FirstCall Performance Medicine

STRONGER. LEANER. FASTER.
MEASURED.

Add mass or shed it, build speed or stay durable — a physician builds your athlete's protocol from real numbers and measures it at every step. It started with Dr. Petersen's own son.

How it works →See the transformation

How It Works · The FirstCall Method

This isn't a supplement stack. It's a physician-built protocol.

Every athlete moves through the same physician-run method — the same rigor whether they're a freshman walk-on or chasing a scholarship. Measure first. Build the protocol second. Re-measure to prove it.

Measure

Real numbers first — body composition, VO₂ max, a full performance blood panel, and a cardiac screen. No guessing what to fix.

Physician-Built Protocol

Dr. Petersen turns the data into one plan — fuel, supplements, training zones, recovery — and signs off on it before it ever reaches your family.

Re-Measure

We scan and test again on a set cadence. Progress you can see in real numbers — and exactly what to adjust next.

Measure First · Guess Never

The Performance Lab

It's not a metaphor — it's a room in our clinic, where every number gets measured under a physician's eye. Tap any measurement to see what it is, why it matters, and how it works.

Body Composition

Styku 3D Body Scan

See exactly what your body is made of — and watch it change.

~35s Per scan2–4% vs. DXAFully Clothed

Learn more →Aerobic Engine

VO₂ Max Test

Measure the size of your engine — then train off real numbers.

10–15m Test timeGold StandardTrue HR zones

Learn more →Inside the Athlete

Journeys Performance Blood Panel

We look inside before we build a single plan.

40+ MarkersMD Reviewed1 Blood draw

Learn more →Safety First

EKG — Cardiac Screen

We clear the heart before we clear the athlete.

~5m PainlessMD ReadJul 2026 FL requirement

Learn more →

Tour the Performance Lab →

Physician-Led

The protocol has a doctor's name on it.

Two board-certified physicians — decades in the emergency department, where seconds decide outcomes — stand behind every athlete FirstCall takes.

Dr. Erik Petersen, DO

Founder · Board-Certified Physician

Board-certified in Internal Medicine & Pediatrics with 20+ years directing high-volume emergency departments across four states, and a member of TeamHealth's Mobile Elite Team. He engineered the protocol that guided his own son from a high-school wrestler to signing with the Carolina Panthers — and built FirstCall to bring that same physician oversight to every athlete.

Board-Certified · ABIM (Med-Peds)20+ Years Emergency MedicineLicensed in 18 States

Dr. William Carlson, MD

Co-Founder & Chief Medical Officer

Board-certified in Family Medicine and an emergency-department medical director with more than 20,000 hours of frontline care. He is also a Certified Athletic Trainer — a rare pairing of physician and trainer — and leads FirstCall's clinical protocols, quality, and the physician oversight behind every plan.

Board-Certified · Family Medicine (ABFM)ED Medical DirectorCertified Athletic Trainer

The Proof · Measured

An eight-year build. Measured the whole way.

High school to the Carolina Panthers — safe, gradual, physician-guided. Drag across the timeline and read every verified weigh-in. A build with receipts, not a before-and-after.

Parker Petersen at 245 lb — Father Ryan HS

Parker Petersen at 320 lb — Carolina Panthers

Junior year · High-school wrestler

Measured bodyweight

195LB

Drag across the timeline →

Six verified weigh-ins across roughly eight years, high school to the Carolina Panthers. A gradual, physician-guided build — not a bulk. Only measured bodyweight is shown.

See the full transformation →

The Training Room

Your physician, on call.

Membership means direct access to Dr. Petersen. Book a Performance Check by secure video — labs review, a protocol adjustment, or a second opinion when it counts. No waiting room. No runaround.

Enter the Training Room →

Fuel