Rhonda Patrick's Top 5 Health Tests (Most People Have Never Heard Of)
Rhonda Patrick's biomarker obsessions — omega-3 index, magnesium RBC, hs-CRP, homocysteine, Vitamin D — and where to get them cheap in Austin.
Most people who follow Rhonda Patrick know she has a PhD in biomedical science and talks about things your doctor has probably never mentioned — or at least never ordered. The omega-3 index. Magnesium RBC. Homocysteine. She's been running her own blood work religiously and publishing the results for years.
What gets less attention is how accessible these tests actually are if you know where to look. Not all of them are exotic. Some are cheap. A few are genuinely hard to find unless you know to ask specifically.
Here are her five signature tests — and where to get them in Austin.
Test #1: Omega-3 Index
What it is: Measures the percentage of EPA and DHA (the two primary omega-3 fatty acids) in your red blood cell membranes. Rhonda considers an omega-3 index above 8% the target. Most Americans are at 4–5%.
Why she cares: Strong associations with lower cardiovascular risk, slower brain aging, reduced inflammation. The research is more robust than most supplement categories.
In Austin, this test runs $40–$80 at functional labs. It requires a specialty lab — not the same Quest/LabCorp panel your doctor normally orders. Ask specifically for "omega-3 index" or "erythrocyte fatty acid profile."
Any Lab Test Now stocks this one. For functional medicine providers who run this routinely, browse wellness and longevity providers →
Test #2: Vitamin D (25-OH)
What it is: Serum 25-hydroxyvitamin D — the storage form that reflects your actual vitamin D status. Rhonda optimizes her level to 40–60 ng/mL and takes this seriously as a factor in immune function, cancer risk reduction, bone health, and mood.
Why most people are deficient: Spending most of the day indoors, sunscreen use, and darker skin pigmentation all reduce vitamin D synthesis. Most Americans sit below 30 ng/mL. Deficiency is associated with higher all-cause mortality in population studies.
In Austin, this test runs $15–$45 at cash-pay labs. LaboratoryAssist charges around $15. Any Lab Test Now typically runs $30–$45.
This is one of the most actionable tests in her catalog — deficiency is common, treatment (D3 supplementation) is cheap, and follow-up testing confirms whether it worked.
Search Vitamin D testing in Austin →
Test #3: Magnesium RBC (Red Blood Cell Magnesium)
What it is: Standard serum magnesium tests are almost meaningless — the body regulates blood magnesium tightly, so it stays "normal" even when you're depleted. Magnesium RBC measures magnesium inside red blood cells, where depletion actually shows up.
Why she cares: Magnesium is a cofactor for 300+ enzymatic reactions. It's involved in DNA repair, ATP production, and nerve signaling. Deficiency is associated with sleep problems, muscle cramps, anxiety, and elevated cardiovascular risk. The catch: most doctors order serum magnesium, miss cellular deficiency, and conclude everything's fine.
In Austin, the RBC magnesium test runs $30–$65. You'll need to specifically request "magnesium RBC" — the standard "magnesium" order won't give you this. Most functional medicine providers and some DPC practices stock this.
Browse Austin functional medicine providers →
Test #4: Inflammatory Markers — hs-CRP and Homocysteine
Two tests Rhonda runs together to assess chronic inflammation and cardiovascular risk.
hs-CRP (High-Sensitivity C-Reactive Protein) The low-grade inflammation marker. Standard CRP only detects acute inflammation (infections, injuries). High-sensitivity CRP catches the low-level chronic inflammation that predicts cardiovascular events years in advance. Rhonda aims for below 1 mg/L.
Cash-pay in Austin: $15–$45.
Homocysteine An amino acid that builds up when B-vitamin metabolism is compromised. Elevated homocysteine damages arterial walls and is a cardiovascular risk factor that most standard panels skip. It's also one of the markers that can flag MTHFR methylation issues — something Gary Brecka has made famous separately.
Cash-pay in Austin: $25–$60.
Both available at LaboratoryAssist and Any Lab Test Now with or without a doctor's order.
Search inflammation markers in Austin →
Test #5: Heat Stress / Sauna Protocol
This isn't a lab test — it's a practice Rhonda has published extensively on based on Finnish epidemiological data. People who used saunas 4–7x per week had dramatically lower rates of cardiovascular disease and all-cause mortality in the cohort she cites most often.
In Austin, sauna access runs $20–$60 per session at dedicated wellness facilities, or through gym memberships that include sauna access. Infrared saunas are everywhere now — search sauna wellness options in Austin →.
If you're doing Rhonda's protocol, the target is 20+ minutes at 174°F+ (79°C+) — traditional Finnish-style, not just "warm room." Infrared can work but she's explicit that traditional dry heat is what the research is based on.
Do It in Austin
Rhonda's tests are more specialized than what most clinics order by default — but they're not hard to get. The omega-3 index and magnesium RBC require some specificity when ordering. Everything else is available at Austin's cash-pay labs without a runaround.
Running her full panel (omega-3 index + vitamin D + magnesium RBC + hs-CRP + homocysteine) at cash-pay labs in Austin: $125–$295 total. Through hospital billing, you'd easily pay $400–$800 for the same tests.
Written by
Jamie Torres
Healthcare Writer & Cost Researcher
Jamie spent three years uninsured after leaving a corporate job to freelance. After getting blindsided by a $2,400 MRI bill she could have paid $264 for, she started writing about healthcare pricing so other Austinites don't have to learn the hard way.
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