Functional lab guide

Beyond "Normal": Hormonal Vitality

Why symptoms and laboratory reference intervals do not always tell the same story, and how to prepare for a more useful health conversation.

Start with the red flags

A lab value is only one part of the picture. Patterns in your day-to-day experience can help identify which systems deserve attention.

Metabolic engine

  • Energy crashes or brain fog after carbohydrate-heavy meals
  • Shakiness, intense hunger or irritability when a meal is delayed
  • Persistent mid-afternoon caffeine or sugar cravings
  • Changes in central weight or difficulty regulating appetite

Hormonal symphony

  • Pelvic pain, irregular cycles or heavy bleeding
  • Mood changes, adult acne or hair changes
  • Breast tenderness, migraines or fertility concerns

Thyroid and iron patterns

  • Cold hands and feet, morning puffiness or brain fog
  • Hair thinning, restless legs or breathlessness with usual activity
  • Heavy limbs, fatigue or reduced exercise tolerance

Liver and digestive cleanup

  • Bloating that builds through the day
  • Heightened smell sensitivity or feeling unusually unwell after alcohol
  • Skin changes or waking around the same time overnight
The master lab chart

Reference versus functional targets

Use this table to prepare questions, not to self-diagnose or change treatment.

MarkerGuide's standard rangeGuide's optimal targetWhy it may matter
Fasting insulin<170 pmol/L20-50 pmol/LInsulin patterns can add context to PCOS, energy and metabolic health.
HbA1c<6.0%4.8-5.2%A longer-view estimate of average blood sugar.
Ferritin15-150 ng/mL70-100 ng/mLIron storage marker interpreted with CBC, symptoms and inflammation.
TSH0.5-5.0 mIU/L1.0-1.5 mIU/LA key thyroid signal that may be reviewed with free hormones and symptoms.
Free T33.5-6.5 pmol/L5.0-6.0 pmol/LThe active thyroid hormone; interpretation depends on context and assay.
hs-CRP<8 mg/L<1 mg/LA nonspecific inflammatory marker with cardiovascular relevance.
GGT5-50 U/L10-20 U/LA liver enzyme that can add metabolic and liver context.
Vitamin D75-250 nmol/L125-150 nmol/LStatus should be interpreted with dose, season, risks and clinical goals.

Ranges vary by laboratory, method, age, sex, pregnancy status and medical context. Do not start iron, vitamin D, thyroid or hormone treatment from this chart without individualized guidance.

When blood work is not enough

Advanced tools for selected questions

01

Dried urine hormones

May add hormone metabolite information in selected cases.

02

Microbiome mapping

Can explore specific digestive questions when results will change care.

03

Organic acids

Offers a metabolic snapshot with important interpretation limits.

04

Cycle mapping

Tracks symptoms and cycle timing across a full month.

05

Cortisol rhythm

Maps selected stress and sleep patterns across the day.

06

Clinical history

The essential tool that gives every result its meaning.

From data to design

  1. Download complete results from your laboratory portal, including dates and reference intervals.
  2. Highlight symptoms and markers you want explained, especially changes over time.
  3. Bring the information to a clinician who can connect it to your history and decide what deserves follow-up.
Virtual care across Ontario

Bring your data. Leave with direction.

A clinical review can help separate meaningful patterns from numbers that do not need action.

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