Lab Work Explained: The 5 Numbers Every Adult Should Know

I've reviewed thousands of lab results over my 18-year career. And I've noticed something consistent: most people don't know their numbers. They get bloodwork done, receive a letter saying "everything's normal," and move on.

But "normal" and "optimal" are very different things. And knowing five key numbers can give you tremendous power over your health trajectory.

Here are the 5 lab values I believe every adult should know and understand.

1. Blood Pressure

What it measures: The force of blood against your artery walls.

Optimal range: Less than 120/80 mmHg

Why it matters: High blood pressure is called the "silent killer" because it usually has no symptoms until serious damage occurs. It's the leading modifiable risk factor for heart disease and stroke.

What to do if it's high:

• Reduce sodium intake (aim for less than 2,300mg/day)
• Increase potassium-rich foods (bananas, sweet potatoes, leafy greens)
• Exercise 150+ minutes per week
• Manage stress — easier said than done, but it matters
• See your physician if consistently above 130/80

2. Fasting Blood Glucose (or A1C)

What it measures: Your blood sugar level (glucose) or your 3-month blood sugar average (A1C).

Optimal ranges:

• Fasting glucose: 70-90 mg/dL
• A1C: Below 5.5%

Why it matters: Elevated blood sugar — even before you hit "diabetic" levels — damages blood vessels, increases inflammation, promotes weight gain, and accelerates aging. Prediabetes affects over 96 million American adults, and most don't know it.

What to do if it's elevated:

• Prioritize protein and fiber at every meal
• Reduce refined carbohydrates and added sugars
• Exercise regularly (both cardio and strength training help)
• Consider medical intervention if lifestyle changes aren't enough — this is where GLP-1 medications can be transformative

3. Cholesterol — The Full Picture

What it measures: LDL ("bad"), HDL ("good"), triglycerides, and total cholesterol.

Optimal ranges:

• LDL: Below 100 mg/dL (below 70 if high-risk)
• HDL: Above 40 mg/dL for men, above 50 for women (higher is better)
• Triglycerides: Below 150 mg/dL
• Total cholesterol: Below 200 mg/dL

Why it matters: Cholesterol is the foundation of cardiovascular risk assessment. But here's what most people miss — the RATIO matters as much as individual numbers. High LDL with low HDL is concerning. High total cholesterol with excellent HDL may be less worrisome.

What to do if it's off:

• Increase omega-3 fatty acids (fish, walnuts, flaxseed)
• Exercise consistently — this is one of the best ways to raise HDL
• Reduce saturated fat and trans fats
• Add fiber (oats, beans, vegetables)
• Discuss statin therapy with your physician if numbers are significantly elevated

4. Thyroid (TSH)

What it measures: Thyroid-stimulating hormone, which indicates how well your thyroid gland is functioning.

Optimal range: 0.5-2.5 mIU/L (tighter than the lab "normal" range of 0.4-4.5)

Why it matters: Your thyroid controls your metabolism. An underactive thyroid (hypothyroidism) causes weight gain, fatigue, brain fog, cold intolerance, hair loss, and depression. It's incredibly common — especially in women — and often goes undiagnosed because labs show "normal" TSH when it's actually suboptimal.

What to do if it's off:

• If TSH is above 2.5, discuss further testing (Free T3, Free T4, antibodies)
• Ensure adequate iodine and selenium in your diet
• Manage stress (cortisol directly affects thyroid function)
• If diagnosed with hypothyroidism, medication is highly effective and well-tolerated

5. Vitamin D

What it measures: 25-hydroxyvitamin D, the storage form of vitamin D in your body.

Optimal range: 40-60 ng/mL

Why it matters: Vitamin D deficiency is epidemic — even in sunny Atlanta. Low vitamin D is linked to fatigue, depression, weakened immunity, weight gain, muscle weakness, bone loss, and increased cancer risk. It's one of the most impactful deficiencies to correct.

What to do if it's low:

• Supplement with Vitamin D3 (most adults need 2,000-5,000 IU daily)
• Get 15-20 minutes of sun exposure daily when possible
• Include vitamin D-rich foods (fatty fish, egg yolks, fortified foods)
• Recheck levels after 3 months of supplementation

The Precision Health Approach to Lab Work

At Precision Health, we don't just order labs and send you a letter. Here's what makes our approach different:

1. We test more thoroughly — our comprehensive panel includes all five numbers above plus additional markers
2. We explain everything — in plain language, not medical jargon
3. We show you optimal ranges — not just the lab's "normal" range
4. We create action plans — specific, actionable steps to improve your numbers
5. We follow up — we recheck and track your progress over time

Knowledge is power. But knowledge plus action is transformation.

Get Your Numbers

If you haven't had comprehensive lab work in the past year, now is the time. Our lab panels start at $150 and include a physician review of your results.

Book your lab work today or text us at 404-496-6028 to schedule.

Your numbers tell a story. Let's make sure you understand it.