons T, et al. Timed intercourse for couples trying to conceive. Cochrane Database of Systematic Reviews (CD011345); findings presented at ESHRE 2022. ESHRE summary
- Yeh PT, Kennedy CE, Van der Poel S, Matsaseng T, Bernard L, Narasimhan M. Should home-based ovulation predictor kits be offered as an additional approach for fertility management for women and couples desiring pregnancy? A systematic review and meta-analysis. BMJ Glob Health. 2019;4(2):e001403. PMC
- National Institute for Health and Care Excellence. Fertility problems: assessment and treatment (CG156). Mid-luteal progesterone to confirm ovulation.
This page is general information and does not replace a personal consultation. Illustrations are original works of Hommage Women's Clinic, Gangnam, Seoul; photos marked illustrative are not of patients.
Related fertility and cycle services
Hormone Testing
Cycle-timed blood tests for FSH, LH, estradiol, progesterone, thyroid and prolactin.
AMH Test
A blood test that estimates ovarian reserve to help with family and egg-freezing planning.
PCOS Treatment
Diagnosis and care for polycystic ovary syndrome, a common cause of irregular ovulation.
Pelvic Ultrasound
A quick scan of the uterus and ovaries to check follicles, cysts, fibroids and the lining.
Irregular Periods
Causes of late, missed or unpredictable periods and when to get checked.
Premarital Health Check
A women's health check before marriage or pregnancy, from ultrasound to immunity tests.
Know your fertile window with confidence
Book ovulation tracking with Dr. Park Yuna in Gangnam. Contact us early in your cycle so your first scan can be scheduled on the right day.
Hommage Clinic · 4F, Building A, 509 Gangnam-daero, Seoul (near Sinnonhyeon Station) · Mon & Fri 10:00–20:00 · Tue–Thu 10:00–19:00 · Sat 10:00–15:00