What Labs Should I Check Before Trying to Get Pregnant?

Why your labs matter before you start trying

If you are planning to get pregnant in the next six to twelve months, the best time to look under the hood is now, before you start trying. Your labs tell us what that environment actually looks like.

Here is what I see over and over in my practice. A woman goes to her OB/GYN, gets a basic panel, hears that everything is “normal,” and is told to keep trying. Months go by. When it still is not happening, the next answer is often “I don’t know,” followed quickly by a referral for IVF. There is a whole missing middle ground between those two places, and that is where a deeper set of labs lives.

Below are the five areas we look at with every woman preparing for pregnancy, and why each one matters.

A comprehensive blood panel is the foundation. It shows us how your metabolism, hormones, blood sugar, inflammation, and nutrient stores are working together, and it often explains the “everything is normal but something is off” feeling.

Full thyroid, not just TSH

Your thyroid sets the pace for nearly every cell in your body, including your ovaries and the uterine lining. Most standard panels check TSH alone. TSH is a signal from your brain asking the thyroid to work, so it tells us how loudly the brain is asking, not how well the thyroid is answering.

A full thyroid panel includes:

• TSH, the brain’s signal to the thyroid
• Free T4, the storage form of thyroid hormone
• Free T3, the active form your cells actually use
• Reverse T3, which can rise with stress, inflammation, or under-eating and block T3 from doing its job
• TPO and thyroglobulin antibodies, which flag autoimmune thyroid activity (Hashimoto’s)

Those antibodies matter more than most women are told. Thyroid autoimmunity has been linked to a higher risk of miscarriage, even when TSH looks fine.

And because a growing baby relies entirely on mom’s thyroid hormone for roughly the first trimester, we want your thyroid running well before conception, not catching up after. Many fertility-focused clinicians, myself included, like to see TSH sitting in a tighter range than the standard lab cutoff when you are trying to conceive.

The rest of the panel

Beyond thyroid, I want to see:

• Blood sugar and insulin: fasting glucose, fasting insulin, and HbA1c. Insulin resistance is a major driver of irregular ovulation and PCOS, and it is often missed when only glucose is checked.
• Iron status: ferritin and a full iron panel. Low iron stores are common in women who menstruate and can affect energy, egg quality, and your reserves going into pregnancy, when iron needs climb.
• Inflammation: hs-CRP and homocysteine. Elevated homocysteine can point to a methylation issue and a higher need for active forms of folate and B12.
• Reproductive hormones: AMH for a snapshot of ovarian reserve, plus FSH, LH, estradiol, prolactin, testosterone, DHEA-S, and SHBG.
• Metabolic basics: a CBC, a comprehensive metabolic panel, and a lipid panel. Cholesterol is the raw material your body uses to make sex hormones.

Timing matters for some of these markers. FSH, LH, and estradiol are typically drawn on day 2 to 4 of your cycle, while progesterone is drawn mid-luteal. Getting the timing right is the difference between useful data and noise.

A blood draw gives us a single snapshot on a single day. Your hormones move across the entire month. Mira lets us watch the whole movie instead of one frame.

Mira is an at-home device that reads urine test wands and gives you actual hormone numbers, not just a positive or negative line. We love the Ultra4 wand, since it measures:

• LH, the surge that triggers ovulation
• E3G, an estrogen metabolite that rises as a follicle matures and signals your fertile window opening
• PdG, a progesterone metabolite that confirms ovulation actually happened
• FSH, which reflects how hard your brain is working to recruit a follicle

That last piece of confirmation is a big deal. A standard ovulation strip tells you LH surged. It does not tell you whether you released an egg. Many women have LH surges without a clear progesterone rise afterward, and they would never know without measuring it.

When we track a few cycles with Mira, we can see when your fertile window truly opens, whether you are ovulating, how long and how strong your luteal phase is, and whether patterns like a slow estrogen rise or a short luteal phase are showing up.

It also takes the guesswork out of timing, which takes a lot of stress out of trying. That data then guides what we adjust, and we can watch the next cycles to see whether the changes are working.

Pregnancy is one of the most nutrient-demanding things your body will ever do. You are building an entire human from the raw materials you have on hand, and your body will prioritize the baby, often at your expense. Walking into pregnancy with full stores protects both of you.

Standard blood work mostly measures what is floating in your serum at the moment of the draw. A micronutrient test looks deeper at what your cells have absorbed and are able to use, which can look very different. You can have a “normal” serum level and still be functionally low inside the cell.

The nutrients I pay closest attention to before conception include:

• Folate, B12, and B6, which drive methylation, DNA synthesis, and neural tube development in the earliest weeks, often before you know you are pregnant
• Zinc and selenium, which support egg quality, thyroid conversion, and antioxidant defense
• Magnesium, which supports blood sugar balance, progesterone, and stress resilience
• Iodine, which the thyroid needs to make hormone for you and, later, the baby
• Vitamin D, which plays a role in immune balance, egg quality, and implantation
• Choline, which is critical for the baby’s brain development and is low in many diets
• Antioxidants like CoQ10, glutathione, and vitamins C and E, which protect developing eggs from oxidative stress

This is where testing beats guessing. A generic prenatal is a good start, but it cannot correct a deficiency it does not know about, and more is not always better. Results let us build a targeted plan, and with that 90-day egg maturation window, the sooner we start, the more those eggs benefit.

This is the test that surprises people the most, and it is one of the ones I would least want to skip. Your gut is where you absorb every nutrient, where a large share of your immune system lives, and where a lot of your hormone balance is quietly managed.

A comprehensive stool test looks at:

• Pathogens and overgrowth: bacteria, parasites, yeast, and H. pylori that create low-grade inflammation and drain your resources
• Your microbiome balance: whether beneficial bacteria are present in healthy numbers
• Digestion and absorption: markers like pancreatic elastase and fecal fat that show whether you are actually breaking down food
• Inflammation and gut lining health: markers like calprotectin and zonulin
• Immune function: secretory IgA, your gut’s first line of defense
• Beta-glucuronidase: an enzyme that affects how much estrogen gets recycled back into circulation

That last marker is a good example of why the gut matters so much for hormones. A group of gut bacteria, often called the estrobolome, helps decide whether used estrogen leaves your body or gets reabsorbed. When that system is off, estrogen can build up, which can show up as heavy periods, PMS, or an imbalance with progesterone.

The gut also connects back to everything above. If you are not absorbing well, the best prenatal in the world will not fix your micronutrient status. And your microbiome is the starting point for your baby’s, since babies are seeded with mom’s bacteria during birth and early life. Cleaning up the gut before pregnancy is far easier than trying to do it during.

We live in a world full of chemicals our bodies were never designed to handle, and many of them act like hormones. These endocrine disruptors can mimic estrogen, block hormone signaling, and add to oxidative stress on developing eggs. A total toxin test measures what is actually stored and circulating in your body so we know what we are dealing with.

Depending on the panel, a total toxin test can look at:

• Environmental chemicals like phthalates, parabens, BPA, and pesticides, which come from plastics, personal care products, and food
• Heavy metals like lead, mercury, and arsenic, which can come from water, fish, older homes, and some cosmetics
• Mycotoxins, which are produced by mold in water-damaged buildings and are far more common than most people think, especially in humid climates

Here is the part that matters most for timing. Some of these compounds, including certain metals, can cross the placenta. We also do not want to actively mobilize stored toxins during pregnancy or breastfeeding, because what gets pulled out of storage moves through your bloodstream.

That makes the months before conception the right window to find out what you are carrying and support your body in clearing it. The good news is that this is one of the most actionable results you can get.

Putting it all together

None of these tests tells the whole story on its own. The power is in reading them together. Low ferritin on your blood panel might trace back to poor absorption on your stool test. A short luteal phase on Mira might connect to a thyroid pattern, low magnesium, or estrogen recycling in the gut. Elevated homocysteine might line up with low intracellular B vitamins. When we see the full picture, we stop chasing symptoms and start working on root causes.

How we can help at Nuvitru

This is exactly why I built our 12-Week Fertility Program. After eleven years in women’s health, I kept watching women fall into that gap between basic labs and IVF, so I designed a program to fill it.

Every woman in the program gets a comprehensive stool test, total toxin test, micronutrient test, and a Mira hormone monitor, along with a personalized compounded fertility supplement and a clinical team that reads all of it together and builds a plan around your body.

We offer the program in person at our clinic in Lakeway, and virtually for women anywhere in the country.

If you are thinking about pregnancy, or you have been trying and still do not have answers, you deserve more than “everything looks normal.”