What Blood Tests Should You Actually Get Every Year?

Most people only get blood work when something is already wrong. A doctor orders tests because you have symptoms, and by that point you are already behind. The entire point of annual blood testing is to catch trends before they become problems — to see your fasting glucose creeping up years before a diabetes diagnosis, or your vitamin D tanking every winter without you realizing why you feel terrible.

The problem is that a standard annual physical — if your doctor even orders blood work — usually includes a bare minimum panel. It misses several markers that are cheap, widely available, and genuinely useful for anyone trying to stay healthy long-term.

Here is the panel you should actually be requesting, what each test tells you in plain language, and how often to recheck.

The Essential Annual Panel

1. Complete Blood Count (CBC)

What it measures: Red blood cells, white blood cells, hemoglobin, hematocrit, platelets.

What it tells you: Whether you are anemic, fighting an infection, have inflammation, or have issues with blood clotting. It is the most basic overview of your blood health.

What to watch for: Low hemoglobin (anemia — common in women and vegetarians). Elevated white blood cells (infection or chronic inflammation). Low platelets (clotting risk).

How often: Annually. More frequently if you have known anemia or immune issues.

2. Comprehensive Metabolic Panel (CMP)

What it measures: Blood glucose, kidney function (BUN, creatinine), liver enzymes (ALT, AST), electrolytes (sodium, potassium, calcium), protein levels.

What it tells you: How your kidneys and liver are functioning, whether your blood sugar is well-regulated, and whether your electrolytes are balanced.

What to watch for: Fasting glucose above 100 mg/dL (pre-diabetes territory). Elevated liver enzymes (can indicate fatty liver, medication effects, or alcohol impact). Abnormal kidney markers.

How often: Annually.

3. Lipid Panel

What it measures: Total cholesterol, LDL cholesterol, HDL cholesterol, triglycerides.

What it tells you: Your cardiovascular risk profile. But the standard lipid panel is only the starting point.

What to watch for: High LDL is the primary driver of atherosclerotic cardiovascular disease. Low HDL and high triglycerides together suggest metabolic dysfunction. The ratio of triglycerides to HDL is one of the most useful quick indicators of insulin resistance — ideally below 2:1.

Worth adding: ApoB (apolipoprotein B) is a better predictor of cardiovascular risk than LDL alone. It counts the actual number of atherogenic particles in your blood. Many lipidologists now consider ApoB the single most important cardiovascular biomarker. Ask for it specifically — it is inexpensive but not included in standard panels.

How often: Annually. Every 6 months if you are actively managing cardiovascular risk or have started a statin.

4. Hemoglobin A1c (HbA1c)

What it measures: Your average blood sugar over the past 2-3 months.

What it tells you: Whether you are on the path toward insulin resistance or diabetes, long before a single fasting glucose reading would show a problem.

What to watch for: Below 5.7% is normal. 5.7-6.4% is prediabetes. 6.5%+ is diabetes. Ideally you want to be below 5.4%.

Why it matters: Fasting glucose is a snapshot of one morning. HbA1c is a 90-day moving average. You can have a normal fasting glucose and still have an elevated HbA1c if your blood sugar spikes significantly after meals.

How often: Annually. Every 3-6 months if you are in the prediabetic range and making lifestyle changes.

5. Thyroid Panel (TSH + Free T4)

What it measures: Thyroid stimulating hormone (TSH) and free thyroxine (T4).

What it tells you: Whether your thyroid is functioning properly. Your thyroid controls metabolism, energy, body temperature, weight regulation, and mood.

What to watch for: Elevated TSH with low T4 suggests hypothyroidism (underactive thyroid) — symptoms include fatigue, weight gain, cold intolerance, brain fog. Low TSH with high T4 suggests hyperthyroidism. Subclinical thyroid issues (borderline numbers with symptoms) are common and frequently missed.

Worth adding: Free T3 and thyroid antibodies (TPO, TgAb) if you have symptoms but normal TSH/T4. Hashimoto's thyroiditis is the most common autoimmune disease and is often caught late.

How often: Annually. More frequently if you have known thyroid issues or are on thyroid medication.

6. Vitamin D (25-hydroxyvitamin D)

What it measures: Your circulating vitamin D level.

What it tells you: Whether you are getting enough vitamin D from sun exposure, food, and supplementation. Vitamin D is involved in immune function, bone health, mood regulation, and hormone production.

What to watch for: Below 30 ng/mL is considered insufficient. Below 20 ng/mL is deficient. Many functional medicine practitioners aim for 40-60 ng/mL. An estimated 42% of American adults are deficient, and the number is higher in northern latitudes, darker-skinned individuals, and people who work indoors.

How often: Twice a year is ideal — once at the end of winter (your lowest point) and once at the end of summer. At minimum, once annually in late winter.

7. High-Sensitivity C-Reactive Protein (hs-CRP)

What it measures: A marker of systemic inflammation.

What it tells you: Whether your body has chronic low-grade inflammation, which is a risk factor for cardiovascular disease, cancer, neurodegeneration, and metabolic dysfunction.

What to watch for: Below 1.0 mg/L is ideal. 1.0-3.0 mg/L is moderate risk. Above 3.0 mg/L is elevated and warrants investigation. Note: acute infections, injuries, or intense exercise can temporarily spike hs-CRP, so test when you are feeling healthy.

How often: Annually. Retest in 4-6 weeks if elevated to confirm it is chronic and not acute.

The "Next Level" Additions

These are not strictly necessary for everyone but are valuable if you are actively optimizing your health or have specific risk factors.

Insulin (Fasting)

Fasting insulin rises years before fasting glucose or HbA1c show a problem. It is one of the earliest markers of insulin resistance. Ideal range is 2-6 uIU/mL. Most standard panels do not include it, but it is inexpensive to add.

ApoB (Apolipoprotein B)

As mentioned above — the best single marker of cardiovascular risk. If you only add one test beyond the basics, make it ApoB.

Homocysteine

Elevated homocysteine is linked to cardiovascular disease and B-vitamin deficiency (B12, folate, B6). Easy to test, easy to correct if elevated.

Ferritin

Measures your iron stores. Low ferritin (even with normal hemoglobin) can cause fatigue, brain fog, and exercise intolerance. High ferritin can indicate iron overload or inflammation. Particularly important for menstruating women (who often run low) and men over 40 (who can accumulate excess iron).

Testosterone (Total and Free)

For men over 35 and women with symptoms of hormonal imbalance. Male testosterone has been declining at the population level for decades. Low testosterone affects energy, mood, body composition, libido, and cognitive function.

How to Get These Tests

Option 1: Ask your doctor. Bring a list. Most primary care physicians will order these tests if you ask, though some may push back on tests they consider unnecessary. Insurance typically covers the core panel during an annual physical.

Option 2: Direct-to-consumer lab testing. Services like Function Health, InsideTracker, and Marek Health let you order comprehensive blood panels without a doctor's order. You visit a local lab (Quest or Labcorp), get drawn, and receive results with analysis through their platform.

The advantage of direct-to-consumer services is comprehensiveness — they test 50-100+ biomarkers in a single draw and provide longitudinal tracking so you can see trends over time. The disadvantage is cost: $500-$1,000+ per year, typically not covered by insurance.

Option 3: Walk-in lab orders. Sites like Ulta Lab Tests and Walk-In Lab let you order individual tests at wholesale prices. You can build your own custom panel for $150-$300. No doctor visit required in most states.

When to Test

Test first thing in the morning after a 12-hour fast. This ensures consistent and comparable results. Avoid intense exercise the day before (it can spike inflammatory markers and liver enzymes). If you are sick, wait until you have been healthy for at least a week.

Key Takeaways

• The essential annual panel: CBC, CMP, lipid panel, HbA1c, thyroid (TSH + Free T4), vitamin D, hs-CRP
• Add if you can: fasting insulin, ApoB, homocysteine, ferritin
• Men over 35: Add total and free testosterone
• Test fasted, first thing in the morning, when healthy
• Track trends over time — a single data point is far less useful than seeing how your markers change year over year
• Do not accept "normal" without seeing the numbers. Lab reference ranges are based on population averages, not optimal health. A fasting glucose of 99 mg/dL is technically "normal" but is one point away from prediabetes.

Your blood tells a story about your health that symptoms alone cannot. The goal is to read that story early enough to change the ending.

This article is for informational purposes only and is not medical advice. Consult your physician before making changes to your health regimen or interpreting lab results.

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