Trying to understand your fertility can feel overwhelming. You may have regular periods but still wonder whether you are ovulating, or you may be experiencing irregular cycles, hormonal symptoms, or difficulty becoming pregnant without knowing why.
Fertility testing helps provide information about the hormones, organs, and biological processes involved in reproduction. However, there is no single blood test that can definitively tell someone whether they can or cannot become pregnant.
Instead, fertility evaluation typically involves a combination of:
- Medical and reproductive history
- Hormone blood tests
- Ovulation assessment
- Ovarian reserve testing
- Imaging or other procedures
- Semen analysis when a male partner is involved
At Test Smartly Labs, patients in Overland Park, Kansas City-Waldo, and Independence can access convenient laboratory testing that will help evaluate hormonal and health factors related to fertility.
This guide explains the most common fertility tests, what they measure, when they may be performed, and what your results can—and cannot—tell you.
What Is Fertility Testing?
Fertility testing refers to medical tests used to investigate factors that may affect a person’s ability to conceive or maintain a pregnancy.
For women, testing may assess:
- Whether ovulation is occurring
- Ovarian reserve
- Menstrual cycle hormones
- Thyroid function
- Prolactin levels
- Conditions that may disrupt ovulation
- Uterine or fallopian tube health
For men, fertility evaluation may assess:
- Sperm count
- Sperm movement
- Sperm shape
- Reproductive hormones
- Testicular or ejaculatory function
- Certain genetic or medical conditions
A complete fertility evaluation should consider both partners when applicable. Male factors, female factors, combined factors, and unexplained infertility can all contribute to difficulty conceiving. The CDC notes that male infertility evaluation commonly involves a medical history, physical examination, and semen analysis.
Quick Answer: Which Blood Tests Check Fertility?
Depending on your symptoms, menstrual cycle, medical history, and healthcare provider’s recommendations, fertility-related blood testing may include:
- Anti-Müllerian Hormone, or AMH
- Follicle-Stimulating Hormone, or FSH
- Luteinizing Hormone, or LH
- Estradiol
- Progesterone
- Prolactin
- Thyroid-Stimulating Hormone, or TSH
- Testosterone
- Other androgen tests
- Pregnancy testing
- General health tests such as a CBC, CMP, blood sugar, or vitamin testing when relevant
Each test answers a different question. For example, progesterone may help indicate whether ovulation occurred, while thyroid testing can help identify thyroid dysfunction that may affect menstrual cycles and fertility.
When Should You Consider Fertility Testing?
Professional guidance generally recommends an infertility evaluation after:
- 12 months of regular, unprotected intercourse when the female partner is younger than 35
- Six months of trying when the female partner is 35 or older
Testing may be appropriate sooner when there is a known condition or history that could affect fertility.
You may want to speak with a healthcare provider earlier if you have:
- Irregular or absent periods
- Very short or unusually long menstrual cycles
- Severe pelvic or menstrual pain
- A history of endometriosis
- Polycystic ovary syndrome, or PCOS
- Previous pelvic infections
- Prior pelvic or reproductive surgery
- Recurrent pregnancy loss
- A history of chemotherapy or radiation
- Suspected early menopause
- A known uterine or fallopian tube condition
- A male partner with known reproductive concerns
- Difficulty with ejaculation or sexual function
- A history of testicular injury, surgery, or infection
Fertility testing may also be considered by people who are not currently trying to conceive but need a medical evaluation because of irregular cycles, reproductive symptoms, fertility-preservation planning, or upcoming treatment that could affect reproductive function.
Signs That a Fertility Evaluation May Be Helpful
Infertility does not always cause obvious symptoms. For many couples, the first sign is simply that pregnancy has not occurred after months of trying.
Possible signs of a reproductive or hormonal issue include:
- Irregular periods
- Missing periods
- Cycles shorter than approximately 21 days
- Cycles longer than approximately 35 days
- Extremely heavy bleeding
- Severe menstrual pain
- Pelvic pain
- Unexplained weight changes
- New or excessive facial hair
- Persistent acne
- Hair thinning
- Milky nipple discharge when not breastfeeding
- Hot flashes
- Vaginal dryness
- Low sex drive
- Erectile or ejaculatory difficulties
- Testicular pain or swelling
These symptoms do not confirm infertility, but they can provide useful clues about which tests may be appropriate.
How Does Female Fertility Work?
Pregnancy depends on several biological steps occurring successfully.
Generally:
- An egg develops inside an ovarian follicle.
- Hormonal signals cause the egg to mature.
- Ovulation releases the egg from the ovary.
- Sperm travels through the reproductive tract.
- Fertilization usually occurs in a fallopian tube.
- The fertilized egg travels toward the uterus.
- The embryo implants in the uterine lining.
- Hormones support the developing pregnancy.
Difficulty at any stage may reduce the likelihood of pregnancy.
Hormone tests can help assess certain parts of this process, particularly ovarian function and ovulation. However, blood tests alone cannot confirm whether the fallopian tubes are open, whether the uterine cavity is normal, whether fertilization is occurring, or whether an embryo will implant.
That is why fertility bloodwork is often one component of a broader evaluation.
Common Fertility Blood Tests for Women
Anti-Müllerian Hormone Test
Anti-Müllerian Hormone, commonly called AMH, is produced by cells surrounding developing follicles in the ovaries.
AMH testing is commonly used as a marker of ovarian reserve, meaning the estimated quantity of remaining recruitable follicles.
An AMH test may help with:
- Estimating ovarian response to fertility medication
- Planning an IVF cycle
- Evaluating possible diminished ovarian reserve
- Supporting assessment of certain ovulatory conditions
- Fertility-preservation discussions
Unlike some reproductive hormones, AMH can often be measured on different days of the menstrual cycle.
However, AMH has important limitations.
A lower AMH level does not prove that natural pregnancy is impossible. A higher AMH level does not guarantee pregnancy. Ovarian reserve testing primarily provides information about egg quantity and likely response to ovarian stimulation—not egg quality or a person’s exact chance of conceiving naturally.
The American Society for Reproductive Medicine explains that ovarian reserve markers are poor standalone predictors of natural reproductive potential and should not be used as general fertility screening tests for people who do not meet criteria for infertility.
Follicle-Stimulating Hormone Test
Follicle-Stimulating Hormone, or FSH, is produced by the pituitary gland. In women, FSH helps stimulate the development of follicles in the ovaries.
FSH is often tested during the early part of the menstrual cycle, frequently around cycle days two through four. It may be evaluated alongside estradiol because estradiol levels can influence how an FSH result is interpreted.
FSH testing may help assess:
- Ovarian function
- Ovarian reserve
- Irregular or absent periods
- Possible perimenopause or menopause
- Suspected primary ovarian insufficiency
A higher early-cycle FSH level may be associated with reduced ovarian reserve, but one result should not be interpreted alone. Hormone levels can fluctuate from cycle to cycle, and normal ranges may differ between laboratories.
Estradiol Test
Estradiol is a form of estrogen produced primarily by the ovaries.
It helps:
- Develop ovarian follicles
- Build the uterine lining
- Regulate the menstrual cycle
- Support reproductive tissues
Estradiol may be measured early in the cycle alongside FSH or later during fertility treatment to monitor follicle development. An unexpectedly elevated estradiol level early in the menstrual cycle can sometimes suppress FSH and make the FSH result appear more reassuring than it would otherwise.
FSH and estradiol are therefore commonly interpreted together when ovarian function is being evaluated.
Luteinizing Hormone Test
Luteinizing Hormone, or LH, is produced by the pituitary gland.
A rise in LH helps trigger ovulation.
LH testing may help evaluate:
- Whether ovulation is approaching
- Irregular menstrual cycles
- Possible PCOS
- Pituitary or ovarian hormone problems
At-home urine ovulation tests also detect an LH surge. However, an LH surge predicts that ovulation may occur; it does not prove that an egg was successfully released.
Blood testing may provide additional information when cycles are irregular, or results are difficult to interpret.
Progesterone Test
Progesterone is produced after ovulation by a temporary ovarian structure called the corpus luteum.
Its primary reproductive roles include:
- Preparing the uterine lining for implantation
- Supporting the early stages of pregnancy
- Helping maintain the second half of the menstrual cycle
A progesterone blood test may be used to help determine whether ovulation occurred. It is often described as a “day 21” test, but that timing only fits someone with a regular 28-day cycle. A more individualized approach is to test approximately seven days before the next expected period.
For example:
| Typical Cycle Length | Approximate Progesterone Testing Time |
| 26 days | Around day 19 |
| 28 days | Around day 21 |
| 30 days | Around day 23 |
| 35 days | Around day 28 |
A single progesterone result can support evidence of recent ovulation, but levels naturally fluctuate. Your healthcare provider should interpret the result according to the timing of your cycle and the reason for testing.
ACOG identifies progesterone testing as one of the blood tests that may be used to assess whether ovulation has occurred.
Prolactin Test
Prolactin is the hormone involved in breast milk production.
When prolactin is abnormally elevated outside pregnancy or breastfeeding, it may interfere with reproductive hormones and disrupt ovulation.
Possible symptoms of elevated prolactin include:
- Irregular periods
- Missing periods
- Milky nipple discharge
- Reduced sex drive
- Difficulty becoming pregnant
- Headaches or vision changes in some cases
Prolactin is not necessarily required in every routine fertility evaluation. ASRM advises that it should be ordered when symptoms or clinical findings suggest it may be relevant rather than used automatically for every patient.
Stress, exercise, sleep, medications, and even the blood-draw experience can sometimes affect prolactin levels. An abnormal result may therefore need to be repeated or evaluated further.
Thyroid-Stimulating Hormone Test
Thyroid-Stimulating Hormone, or TSH, helps evaluate thyroid function.
Both underactive and overactive thyroid conditions can affect:
- Menstrual regularity
- Ovulation
- Energy levels
- Weight
- Pregnancy health
Possible thyroid-related symptoms include:
- Fatigue
- Unexplained weight gain or loss
- Feeling unusually cold or hot
- Hair thinning
- Constipation or diarrhea
- Palpitations
- Anxiety
- Irregular periods
ACOG includes thyroid-function testing among the blood tests that may be used during an infertility evaluation because thyroid disorders may contribute to reproductive difficulties.
Depending on the initial TSH result and symptoms, a healthcare provider may also order free T4 or thyroid antibody testing.
Testosterone and Other Androgen Tests
Testosterone and related androgen hormones are present in both women and men.
In women, elevated androgen levels may be associated with conditions that disrupt ovulation, including PCOS.
Testing may be considered when symptoms include:
- Irregular periods
- Excess facial or body hair
- Persistent acne
- Scalp hair thinning
- Difficulty ovulating
Additional testing may include:
- Total testosterone
- Free testosterone
- DHEA-S
- Sex hormone-binding globulin
- 17-hydroxyprogesterone in selected cases
No single hormone test can independently diagnose PCOS. Diagnosis generally requires the healthcare provider to consider menstrual history, symptoms, laboratory findings, and sometimes ultrasound results.
Pregnancy Test
A pregnancy test measures human chorionic gonadotropin, or hCG.
It may be ordered during fertility evaluation to:
- Rule out pregnancy before certain tests
- Confirm a suspected pregnancy
- Monitor very early pregnancy when medically necessary
- Help evaluate missed periods
A blood pregnancy test may detect lower concentrations of hCG than many urine tests and may provide a quantitative result showing the measured level.
General Health Tests That May Support a Fertility Evaluation
Reproductive health is connected to overall health. Depending on your symptoms, a healthcare provider may recommend additional laboratory testing.
Complete Blood Count
A Complete Blood Count, or CBC, measures red blood cells, white blood cells, hemoglobin, hematocrit, and platelets.
It may help identify concerns such as:
- Anemia
- Certain infections
- Blood-related abnormalities
A CBC is not a direct fertility test, but untreated anemia or another health issue may affect overall wellness and pregnancy preparation.
Comprehensive Metabolic Panel
A Comprehensive Metabolic Panel, or CMP, provides information about:
- Blood sugar
- Electrolytes
- Kidney function
- Liver function
- Protein levels
It may be useful when reviewing general health before pregnancy or investigating symptoms that occur alongside menstrual or hormonal concerns.
Blood Sugar and Hemoglobin A1C
Insulin resistance and abnormal blood sugar can be associated with irregular ovulation, particularly in some people with PCOS.
Testing may include:
- Fasting blood glucose
- Hemoglobin A1C
- Other metabolic tests ordered by a healthcare provider
Improving blood-sugar control can be an important part of overall reproductive and pregnancy health when diabetes or prediabetes is present.
Vitamin D Testing
Vitamin D supports bone health, immune function, and many other biological processes.
Low levels are common, but a vitamin D result does not independently diagnose a fertility problem.
Testing may still be appropriate when:
- Deficiency is suspected
- A person has limited sun exposure
- There are bone-health concerns
- A healthcare provider is reviewing nutritional health before pregnancy
Vitamin B12 and Iron Testing
Vitamin B12, iron, and folate help support healthy blood-cell production and overall health.
Testing may be considered when symptoms include:
- Fatigue
- Weakness
- Dizziness
- Shortness of breath
- Pale skin
- Numbness or tingling
- Heavy menstrual bleeding
These are not direct measures of fertility, but identifying deficiencies can support general health and pregnancy planning.
Fertility Testing for Men
Fertility testing should not focus only on the female partner.
Male reproductive factors may involve:
- Low sperm count
- Reduced sperm movement
- Abnormal sperm shape
- Hormonal problems
- Testicular conditions
- Ejaculatory problems
- Genetic factors
- Previous infections or injuries
- Certain medications or environmental exposures
The primary laboratory test for male fertility is usually a semen analysis.
A semen analysis may assess:
- Semen volume
- Sperm concentration
- Total sperm count
- Sperm motility
- Sperm morphology
- Other characteristics of the sample
Because semen results can vary, an abnormal result may need to be repeated.
Depending on the medical history and semen-analysis findings, a healthcare provider may order hormone tests such as:
- Testosterone
- FSH
- LH
- Prolactin
- Thyroid testing
Blood hormone testing does not replace semen analysis. It helps investigate possible hormonal causes when clinically appropriate.
Does Testosterone Testing Show Male Fertility?
Not by itself.
Testosterone is important for reproductive and sexual function, but a normal testosterone result does not guarantee normal sperm production.
Likewise, low testosterone does not reveal the complete cause of a fertility problem.
A male fertility evaluation may need to consider:
- Semen analysis
- Testosterone
- FSH and LH
- Medical history
- Physical examination
- Testicular health
- Medications
- Prior injuries or infections
Men using prescribed or non-prescribed testosterone should tell their healthcare provider. External testosterone can suppress the hormonal signals needed for sperm production, even when it improves blood testosterone levels.
Can a Blood Test Tell How Many Eggs You Have?
Not exactly.
AMH, FSH, and estradiol can provide information about ovarian reserve, but they do not count the exact number of eggs remaining.
Ovarian reserve testing also cannot directly determine:
- Egg quality
- Whether fertilization will occur
- Whether a pregnancy will implant
- Whether a person will conceive naturally
- How long someone will remain fertile
- The exact age at which menopause will occur
Age remains an important factor because egg quantity and average egg quality decline over time. However, two people of the same age can have different reproductive histories, ovarian reserve results, and fertility outcomes.
Ovarian reserve tests are most useful when interpreted by a clinician in the context of age, cycle history, ultrasound findings, and treatment goals.
Does a Normal Fertility Test Guarantee Pregnancy?
No.
Normal bloodwork is encouraging, but pregnancy requires more than normal hormone levels.
Factors that blood testing may not fully assess include:
- Fallopian tube blockage
- Uterine abnormalities
- Endometriosis
- Egg quality
- Sperm function
- Fertilization
- Embryo development
- Implantation
A person may have normal fertility hormone results and still experience difficulty conceiving. Conversely, someone with an abnormal ovarian reserve result may still become pregnant.
Fertility results should be viewed as pieces of a larger clinical picture—not as a simple pass-or-fail result.
What Other Tests May Be Included in a Fertility Evaluation?
Blood testing is only one part of a comprehensive evaluation.
A healthcare provider or fertility specialist may also recommend:
Pelvic Ultrasound
An ultrasound can help evaluate:
- Ovaries
- Follicles
- Uterine structure
- Fibroids
- Ovarian cysts
- Certain signs associated with PCOS
An antral follicle count performed by ultrasound may also contribute to ovarian reserve assessment.
Hysterosalpingogram
A hysterosalpingogram, or HSG, uses imaging and contrast material to help determine whether the fallopian tubes are open and evaluate the shape of the uterine cavity.
Blood tests cannot determine whether the fallopian tubes are blocked.
Sonohysterography or Hysteroscopy
These procedures may be used to evaluate the inside of the uterus for concerns such as:
- Polyps
- Fibroids
- Scar tissue
- Structural abnormalities
ACOG lists ultrasound, sonohysterography, hysterosalpingography, and hysteroscopy among the imaging tests and procedures that may be used during an infertility evaluation.
Semen Analysis
When sperm is part of the conception process, semen analysis is an essential component of evaluation rather than something that should automatically be delayed until all female tests are complete.
When During Your Cycle Should Fertility Hormones Be Tested?
Timing depends on the hormone being measured and the question being investigated.
| Test | Common Timing |
| AMH | Often tested on various cycle days |
| FSH | Commonly early in the cycle |
| Estradiol | Commonly early in the cycle with FSH |
| LH | May be tested near expected ovulation or as part of a hormone evaluation |
| Progesterone | Usually about seven days before the expected period |
| Prolactin | Timing varies; preparation instructions may be provided |
| TSH | Can generally be tested on different cycle days |
| Testosterone | Timing may depend on symptoms and provider instructions |
| hCG | Based on suspected pregnancy and clinical need |
Do not assume every fertility hormone should be measured on cycle day 21.
A cycle-day recommendation should be based on your actual cycle length and the purpose of the test.
Do You Need to Fast Before Fertility Testing?
Many fertility hormone tests do not require fasting.
However, fasting may be requested when the same blood draw includes:
- Fasting glucose
- Insulin testing
- A lipid panel
- Certain metabolic tests
Your preparation may also depend on:
- Medications
- Supplements
- Hormonal birth control
- Time of day
- Stage of the menstrual cycle
Hormonal medications can influence some reproductive hormone results. ACOG notes, for example, that FSH and estradiol values may be altered by hormonal preparations when evaluating suspected primary ovarian insufficiency.
Do not stop birth control, fertility medication, thyroid medication, or any other prescribed treatment unless your healthcare provider instructs you to do so.
How to Prepare for Fertility Bloodwork
Before your appointment:
- Confirm which tests have been ordered.
- Ask whether they must be completed on a particular cycle day.
- Record the first day of your last menstrual period.
- Tell your provider about irregular cycles.
- Bring a list of medications and supplements.
- Ask whether fasting is required.
- Follow instructions regarding morning collection when provided.
- Avoid changing medication without medical guidance.
It may also help to track:
- Cycle length
- Ovulation test results
- Menstrual bleeding patterns
- Pelvic pain
- Previous pregnancies
- Pregnancy losses
- How long you have been trying to conceive
This information can help your healthcare provider interpret the laboratory results more accurately.
What Can Cause Fertility Hormone Results to Change?
Hormone levels can be affected by:
- Menstrual cycle timing
- Age
- Pregnancy
- Hormonal birth control
- Fertility medications
- Stress
- Sleep
- Exercise
- Weight changes
- Thyroid conditions
- PCOS
- Menopause or perimenopause
- Pituitary conditions
- Ovarian surgery
- Chemotherapy or radiation
- Certain medications
An abnormal result does not always mean permanent infertility.
Your healthcare provider may recommend:
- Repeating a test
- Testing on a different cycle day
- Comparing several hormones
- Adding ultrasound or imaging
- Reviewing medications
- Referring you to a reproductive specialist
Common Causes of Fertility Problems
Difficulty conceiving can result from many factors.
Possible female-related causes include:
- Ovulation disorders
- PCOS
- Diminished ovarian reserve
- Primary ovarian insufficiency
- Thyroid disorders
- Elevated prolactin
- Endometriosis
- Blocked fallopian tubes
- Fibroids or uterine abnormalities
- Age-related reproductive changes
Possible male-related causes include:
- Low sperm production
- Poor sperm motility
- Abnormal sperm morphology
- Hormonal disorders
- Testicular injury or disease
- Ejaculatory problems
- Genetic conditions
Sometimes both partners have contributing factors. In other situations, standard testing does not reveal a clear cause, which may be described as unexplained infertility.
Fertility Testing at Test Smartly Labs
At Test Smartly Labs, we provide convenient laboratory testing for individuals investigating fertility, menstrual-cycle concerns, hormone health, and overall wellness.
Our Kansas City-area testing locations include:
- Overland Park, KS
- Kansas City-Waldo, MO
- Independence, MO
Depending on the test selected, current availability, and your healthcare provider’s recommendations, fertility-related and supporting laboratory testing may include:
- Female hormone testing
- Progesterone testing
- Testosterone testing
- Thyroid testing
- Pregnancy blood testing
- Complete Blood Count
- Comprehensive Metabolic Panel
- Vitamin D testing
- Vitamin B12 testing
- Iron-related testing
- Blood-sugar testing
- General wellness panels
Test Smartly Labs offers:
- Professional specimen collection
- Convenient testing options
- Confidential service
- Accurate laboratory processing
- Results that can be shared with your healthcare provider
Laboratory testing can provide valuable information, but it does not replace evaluation by an OB-GYN, reproductive endocrinologist, urologist, or other qualified healthcare provider.
Frequently Asked Questions About Fertility Testing
Is there one test that tells me whether I am fertile?
No. Fertility depends on multiple factors, and no single blood test can guarantee or rule out pregnancy.
What is the most important female fertility test?
There is no universally most important test. The appropriate testing depends on your age, symptoms, cycle history, how long you have been trying, and whether there are known medical concerns.
Can AMH tell me whether I can get pregnant naturally?
AMH provides information about ovarian reserve and expected response to ovarian stimulation. It does not independently predict whether you will conceive naturally.
Can fertility testing detect ovulation?
A properly timed progesterone test can provide evidence that ovulation recently occurred. LH testing or urine ovulation kits may help predict when ovulation is approaching.
What hormone imbalance can make it difficult to conceive?
Thyroid dysfunction, elevated prolactin, ovulatory disorders, abnormal androgen levels, diminished ovarian function, and other hormonal conditions may affect conception.
Is an irregular period a sign of infertility?
Irregular periods do not automatically mean infertility, but they may indicate irregular or absent ovulation. A healthcare provider can help determine which hormone tests are appropriate.
Can I have regular periods and still experience infertility?
Yes. Regular cycles often suggest ovulation, but fertility may still be affected by fallopian tube conditions, endometriosis, uterine factors, sperm-related factors, age-related changes, or unexplained causes.
Should both partners be tested?
When both egg and sperm are involved, evaluating both partners can help avoid delays and provide a more complete picture.
Is fertility testing only for people who cannot get pregnant?
No. Testing may also be appropriate for irregular periods, suspected hormonal problems, fertility-preservation planning, recurrent pregnancy loss, or before medical treatments that may affect reproductive function.
Can birth control affect fertility blood-test results?
Hormonal contraception may alter certain reproductive hormone and ovarian reserve measurements. Tell your healthcare provider what you are taking before testing.
Final Thoughts
Fertility testing can help answer important questions about ovulation, ovarian function, reproductive hormones, thyroid health, and other factors that may affect conception.
However, fertility is too complex to be summarized by a single number.
AMH may provide information about ovarian reserve, progesterone may help confirm ovulation, and thyroid or prolactin testing may identify hormone disruptions. These tests are most valuable when interpreted alongside your age, symptoms, cycle history, partner evaluation, imaging, and medical history.
Anyone younger than 35 who has been trying to conceive for 12 months, or age 35 or older who has been trying for six months, should consider discussing an infertility evaluation with a qualified healthcare provider. Earlier evaluation may be appropriate when periods are irregular or a known reproductive concern is present.
For individuals seeking convenient fertility-related blood testing in Overland Park, Kansas City-Waldo, or Independence, Test Smartly Labs provides professional, confidential laboratory services that can help you gather important health information and take a more informed next step.
