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.
Rhonda Patrick has a PhD in biomedical science and runs her own blood work obsessively. The omega-3 index. Magnesium RBC. Homocysteine. Tests most doctors don't know to order.
What matters: these tests aren't exotic. And Austin's cash-pay labs will run her full panel for $125–$295. Hospital billing: $400–$800 for the same.
Here are her five signature tests.
Test #1: Omega-3 Index
What it is: Percentage of EPA and DHA in red blood cell membranes. Rhonda targets 8%+. Most Americans: 4–5%.
Why she cares: Strong associations with lower cardiovascular risk, slower brain aging, reduced inflammation.
In Austin: $40–$80 at functional labs. Requires specialty lab, not standard Quest/LabCorp. Ask for "omega-3 index" or "erythrocyte fatty acid profile."
Any Lab Test Now stocks this. Browse wellness and longevity providers →
Test #2: Vitamin D (25-OH)
What it is: Storage form of vitamin D. Rhonda optimizes to 40–60 ng/mL. Affects immune function, cancer risk, bone health, mood.
Why most people are deficient: Indoor time, sunscreen, darker skin pigmentation. Most Americans below 30 ng/mL. Deficiency associated with higher all-cause mortality.
In Austin: $15–$45 at cash-pay labs. LaboratoryAssist charges around $15. Any Lab Test Now: $30–$45.
This is one of her most actionable tests. Deficiency is common. Treatment (D3 supplementation) is cheap. Retest confirms it worked.
Search Vitamin D testing in Austin →
Test #3: Magnesium RBC (Red Blood Cell Magnesium)
What it is: Standard serum magnesium is nearly useless — the body regulates blood magnesium tightly, stays "normal" even when you're depleted. Magnesium RBC measures what's actually inside the cells.
Why she cares: Magnesium is a cofactor for 300+ enzymatic reactions. DNA repair, ATP production, nerve signaling. Deficiency associates with sleep problems, muscle cramps, anxiety, cardiovascular risk. The catch: most doctors order serum magnesium, miss cellular deficiency, conclude you're fine.
In Austin: $30–$65. Request "magnesium RBC" specifically — standard "magnesium" won't work. Most functional medicine providers and some DPC practices have this.
Browse Austin functional medicine providers →
Test #4: Inflammatory Markers — hs-CRP and Homocysteine
Run both together to assess chronic inflammation and cardiovascular risk.
hs-CRP (High-Sensitivity C-Reactive Protein)
Low-grade inflammation marker. Standard CRP only detects acute inflammation (infections, injuries). hs-CRP catches chronic inflammation that predicts cardiovascular events years in advance. Rhonda targets below 1 mg/L.
Cash-pay: $15–$45.
Homocysteine
Amino acid that builds up when B-vitamin metabolism is compromised. Elevated homocysteine damages arterial walls. Cardiovascular risk factor most panels skip. Also flags MTHFR methylation issues.
Cash-pay: $25–$60.
Both available at LaboratoryAssist and Any Lab Test Now with or without doctor's order.
Search inflammation markers in Austin →
Test #5: Heat Stress / Sauna Protocol
Not a lab test — a practice Rhonda has published on based on Finnish epidemiology. People using saunas 4–7x weekly had dramatically lower cardiovascular disease and all-cause mortality rates.
In Austin: $20–$60 per session at dedicated wellness facilities or gym memberships. Infrared is everywhere — search sauna wellness options in Austin →.
Target: 20+ minutes at 174°F+ (79°C+). Traditional Finnish dry heat is what the research is based on. Infrared can work but dry heat is the gold standard.
Do It in Austin
Rhonda's tests are more specialized than standard clinic orders — but they're accessible. The omega-3 index and magnesium RBC need specific requests. Everything else is at Austin's cash-pay labs without friction.
Full panel (omega-3 index + vitamin D + magnesium RBC + hs-CRP + homocysteine) cash-pay: $125–$295 total. Hospital billing: $400–$800 for the same.
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.
Compare Prices on MarketCare
Search 500+ procedures across 600+ Austin providers. Find the best cash-pay price in seconds.
More from MarketCare
How Much Does a Colonoscopy Cost in Austin Without Insurance? (2026 Guide)
A screening colonoscopy in Austin costs $1,200–$4,000 cash-pay. Compare real prices from Austin ASCs and gastroenterologists. Save up to 70% vs hospitals.
How Much Does Hernia Surgery Cost in Austin? (2026 Cash-Pay Guide)
Hernia repair surgery in Austin costs $3,000–$8,000 cash-pay depending on the type. Compare open vs. laparoscopic hernia surgery prices from Austin providers.
Affordable Dental Care in Austin Without Insurance (2026 Price Guide)
Dental care in Austin costs $75–$5,000+ without insurance depending on the procedure. Compare cash-pay prices for cleanings, fillings, crowns, root canals, and more.