Normal LH (Luteinizing Hormone) and FSH (Follicle-Stimulating Hormone) ranges vary significantly by gender, age, and menstrual cycle phase, but generally, early cycle women might see FSH 3-10 mIU/mL and LH 2-8 mIU/mL, while post-menopause FSH rises above 20 mIU/mL, and males have different ranges (e.g., FSH 1.0-5.0 U/L). A key indicator is the LH:FSH ratio, often around 1:1 in fertile women but elevated (e.g., 2:1 or 3:1) in PCOS, disrupting ovulation, notes Contemporary OB/GYN.
FSH and LH are often both in the range of about 4-8 in young fertile women. In women with polycystic ovaries the LH to FSH ratio is often higher – for example 2:1, or even 3:1. With PCOS we often see the FSH in the range of about 4-8 as well – but often the LH levels are 10-20.
Usually, in healthy women, the ratio between LH and FSH usually lies between 1 and 2. In polycystic ovary disease women, this ratio becomes reversed, and it might reach as high as 2 or 3 (8). As a result of raised LH/FSH ratio, ovulation does not occur in polycystic ovary disease patients (9).
For women trying to conceive, a normal FSH level is crucial. Generally, anything below ten mlU/mL is considered ideal for pregnancy.
If you have an unusually high level of FSH at a young age, it may mean you have fewer eggs available to reach maturity. Since women with mild FSH elevation still menstruate regularly, the term is often referred to as diminished ovarian reserve (DOR). This is contrast to menopause when all eggs are exhausted.
Follicle-Stimulating Hormone (FSH)
High FSH levels can indicate a diminished ovarian reserve, suggesting that the ovaries may not be responding optimally to stimulation. Low FSH levels, on the other hand, may suggest that the ovaries are not properly functioning or that other hormonal imbalances are at play.
Follicle-stimulating hormone (FSH) and luteinizing hormone (LH) both play a key role in fertility. Without normal levels of FSH and LH, you can't get pregnant. Yet the ratio between these hormones can also affect your chances of pregnancy. If LH is disproportionately higher than FSH, you could have PCOS.
What are normal LH levels and why do they fluctuate? During the menstrual cycle, LH levels typically range from 1.9-14.6 IU/L during the follicular phase, 12.2-118.0 IU/L during the LH surge/ovulation, and 0.7-12.9 IU/L during the luteal phase.
Blood Tests
Your doctor may check your blood for levels of androgens, including testosterone, which tends to be higher in women with PCOS. He or she may also test your insulin levels, which are usually elevated in women with the condition.
PCOS is diagnosed by the presence of two of the following three characteristics: hyperandrogenemia and/or hyperandrogenism, oligo-/amenorrhea, and polycystic ovarian morphology.
LH Levels on Day 2
Measuring LH on this day helps assess if the hormonal balance is within the expected range. If LH is found to be at a higher level than FSH on Day 2, it may be taken as a sign of a hormonal imbalance often linked to conditions like PCOD.
If you have PCOS , you may not have periods very often. Or you may have periods that last many days. You may also have too much of a hormone called androgen in your body.
Interpretations include:
Here are general guidelines about what is considered “normal” for female fertility bloodwork. AMH level: The average range is between 1.0 ng/mL and 3.0 ng/mL. Estradiol level: 10 pg/mL to 300 pg/mL is considered normal. FSH level: 7 mlU/mL to 21.5 mlU/mL represents the normal range.
An FSH level of > 30 IU/L is consistent with the perimenopause, although FSH levels of 70-90 IU/L are not uncommon for postmenopausal women.
For example, it is typical for women with PCOS to have an LH level of about 18 mlU/ml and a FSH level of about 6 mlU/ml (notice that both levels fall within the normal range of 5-20 mlU/ml). This situation is called an elevated LH to FSH ratio or a ratio of 3:1.
These 4 methods can help to increase or balance FSH and LH naturally.
A surge in LH causes your ovary to release an egg around the second week of each menstrual cycle. A high LH level around this time means that you're at that moment in your cycle when you're most likely to get pregnant.
Continuous evaluation by cycle phase indicated that recent daily stress was associated with lower total and free E2 and LH during the follicular phase and with lower progesterone and higher FSH during the luteal phase.
The released FSH and LH travel through your bloodstream and then bind to receptors in the testes or ovaries (the gonads). This is how FSH, along with LH, can control the functions of the testes and ovaries.
Normal FSH ideally is under 10 miu/ml. The range of variations then is rather narrow. Levels of FSH over 20 can be an indicator of extremely low prognosis for spontaneous pregnancy or for various infertility treatments like insemination or IVF.
In your mid to late 30s, it may take a little longer or require a bit more effort to conceive than when you're younger. By your later 30s, you likely have around 25,000 eggs left. At this time, the rate at which you lose oocytes increases beyond 1,000 per month. There's nothing magical or final about age 35.
What are the signs and symptoms of hormonal imbalance?
Fertility Signs in Women
Symptoms like increased cervical mucus, changes in basal body temperature, or mild pain on one side of the abdomen can indicate ovulation. Cervical Mucus: Nearing ovulation, cervical mucus becomes abundant, clear, stretchy, and slippery.