🏃‍♀️ Female Athlete / Missing Periods (RED-S)

♀ Built for women · 10 markers · $182.70 with code CAMERON ~~$203.00~~

Training hard with absent or irregular periods, recurrent stress fractures, persistent fatigue, or unexplained performance decline. Also anyone with a history of restrictive eating.

🩸 Order this exact panel — 10% off

All 10 markers load into your cart in one click. No doctor's visit, drawn at any Quest location in the US, results by email in about two weeks. Code CAMERON applies automatically.

Add all 10 markers — $182.70 → Open the full Bloodwork Vault →

Why this panel

Relative Energy Deficiency in Sport is what happens when energy intake doesn't cover training load. The body downregulates reproduction, thyroid output and bone building. It is common, serious, and frequently celebrated as discipline rather than recognised as pathology.

💡 What most people missLosing your period is not a normal adaptation to training — it's the clearest signal that you're under-fuelled, and the bone loss it causes can be permanent. The lab fingerprint is distinctive: low LH and FSH alongside low estradiol (the axis is switched off centrally, unlike menopause where FSH is high), plus low FT3 with a normal TSH as the thyroid downshifts to conserve energy. That low-FT3-normal-TSH pattern gets dismissed as normal constantly, and it's the single most sensitive marker of under-fuelling here.

⏰ When to get it drawnMorning, fasted, ideally not the day after a hard session. Cortisol must be drawn before 9am to be interpretable.

What's inside

This panel covers 10 markers chosen for this specific situation. The full list, the clinical reasoning behind each marker, draw timing and how to interpret your results are available to Academy members.

🔒 Panel and protocol are inside the Academy

Every marker and why it's here — plus the full evidence-graded RED-S / Female Athlete protocol: the low-LH-low-FSH-low-oestradiol signature that separates energy deficiency from every other cause, the low-T3-normal-TSH pattern everyone calls normal, why the pill protects bone less than transdermal, and what recovery actually takes. $10/mo, cancel anytime.

Unlock the full panel →

A few of the markers — free to read

These explainers are free: what each one measures, the optimal range rather than just the lab range, and what actually moves it.

Cortisol (AM)Free T3 (Triiodothyronine)LH & FSH Estradiol, Sensitive [LC/MS-MS]

Frequently asked questions

What blood tests are in the Female Athlete / Missing Periods (RED-S) panel?

10 markers: LH & FSH, Estradiol, Sensitive [LC/MS-MS], Free T3 (Free Triiodothyronine), TSH (Thyroid-Stimulating Hormone), Cortisol, IGF-1 (Insulin-like Growth Factor 1), Ferritin, Vitamin D (25-Hydroxy), Complete Blood Count (CBC) w/ Differential, Comprehensive Metabolic Panel (CMP).

How much does the Female Athlete / Missing Periods (RED-S) panel cost?

$203.00 before discount, $182.70 with code CAMERON applied automatically. Individual markers add a one-time $10 draw fee. Ordered through Marek Diagnostics and drawn at any Quest Diagnostics location in the US.

Do I need a doctor's order for these tests?

No. These are ordered direct-to-consumer through Marek Diagnostics — you order online, walk into a Quest location, and results are emailed to you in about two weeks. No physician visit or insurance required. Not available in NY, NJ or RI.

When should I get the Female Athlete / Missing Periods (RED-S) panel drawn?

Morning, fasted, ideally not the day after a hard session. Cortisol must be drawn before 9am to be interpretable.

Important: This page is education only, not medical advice and not a diagnosis. A panel is a starting point for a conversation with a clinician, not a substitute for one. Reference ranges vary by laboratory and assay — always compare against the range printed on your own report.