The six essential blood tests every adult needs annually — plus age-specific panels, cost breakdowns, and how to read your results. Take control of your health with proactive screening.
Updated March 29, 2026 • 12-minute read
Most people only get blood work when their doctor orders it — usually because something already feels wrong. But annual blood testing is one of the most powerful (and underutilized) tools for preventive health. It lets you catch problems like prediabetes, thyroid dysfunction, vitamin deficiencies, and cardiovascular risk factors years before symptoms appear.
The challenge? Many people have no idea which tests to ask for, what they cost, or how to make sense of the results. If you have ever wondered "what blood tests should I get annually," this guide gives you a clear, evidence-based answer.
We break down the six tests every adult should include in their yearly panel, additional tests based on your age and risk profile, what each one costs when you order lab tests without a doctor, and how to interpret the numbers on your results.
Why this matters: According to the CDC, 1 in 3 American adults has prediabetes — and 84% of them do not know it. An annual A1C test costs under $30 and can catch it early, when lifestyle changes alone can reverse it.
These six tests form the foundation of preventive blood work. Together, they screen for the most common health issues affecting American adults — and they can all be completed with a single blood draw.
The CBC is the most commonly ordered blood test in the United States, and for good reason. It measures the key components of your blood: red blood cells, white blood cells, hemoglobin, hematocrit, and platelets. Think of it as a broad health snapshot that can reveal problems you would never feel until they become serious.
What it detects: Anemia (low red blood cells or hemoglobin), infections or immune issues (abnormal white blood cells), blood clotting disorders (platelet abnormalities), and certain blood cancers like leukemia. A CBC can also flag nutritional deficiencies — low hemoglobin often points to iron or B12 deficiency.
Why it matters annually: Many forms of anemia develop gradually. You might feel tired for months and attribute it to stress or poor sleep, when the real cause is iron-deficiency anemia that a simple CBC would catch immediately. Similarly, a slowly rising white blood cell count can signal chronic inflammation or an emerging infection long before you develop symptoms.
Typical cost online: $28 - $35
The CMP is a 14-test panel that evaluates your kidneys, liver, electrolytes, and blood sugar. It is arguably the most information-dense test you can order — covering organ function that most people never think about until something goes wrong.
What it measures: Glucose (fasting blood sugar), BUN and creatinine (kidney function), ALT and AST (liver enzymes), albumin and total protein, calcium, sodium, potassium, chloride, CO2, and bilirubin. Each marker tells a different story about how your body is processing nutrients, filtering waste, and maintaining chemical balance.
Why it matters annually: Kidney disease affects 37 million Americans, and most do not know it until they have lost significant function. The CMP catches rising creatinine and BUN levels early. Liver enzymes (ALT/AST) can reveal fatty liver disease — now the most common liver condition in the U.S. — often years before it causes damage. Fasting glucose gives you an early warning for prediabetes and diabetes.
Typical cost online: $29 - $39
Heart disease remains the number one killer in America, and a lipid panel is your primary tool for assessing cardiovascular risk. This test measures four key markers: total cholesterol, LDL ("bad" cholesterol), HDL ("good" cholesterol), and triglycerides.
What each marker means: LDL cholesterol builds up in artery walls and drives atherosclerosis — it is the number your doctor cares about most. HDL cholesterol helps remove LDL from the bloodstream, so higher is better. Triglycerides are a type of fat in your blood that rises with high-sugar diets, excess alcohol, and metabolic syndrome. Total cholesterol is the combined number, though it is less useful on its own.
Why it matters annually: Cholesterol levels can change significantly from year to year based on diet, exercise, weight, and medication use. A person with "normal" cholesterol at 35 can develop dangerously high LDL by 40 if lifestyle changes. Annual tracking lets you spot trends early and make adjustments before you need medication — or confirm that your statin is working if you are already on one.
Typical cost online: $29 - $39
The A1C test measures your average blood sugar over the past 2-3 months. Unlike fasting glucose (which only captures a single moment), A1C gives you the full picture of how your body handles sugar day in and day out. It is the gold standard for diabetes screening and monitoring.
How to read it: An A1C below 5.7% is normal. Between 5.7% and 6.4% is prediabetes. At 6.5% or higher, you meet the diagnostic criteria for type 2 diabetes. Even within the "normal" range, tracking your A1C year over year reveals trends. A reading that climbs from 5.2% to 5.6% over three years signals that your metabolism is heading in the wrong direction — and that is exactly when diet and exercise interventions are most effective.
Why it matters annually: The American Diabetes Association recommends A1C screening for all adults starting at age 35, or earlier if you have risk factors (overweight, family history, sedentary lifestyle). Given that prediabetes is reversible but type 2 diabetes is a lifelong condition, catching it early is one of the highest-value screening decisions you can make.
Typical cost online: $29 - $39
Your thyroid gland controls metabolism, energy, body temperature, heart rate, and mood. When it malfunctions — either overproducing hormones (hyperthyroidism) or underproducing them (hypothyroidism) — the effects touch nearly every system in your body. TSH (thyroid-stimulating hormone) is the primary screening test.
What TSH tells you: High TSH means your pituitary gland is working harder to stimulate a sluggish thyroid (hypothyroidism). Low TSH suggests your thyroid is overactive (hyperthyroidism). The normal reference range is typically 0.4 - 4.0 mIU/L, though many endocrinologists consider anything above 2.5 worth monitoring.
Why it matters annually — especially for women: Women are 5-8 times more likely than men to develop thyroid disorders. By age 60, up to 20% of women have some degree of thyroid dysfunction. Symptoms of hypothyroidism (fatigue, weight gain, brain fog, depression) overlap with so many other conditions that it often goes undiagnosed for years. A simple annual TSH test eliminates the guesswork.
Typical cost online: $29 - $49 (TSH alone vs. full thyroid panel with Free T3/T4)
Vitamin D is not just a vitamin — it functions as a hormone that influences bone health, immune function, mood, and even cardiovascular health. Despite its importance, deficiency is remarkably common: approximately 42% of American adults have insufficient vitamin D levels, with rates even higher among people with darker skin tones, those living in northern states, and adults who spend most of their time indoors.
Optimal vs. deficient: Levels below 20 ng/mL are considered deficient. Between 20 and 30 ng/mL is insufficient. Most experts recommend maintaining levels between 40 and 60 ng/mL for optimal health. If your level is low, supplementation is straightforward and inexpensive — but you need to know your number first to determine the right dose.
Why it matters annually: Vitamin D levels fluctuate with the seasons, lifestyle changes, and age (your skin becomes less efficient at producing vitamin D as you get older). Annual testing — ideally in late winter when levels are lowest — helps you calibrate your supplementation strategy rather than guessing.
Typical cost online: $39 - $59
Order your annual panel online — no doctor visit required.
RequestATest lets you choose your own tests, visit a local Quest or Labcorp location, and get results in 1-3 business days.
Browse Tests at RequestATestCLIA-certified labs • Results in 1-3 days • No insurance needed
Beyond the core six, certain tests become important based on your age, sex, and individual risk factors. Here is what to consider adding to your annual panel.
Testosterone (Total and Free): Testosterone declines roughly 1% per year after age 30. By 40, many men notice changes in energy, body composition, libido, and mood. Testing establishes a baseline and helps distinguish normal aging from clinically low testosterone, which affects an estimated 20-40% of men over 45.
PSA (Prostate-Specific Antigen): The American Cancer Society recommends discussing PSA screening with your doctor starting at age 50 (or 40-45 for higher-risk men). Annual tracking of PSA trends is more useful than any single reading.
Full Thyroid Panel (TSH, Free T3, Free T4, TPO Antibodies): While TSH alone is a good screening tool, women experiencing fatigue, hair loss, or weight changes benefit from the full panel. TPO antibodies can detect Hashimoto's thyroiditis — the most common autoimmune disease — years before TSH becomes abnormal.
Iron and Ferritin: Menstruating women are at significantly higher risk of iron deficiency. Ferritin (stored iron) drops long before hemoglobin does, making it an earlier indicator than the CBC alone. Estrogen (Estradiol): Becomes particularly important during perimenopause (typically starting in the early-to-mid 40s) to guide treatment decisions.
C-Reactive Protein (CRP): CRP is a marker of systemic inflammation, which drives cardiovascular disease, autoimmune conditions, and even cancer. High-sensitivity CRP (hs-CRP) is now used alongside cholesterol to assess heart attack and stroke risk. A reading above 3.0 mg/L signals elevated cardiovascular risk.
Homocysteine: Elevated homocysteine is linked to heart disease and cognitive decline. It is easily treated with B vitamins if caught early. Vitamin B12: Absorption decreases with age, and deficiency causes neurological symptoms that mimic dementia.
Annual STD Panel: The CDC recommends at least annual screening for sexually active adults. A standard panel includes HIV, syphilis, gonorrhea, chlamydia, and hepatitis B/C. Many STDs are asymptomatic — you can carry and transmit them without knowing.
Adding an STD panel to your annual blood work normalizes routine screening and eliminates the stigma of requesting individual tests. Read our complete STD testing guide for details on what to test and how often.
One of the biggest barriers to annual testing is cost — especially for uninsured or underinsured Americans. Ordering through an online service like RequestATest eliminates the office visit fee and typically costs 50-85% less than hospital pricing.
| Test | Doctor's Office / Hospital | Online (RequestATest) | Savings |
|---|---|---|---|
| Complete Blood Count (CBC) | $50 - $150 | $28 - $35 | 44 - 77% |
| Comprehensive Metabolic Panel (CMP) | $50 - $200 | $29 - $39 | 42 - 81% |
| Lipid Panel | $50 - $200 | $29 - $39 | 42 - 81% |
| Hemoglobin A1C | $50 - $150 | $29 - $39 | 42 - 74% |
| TSH (Thyroid) | $40 - $150 | $29 - $49 | 28 - 67% |
| Vitamin D, 25-Hydroxy | $50 - $250 | $39 - $59 | 22 - 76% |
| Full Annual Panel (All 6) | $290 - $1,100+ | $150 - $250 | 48 - 77% |
Note: Doctor's office pricing includes the cost of an office visit ($100-$300) plus lab fees. Hospital outpatient lab pricing can be significantly higher. Online pricing is based on publicly listed rates from RequestATest as of March 2026. Prices vary by location and may change.
The savings become even more dramatic when you add age-specific tests. A comprehensive panel for a man over 40 — including testosterone and PSA — might run $800-$1,500 through traditional channels. Online, the same battery of tests typically costs $250-$400. For a deeper dive into the numbers, see our guide to lab test costs without insurance.
Lab results come with reference ranges, but knowing what is "normal" and what is "optimal" are two different things. Here is a quick reference for the most important markers in your annual panel.
| Marker | Normal Range | Optimal Range | Red Flag |
|---|---|---|---|
| Fasting Glucose | 70 - 99 mg/dL | 75 - 90 mg/dL | Above 100 (prediabetes zone) |
| Hemoglobin A1C | Below 5.7% | Below 5.4% | 5.7%+ (prediabetes) / 6.5%+ (diabetes) |
| LDL Cholesterol | Below 130 mg/dL | Below 100 mg/dL | Above 160 (high risk) |
| HDL Cholesterol | 40+ mg/dL (men), 50+ (women) | 60+ mg/dL | Below 40 (increased cardiac risk) |
| Triglycerides | Below 150 mg/dL | Below 100 mg/dL | Above 200 (high) |
| TSH | 0.4 - 4.0 mIU/L | 1.0 - 2.5 mIU/L | Above 4.0 (hypothyroid) / Below 0.4 (hyper) |
| Vitamin D | 30 - 100 ng/mL | 40 - 60 ng/mL | Below 20 (deficient) |
| ALT (Liver) | 7 - 56 U/L | Below 30 U/L | Above 56 (liver stress) |
| Creatinine (Kidney) | 0.7 - 1.3 mg/dL (men) | 0.8 - 1.1 mg/dL | Above 1.3 (impaired kidney function) |
Important: Reference ranges vary slightly between labs. Always compare your results to the specific ranges printed on your lab report. A value flagged as "high" or "low" on one lab's report may be within range at another. When in doubt, consult your doctor — especially if multiple markers are outside the optimal range.
One of the most valuable practices is tracking your results over time rather than looking at any single reading in isolation. A fasting glucose of 95 mg/dL is technically "normal," but if it was 82 two years ago and 89 last year, you are trending toward prediabetes and should take action now. Many online lab services, including RequestATest, allow you to compare current and past results easily.
Annual testing is the minimum for healthy adults, but certain situations call for more frequent monitoring.
The core six-test panel should be done at least once per year for all adults over 18. Think of it like an annual physical — except blood tests give you objective data, not just a stethoscope check. Schedule it at the same time each year (many people pair it with their birthday month) so it becomes a habit.
If you have borderline results in any category — A1C between 5.5% and 5.7%, rising LDL, or TSH trending toward the edges of normal — testing every six months lets you catch changes faster and evaluate whether lifestyle modifications are working.
People actively managing diagnosed conditions like type 2 diabetes, thyroid disorders, or high cholesterol on medication should test quarterly. A1C by definition measures a 2-3 month average, so quarterly testing gives you a rolling picture of blood sugar control.
Starting a new medication, supplement, or major lifestyle change? Test before you begin and again 8-12 weeks later. This creates a clear before-and-after comparison so you (and your doctor) can see whether the intervention is working. This applies to statins, thyroid medication, testosterone therapy, high-dose vitamin D, and significant dietary changes.
The beauty of ordering your own lab tests online is that you are not limited by insurance approval or appointment availability. If you want to retest your lipid panel three months after changing your diet, you can order it yourself for under $40 and have results within days. Learn more about the process in our guide to ordering lab tests without a doctor.
If you do not have a primary care doctor, your insurance does not cover preventive blood work, or you simply want more control over your own health data, ordering lab tests online is a straightforward and increasingly popular option.
How the process works:
We have evaluated several direct-to-consumer lab testing services, and RequestATest consistently stands out for its transparent pricing, wide test selection (over 100 individual tests and panels), and use of CLIA-certified labs. They offer both Quest and Labcorp locations, and you can often find bundled annual panels that save additional money compared to ordering tests individually.
For our full evaluation, including pricing comparisons, user experience, and turnaround times, read our in-depth RequestATest review.
Tip: Look for annual wellness panels or comprehensive health panels that bundle the core tests together. These bundles typically cost 15-25% less than ordering each test separately, and they are designed to cover the essentials in a single blood draw.
At minimum, every adult should get a Complete Blood Count (CBC), Comprehensive Metabolic Panel (CMP), Lipid Panel, Hemoglobin A1C, TSH (thyroid), and Vitamin D test annually. These six tests screen for the most common and impactful health conditions — including heart disease, diabetes, thyroid disorders, kidney and liver problems, anemia, and nutritional deficiencies. Additional tests based on age and risk factors (testosterone, PSA, iron, CRP) should be considered as you get older.
Yes. In most U.S. states, you can order your own blood tests through online services like RequestATest without a doctor's order. You select your tests online, visit a local Quest Diagnostics or Labcorp patient service center, and receive your results digitally — often within 1-3 business days. The exceptions are a handful of states (New York, New Jersey, Rhode Island, and Maryland) that restrict or limit direct-to-consumer lab testing. For the full process, see our guide to ordering lab tests without a doctor.
A comprehensive annual panel including CBC, CMP, lipid panel, A1C, TSH, and vitamin D typically costs between $150 and $250 through online lab services — compared to $500-$1,500+ through a doctor's office or hospital outpatient lab when you factor in the office visit fee. Bundled wellness panels often offer the best value. See our complete cost breakdown for test-by-test pricing.
For most annual panels, a 10-12 hour fast is recommended — especially for accurate lipid panel and fasting glucose results within the CMP. Drinking water during the fast is fine and actually recommended (it keeps your veins hydrated for an easier blood draw). Coffee, juice, and other beverages should be avoided. Schedule your appointment first thing in the morning to make fasting as easy as possible — most people simply skip breakfast and go to the lab right after waking up.
Healthy adults should get a comprehensive panel at least once per year. If you are managing a condition like diabetes, thyroid disorder, or high cholesterol, your doctor may recommend testing every 3-6 months to monitor treatment effectiveness and adjust medications. People with borderline results should consider testing every six months to track trends. Quarterly testing is appropriate for anyone actively adjusting medication doses or making significant lifestyle interventions.
Order your own blood tests online, skip the waiting room, and get results in days. Preventive testing is one of the smartest investments you can make in your long-term health.
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