How to read ovulation test strips to determine ovulation

Jul 30, 2025 Source: Cainiu Health

Dr. Zhang Lu

Introduction

Under normal circumstances, ovulation test strips determine ovulation by detecting the peak level of luteinizing hormone (LH) in urine, with specific interpretation based on the color development of the test strip. Therefore, ovulation test strips assess ovulation by comparing the color intensity of the test line (T line) and the control line (C line). A positive result indicates impending ovulation; continuous monitoring can improve accuracy and is suitable for women who are trying to conceive to identify the optimal time for fertilization.

Generally, ovulation test strips determine ovulation by detecting the peak of luteinizing hormone (LH) in urine. The specific interpretation should be based on the color development of the test strip. The detailed analysis is as follows:

The test strip contains two lines: a control line (C line), which serves as a reference, and a test line (T line), which reflects the level of luteinizing hormone. If the T line color is lighter than the C line, the result is negative, indicating that the ovulation period has not yet arrived. If the T line color is as dark as or darker than the C line, the result is positive, suggesting possible ovulation within 24–48 hours. If no color develops on the T line, it may indicate improper operation or an expired test strip.

When using the strips, it is important to test at the same time each day and continue monitoring until a positive result appears. Once a positive result occurs, the testing frequency should be increased. For women with irregular menstrual cycles, testing can begin on day 10 of the menstrual cycle to avoid missing the LH peak.

Therefore, ovulation test strips determine ovulation by comparing the color intensity of the T line with that of the C line. A positive result indicates impending ovulation. Continuous monitoring can improve accuracy and is suitable for women attempting to conceive, helping them identify the optimal time for fertilization.

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How are the safe period and unsafe period calculated, exactly?

Generally, the "safe period" refers to the non-ovulatory phase when a woman is less likely to get pregnant, while the "danger period" refers to the ovulatory phase when pregnancy is more likely. The calculation of the safe and danger periods is mainly based on a woman's menstrual cycle and the day of ovulation. If the menstrual cycle is regular, ovulation typically occurs around 14 days before the next menstrual period begins. If the menstrual cycle is irregular, ovulation test strips can be used for detection.

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How to calculate the duration of pregnancy

Under normal circumstances, pregnancy refers to gestation. The gestation period is calculated from the first day of the last menstrual period, and the entire pregnancy lasts approximately 280 days, or 40 weeks. Women who are planning a pregnancy should also track their menstrual cycles during the preconception period and can use methods such as basal body temperature measurement and ovulation test strips to determine their ovulation period, thereby increasing the chances of conception.

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How large should follicles be before preparing for egg retrieval?

It is generally recommended to prepare for egg retrieval when the follicle size reaches 17-18 mm and there are 2-3 high-quality follicles. Ovulation should be monitored using ultrasound or ovulation test strips before egg retrieval. Additionally, it is important to stay relaxed and avoid excessive stress prior to the procedure. If egg quality is poor, folic acid supplementation may be taken under medical guidance for three months before egg retrieval to improve egg quality.

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The translation of "22号来月经排卵期是几号" into English is: **"If my period starts on the 22nd, on which day is my ovulation?"**

Under normal circumstances, calculating a woman's ovulation period requires consideration of her menstrual cycle. If experiencing discomfort or difficulty in conceiving, it is recommended to seek timely medical consultation and monitoring. When estimating the ovulation period, it should be noted that menstrual cycles may fluctuate due to emotional and lifestyle factors, so this method only provides a rough estimate. For those planning pregnancy, combining basal body temperature tracking and ovulation test strips can improve accuracy.