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Tan Xiaojun
·Senior reproductive medicine expert
·Postdoctoral fellow at Peking University
·PhD candidate at Xiangya School of Medicine, Central South
University
·Master’s tutor at Central South University
· Master's degree candidate in reproductive
medicine at the University of South China
· Professional training at Huazhong University
of Science and Technology and Tongji
Hospital Reproductive Center
Expertise:
diagnosis and treatment of infertility, first/second/third generation IVF (including
egg/sperm donation), microsperm retrieval, embryo freezing and resuscitation, artificial
insemination (including husband's sperm and sperm donation), paternity testing, chromosomal
disease
diagnosis, high-throughput gene sequencing, endometrial receptivity gene testing and other
clinical
technology applications. Many of these technologies are at the leading level both domestically
and
internationally.
FSH is close to 15, is it a temporary fluctuation, or is the ovary reminding you, ovarian reserve function evaluation, what to do if FSH is too high, AMH examination, basic follicle AFC, hormone examination on the second to third day of menstruation, Guangzhou assisted reproductive assessment, and six interpretations of progesterone preparation.
What if FSH is close to 15? Six judgment points are clear: Is it short-term fluctuation or is the ovarian reserve signaling?
When FSH approaches 15, is it a temporary fluctuation, or is the ovary reminding you that many people's first reaction is anxiety. This paper systematically explains the medical logic behind the increase of FSH and the next evaluation direction from the aspects of index meaning, applicable population, examination process and common questions and answers.
Definition: FSH is close to 15, first look at "what it stands for" and then look at "what it can explain"
FSH is follicle stimulating hormone, which is secreted by pituitary gland and participates in follicular recruitment and development. The FSH level of women in the early follicular phase of menstruation is often used to assist in judging the ovarian reserve status. In medicine, the increase of FSH usually indicates that the feedback of ovary to pituitary stimulation is weakened. In other words, the body needs to secrete more FSH to promote follicular development.
But there is a common misunderstanding here: FSH is not a "single judgment on fertility". The American Society for Reproductive Medicine (ASRM) pointed out that ovarian reserve test can help to evaluate ovarian reactivity, especially the ovulation-promoting reaction in assisted reproduction, but it can not accurately predict the natural fertility alone, nor should it be regarded as the only conclusion.
Therefore, seeing that "FSH is close to 15", the correct understanding should be:
It is a risk signal.
Not the final diagnosis
It is necessary to combine the detection time, estradiol (E2), AMH, basal follicle number (AFC), age and menstrual condition.
Expert tips
The FSH is close to 15, which is more like a "warning light that needs to be reviewed" than a conclusion that "the opportunity has been lost". A single test is abnormal, which is usually not enough to draw a conclusion directly in clinic.
Crowd: Who needs to pay more attention to the result that FSH is close to 15?
Not everyone who sees FSH close to 15 represents the same problem. Clinical judgment first depends on the background of the crowd.
1. People over 35 years old who have been pregnant for a long time.
With the increase of age, the number of follicles and the quality of oocytes will decrease. Both ASRM and ACOG emphasize that age is still an important variable to evaluate fertility potential, and ovarian reserve index is more an auxiliary reference.
If such people appear at the same time:
Decreased menstrual flow
Cycle shortening
AMH decline
AFC deficiency
Then the clinical significance of FSH close to 15 will be stronger, which often suggests that ovarian reserve is more likely to decline.
2. People whose menstruation is still regular, but whose FSH is found to be high by chance.
This kind of situation is most likely to cause misjudgment. Studies and guidelines suggest that the detection of ovarian reserve in women with regular menstruation cannot predict the natural pregnancy probability in the next 6-12 months alone. In other words, even if the FSH of people with regular menstruation is high, they can't conclude that "natural pregnancy is hopeless" only by this one.
3. People with previous history of ovarian surgery, clever cyst, pelvic inflammatory disease and radiotherapy and chemotherapy.
This group of people themselves belong to the group with high risk of ovarian reserve damage. If FSH rises, it is more necessary to do systematic evaluation as soon as possible, rather than long-term observation and waiting. ASRM pointed out that ovarian reserve detection has practical value in such clinical decision-making.
4. People with obvious abnormalities such as menstrual disorder, amenorrhea and hot flashes.
If FSH is close to 15, accompanied by obvious menstrual abnormalities, even amenorrhea, hot flashes, night sweats and other manifestations, it can not be understood only by "the decline of ordinary ovarian reserves." In some cases, early-onset ovarian insufficiency (POI) needs further investigation. Relevant guidelines suggest that if there is diagnostic uncertainty, FSH needs to be re-examined after several weeks, and it is not appropriate to judge only one result.
Technology: Why is FSH "falsely high" or "undervalued"?
This is the key to understanding this question. FSH is close to 15, which may be a real signal or influenced by detection conditions.
1. The detection time is wrong, and the result may be distorted.
FSH in the evaluation of ovarian reserve is usually detected on the 2nd-3rd day of menstruation, and it is best to look at it together with estradiol (E2). Because of different cycle stages, FSH will have physiological fluctuations. ASRM and related consensus emphasize that early follicular phase detection is more meaningful.
2. Estradiol is high, which may "depress" FSH.
Sometimes FSH is not high, but it should be higher, but it is covered by high E2. Therefore, FSH and E2 are often required to be interpreted in pairs in clinic, not just FSH.
3. Hormone contraceptives and recent hormone intervention may affect judgment.
ASRM pointed out that it would be more reliable to keep a certain observation time after stopping hormonal contraception and then evaluate ovarian reserve indexes such as AMH or AFC. Although different indicators are affected to different degrees, the general principle is that the reference value of a single test will decrease when the hormone environment changes.
At present, common clinical joint assessments include:
Evaluate the main significance and limitations of the project.
FSH reflects that pituitary stimulation to ovary fluctuates obviously, which is influenced by E2.
E2-assisted judgment of whether FSH is covered up is of limited significance.
The auxiliary index of AMH reflecting the number of follicular pools cannot directly represent the egg quality.
The number of basal follicles seen by AFC through ultrasound is influenced by the operator's experience.
Age is highly correlated with egg quality and cannot reflect individual differences.
ASRM clearly pointed out that AMH, AFC and basic FSH can help predict ovulation induction reaction, but their ability to predict natural birth outcome is limited, so they should be comprehensively explained.
Expert tips
What is really meaningful about "FSH approaching 15" is not the number itself, but whether it is consistent with age, AMH, AFC and menstrual pattern. The higher the consistency, the more reliable the conclusion.
Q&A: About FSH approaching 15, the five most common clinical problems.
Question 1: FSH is close to 15, does it necessarily mean that ovarian function is poor?
Not necessarily.
There are three reasons:
The single result may be influenced by cycle time and experimental conditions.
FSH reflects "recruitment pressure", not all fertility.
Some people have elevated FSH, but they still ovulate, and may naturally conceive within a certain period of time.
ASRM mentioned that in some prospective studies, even if FSH is higher than 10 IU/L, the cumulative pregnancy rate of some women in natural attempted pregnancy is not significantly lower than that of the normal group. The core of this conclusion is not that "FSH is not important", but that it cannot be used as a single conclusion tool.
Question 2: FSH is close to 15, which is more likely to fluctuate temporarily, or ovarian decline?
It depends on the background information and cannot be generalized.
You can use a simplified judgment framework:
If you are older, AMH decreases, AFC decreases, and menstrual amount decreases, it is more supportive of the decline of ovarian reserve.
If menstruation is regular, only once abnormal, and the detection time is not standard, it is more likely to need to be rechecked to eliminate fluctuations.
If accompanied by menstrual disorder or amenorrhea, it is necessary to further investigate the endocrine or ovarian function problems.
Confidence rating: medium-high.
The basis is that the existing guidelines have a clear consensus on FSH joint assessment, but there are still great differences among individuals.
Question 3: FSH is close to 15, can you still get pregnant naturally?
Whether to continue natural pregnancy is not decided by FSH alone.
More importantly:
age
Is there regular ovulation?
Is the fallopian tube unobstructed?
Semen condition
Are AMH and AFC descending synchronously?
ESHRE guidelines point out that ovarian reserve test is not suitable for predicting the probability of natural pregnancy alone in women with regular menstruation. In other words, whether to continue natural pregnancy or not depends on the whole infertility assessment, not on a test sheet.
Question 4: FSH is close to 15, can we only make test tubes as soon as possible?
No.
However, if the following conditions are met, it is indeed necessary to enter the reproductive specialist evaluation process as soon as possible:
Older
Pregnant for more than 6–12 months without pregnancy.
AMH decreased significantly.
AFC is low
Poor previous reaction to promoting excretion
Combined with fallopian tube or male factor
ASRM believes that the detection of ovarian reserve is valuable in the formulation of assisted reproductive programs, especially for predicting ovulation induction and selecting initial stimulation programs.
Question 5: FSH is close to 15, does it mean that the quality of eggs must be poor?
You can't just draw an equal sign.
Ovarian reserve reflects more "quantity and reactivity", while egg quality is more closely related to age. Clinically, it is common that "the quantity declines earlier than the quality declines obviously", and it can also be seen that "the quantity is acceptable but the age-related quality declines". Therefore, FSH suggests risks, but it does not mean directly judging the outcome of embryos.
Process: After finding that FSH is close to 15, it is recommended to follow these four steps.
In order to avoid excessive anxiety or delay in evaluation, it is safer to judge according to the process.
Step 1: Confirm the detection conditions.
Check the following information first:
Whether to draw blood on the 2nd-3rd day of menstruation?
Whether to detect E2 at the same time?
Do you take hormone drugs during the cycle?
Whether staying up late recently, acute illness, and obvious fluctuations in living conditions.
If these conditions are not ideal, the interpretation value of a single result will decrease.
Step 2: Complete the joint evaluation indicators.
It is suggested to discuss with the doctor whether to further improve it:
AMH
AFC (Yin Chao Basic Follicle Count)
LH、E2
menstrual history
Tubal assessment
Male semen analysis
Because the clinical infertility outcome is often not caused by a single factor. MedlinePlus also explicitly mentions the female infertility examination, and the evaluation usually includes hormones, ovulation, tubal and pelvic conditions.
Step 3: Make decisions based on age and time window.
The general logic is:
Young, regular menstruation, single abnormality: can be judged after standard review.
Over 35 years old and pregnant for a long time: long-term observation is not recommended.
With obvious abnormal menstruation or previous high-risk history: enter the specialist evaluation as soon as possible.
The key here is not to "speed up blindly", but to avoid wasting time waiting for incomplete information. Because the age factor itself will not be reversed.
Step 4: Review instead of repeatedly scaring yourself.
If there is diagnostic uncertainty, relevant POI guidelines suggest repeating FSH detection after several weeks. The significance of reexamination is not mechanical repetition, but to see whether the results are consistently abnormal and consistent with symptoms and other indicators.
Summary box
The correct order after FSH is close to 15 is: first check the detection conditions, then make a joint evaluation, and finally make a decision based on age and pregnancy preparation time.
Drawing conclusions first and then making up the examination will often amplify anxiety and make it easy to misjudge.
Summary: FSH is close to 15, and the key point is not "panic", but "how to look at it"
Back to the core question: FSH is close to 15, is it a temporary fluctuation or is the ovary reminding you?
The more rigorous answer in medicine is:
It may be fluctuation, or it may be a hint of declining ovarian reserve.
Single FSH can't be characterized independently.
If it coexists with age, AMH decline, AFC decrease and menstrual changes, more attention should be paid to it.
If the detection conditions are not standardized or only abnormal once, review and joint evaluation are more important.
The value of FSH is mainly to assist in evaluating ovarian response, rather than to determine natural conception or final pregnancy outcome alone.
From the first principle, FSH is not a "destiny number", but a signal in the body feedback system. What really determines the next step is not a certain value, but whether this value is put in a complete reproductive evaluation framework and whether it is mutually confirmed with other evidence.
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