Which blood tests do adults actually need? A guideline-based checklist
The blood tests with the strongest guideline support depend on your age and risk. The U.S. Preventive Services Task Force (USPSTF) backs a lipid panel to guide statin decisions from 40 to 75, an A1c or fasting glucose test for adults 35 to 70 with overweight or obesity, a one-time hepatitis C test from 18 to 79, and HIV testing from 15 to 65, alongside regular blood pressure checks. A CBC, comprehensive metabolic panel (CMP) and TSH are common baseline labs rather than formal screening recommendations, and routine vitamin D screening in adults without symptoms has not earned a recommendation either way.
That is the short answer. The longer answer is where most people get lost, because a lab menu with 90 biomarkers and a guideline with five tests are answering different questions. One asks "what should every adult be screened for?" The other asks "what is happening inside my body right now?" Both are useful. You just need to know which is which.
The guideline-backed checklist
These are the tests with a formal USPSTF recommendation for adults without symptoms. Blood pressure is not a blood test, but it belongs on the list because it sits at the center of cardiovascular risk alongside your lipids and glucose. You can browse each recommendation on the USPSTF recommendation topics page, and MedlinePlus Health Screening summarizes the same screenings in plain language.
| Test | Who it applies to | Guideline basis | What it tells you |
|---|---|---|---|
| Blood pressure | Adults 18 and older | USPSTF hypertension screening | Whether you have high blood pressure, a major driver of heart attack and stroke |
| Lipid panel | Adults 40 to 75, as part of cardiovascular risk estimation | USPSTF statin use for primary prevention (2022) | LDL, HDL, triglycerides and total cholesterol, which feed your 10-year risk estimate |
| A1c or fasting glucose | Adults 35 to 70 with overweight or obesity | USPSTF prediabetes and type 2 diabetes screening (2021) | Whether your blood sugar is normal, in the prediabetes range, or diabetic |
| Hepatitis C antibody | Adults 18 to 79 | USPSTF hepatitis C screening | Past or current hepatitis C infection, which is treatable |
| HIV | Ages 15 to 65, and anyone at increased risk | USPSTF HIV screening | Whether you have HIV, so treatment can start early |
A few details matter here. The 2021 diabetes recommendation allows fasting plasma glucose, HbA1c or an oral glucose tolerance test. The 2022 statin recommendation says adults 40 to 75 with at least one risk factor (such as high cholesterol, diabetes, high blood pressure or smoking) and an estimated 10-year cardiovascular risk of 10% or higher should be offered a statin, while those at 7.5% to under 10% should make an individual decision with their clinician. Your lipid panel is what makes that calculation possible. If your numbers have ever confused you, our guide to the truth behind your cholesterol numbers walks through each value.
Common baseline labs that are not formal screening recommendations
Three tests show up on almost every annual physical, yet none has a USPSTF recommendation for routine screening of healthy adults. That does not make them useless. It means they are clinical judgment calls: cheap, broad snapshots that help a clinician establish your baseline and spot problems early.
| Test | What it measures | Why clinicians order it |
|---|---|---|
| CBC (complete blood count) | Red cells, white cells, hemoglobin, hematocrit, platelets | Screens for anemia, infection, and blood disorders; monitors some medications |
| CMP (comprehensive metabolic panel) | 14 substances: glucose, calcium, sodium, potassium, carbon dioxide, chloride, albumin, total protein, ALP, ALT, AST, bilirubin, BUN, creatinine | Checks kidney and liver function, electrolytes and blood sugar in one draw |
| TSH (thyroid stimulating hormone) | The pituitary signal that drives thyroid output | Looks for an underactive or overactive thyroid, especially with fatigue, weight change or cold intolerance |
MedlinePlus describes the CMP as a measure of your body's chemical balance and metabolism, and notes it is often part of a routine checkup. Because it includes glucose, a CMP can flag high blood sugar, though A1c gives a better picture of your average over roughly the past few months.
The honest framing: these labs are reasonable to have on file, especially if you take medications, have symptoms, or want a baseline to compare against later. They are not evidence that every adult must be tested every year.
Vitamin D: why routine screening is an open question
Vitamin D is one of the most requested tests, and it is the clearest example of the gap between popularity and evidence. In 2021 the USPSTF issued an "I statement" for screening asymptomatic, community-dwelling, nonpregnant adults. An I statement means the evidence is insufficient to judge whether the benefits outweigh the harms. It is not a recommendation against testing; it is a statement that studies have not settled the question.
Testing is still reasonable when there is a specific reason. MedlinePlus explains that the 25-hydroxy vitamin D test is used for people at risk of deficiency, including those with little sun exposure, darker skin, older age, obesity, weight-loss surgery, conditions that affect fat absorption such as Crohn's or celiac disease, and bone problems like osteoporosis. If any of those apply to you, a vitamin D level gives your clinician something concrete to act on.
How often to repeat each test
Intervals are where guidelines get thin. Some recommendations specify timing; many leave it to clinical judgment. Here is what the evidence supports, stated as plainly as it allows.
| Test | Typical repeat interval | Basis |
|---|---|---|
| Blood pressure | At regular visits, more often from age 40 or with risk factors | USPSTF hypertension screening |
| A1c or fasting glucose | Every 3 years may be reasonable after a normal result; sooner if borderline | USPSTF 2021, which notes the evidence on intervals is limited |
| Lipid panel | No fixed USPSTF interval; repeated to update your risk estimate, more often if borderline or on treatment | Clinician judgment |
| Hepatitis C | Once for most adults; repeat if risk continues | USPSTF hepatitis C screening |
| HIV | At least once; periodically with ongoing risk | USPSTF HIV screening |
| CBC, CMP, TSH | No guideline interval; set by symptoms, medications and prior results | Clinician judgment |
| Vitamin D | Only when there is a clinical reason or to recheck after treatment | MedlinePlus; USPSTF I statement |
If you take medication that affects your labs, your monitoring schedule will be tighter than anything in this table. That is normal, and it is the point of monitoring.
Risk factors that change your list
The checklist above is the floor, not the ceiling. Several things move tests onto your list earlier or more often:
- Family history. A parent or sibling with early heart disease or very high cholesterol may justify lipid testing well before 40. The USPSTF diabetes recommendation also notes that clinicians should consider earlier screening for people with a family history of diabetes, a history of gestational diabetes or polycystic ovary syndrome, and members of groups with higher diabetes rates.
- Medications. Many common drugs call for routine labs. Some blood pressure medications affect potassium and kidney markers on a CMP, and hormone therapies such as testosterone require ongoing blood count and hormone monitoring.
- Pregnancy. Pregnancy brings its own screening schedule, including tests for infections and gestational diabetes, managed by your obstetric clinician.
- Symptoms. Any of these tests stops being "screening" the moment you have symptoms. Persistent fatigue, unexplained weight change, excessive thirst or shortness of breath deserve evaluation by a clinician, not a wait for your next scheduled panel.
Reference ranges vs optimal ranges
Every lab report shows a reference range next to your number. That range is built from results in a population of people considered healthy, which means two things. First, some healthy people will land slightly outside it on any given test. Second, a result just inside the range is not automatically ideal.
Out of range is not the same as disease. A slightly high ALT after a hard workout, a borderline glucose after a poor night's sleep, or a low white count in someone who has always run low may mean nothing at all. Context, trends and repeat testing matter more than any single flagged value.
You will also see "optimal ranges" marketed by longevity clinics and testing brands. Be clear about what they are: narrower targets that some clinicians use to spot drift before it becomes disease. They can be useful for tracking trends over time, but they are not standardized, and they vary from lab to lab and clinic to clinic. A number outside someone's optimal range is a prompt for a conversation, not a diagnosis.
Going beyond the minimum with BioCure
A decade ago, most people only did blood work when something felt wrong. Today, many adults want a fuller picture: hormones, thyroid, metabolic health and organ function, tracked over time. That is a different goal from guideline screening, and it is a legitimate one, as long as the results are interpreted by someone who knows what they mean.
At BioCure Health, our diagnostics program starts with Comprehensive Male and Female panels covering hormones, thyroid, lipids, metabolic and organ markers. You can have a test kit delivered and a phlebotomist come to your home, or test in a lab. Results arrive within 7 to 14 days, and every result is reviewed with a specialist in a one-on-one consultation. BioCure is physician-led, licensed in 47 states, and does not bill insurance directly, though many patients use HSA or FSA funds with the documentation we provide.
Where BioCure fits best: you want a broad baseline, a clear explanation, and a plan. Where your primary care clinician fits best: routine infectious disease screening like HIV and hepatitis C, plus age-based cancer screening. The two work well together. If you want a structured way to start, our year-end health audit lays out how to plan a full review.
Frequently asked questions
What blood tests should I get every year?
No guideline requires a fixed annual panel for every healthy adult. The tests with formal USPSTF support are a lipid panel for cardiovascular risk from 40 to 75, A1c or fasting glucose for adults 35 to 70 with overweight or obesity, and one-time hepatitis C and HIV tests. Many clinicians add a CBC, CMP and TSH as a baseline, with the schedule set by your age, medications and results.
Is A1c or fasting glucose better for diabetes screening?
The USPSTF 2021 recommendation accepts fasting plasma glucose, HbA1c or an oral glucose tolerance test. A1c reflects your average blood sugar over the past few months and does not require fasting, which makes it convenient. Fasting glucose captures a single moment, so clinicians sometimes use both to confirm a result.
Should I get my vitamin D level checked?
If you have no symptoms and no risk factors, the USPSTF says the evidence is insufficient to recommend routine screening either way. Testing makes sense if you have risk factors such as little sun exposure, darker skin, obesity, weight-loss surgery, a condition affecting fat absorption, or osteoporosis. Your clinician can decide whether a result would change what you do.
What does a comprehensive metabolic panel test for?
A CMP measures 14 substances in one blood draw, including glucose, calcium, electrolytes, kidney markers (BUN and creatinine) and liver markers (ALT, AST, ALP, bilirubin, albumin and total protein). It gives a broad view of kidney function, liver function, fluid balance and blood sugar. It is commonly ordered at routine checkups and to monitor certain medications.
Does an out-of-range lab result mean something is wrong?
Not necessarily. Reference ranges are based on healthy populations, so some healthy people fall slightly outside them, and results can shift with exercise, sleep, hydration or recent meals. A clinician looks at the pattern, your history and repeat results before deciding whether a flagged value matters.
Can I do comprehensive blood work at home?
Yes. BioCure Health can deliver a test kit and send a phlebotomist to your home, or you can test in a lab. Results arrive within 7 to 14 days and are reviewed with a specialist so you understand what each marker means for you.
Longevity is not accidental, it is intentional. Start with the tests the evidence supports, add the ones your history calls for, and make sure someone qualified helps you read the results. When you are ready, reach out to our team and we will help you build a panel that fits your goals.
Let BioCure Health lead you in the right direction. Call or text us to schedule an introductory call at 754-206-0838, your future self will thank you.