What Blood Tests Should I Get

There is no single blood-test list that every adult needs. Useful tests depend on why you are testing, your age, health and family history, symptoms, medications, prior results, and what you would do with the result.

Before ordering, identify the question the test should answer, check its preparation instructions, and decide who will interpret and follow up on the result.

This article provides general education and does not provide medical advice, choose tests for an individual, diagnose a condition, or replace care from a qualified healthcare professional. Seek urgent medical care for severe or rapidly worsening symptoms rather than waiting for an online test.

Start with the reason for testing

A useful test starts with a defined purpose. The same marker can be reasonable in one situation and unhelpful in another.

Blood work commonly serves one of four purposes:

Preventive screening: Looking for a condition or risk factor before symptoms appear.
Symptom evaluation: Helping a clinician investigate a specific concern.
Monitoring: Following a diagnosed condition, medication, or treatment plan.
Trend tracking: Comparing a selected marker over time when there is a clear reason to follow it.

HHS MyHealthfinder explains that appropriate screening depends on factors such as age, sex, and medical history. It also notes that screening can produce false positive results, which may lead to stress and additional testing.

That tradeoff matters. With a large group of unrelated markers, any value outside its reference range still needs context. The flag may be important, harmless, temporary, or affected by preparation. The number alone cannot tell you which explanation fits.

Common blood tests and the questions they can support

The table below is a map of common test categories. It is not a checklist for every adult.

Test or category	What it measures at a high level	Question it may help address
Complete blood count (CBC)	Red blood cells, white blood cells, platelets, hemoglobin, and related indices	Are blood-cell measurements contributing useful information to a routine review, symptom evaluation, or monitoring plan?
Basic metabolic panel	Glucose, calcium, electrolytes, and kidney-related markers	Would a group of metabolic and kidney-related measurements help answer the current question?
Lipid panel	Total cholesterol, LDL cholesterol, HDL cholesterol, and triglycerides	Is cardiovascular risk or lipid monitoring the reason for testing?
A1C test or glucose testing	Glucose attached to hemoglobin over time or glucose at a specific point	Is the goal screening, diagnosis support, or monitoring related to blood sugar?
TSH test	Thyroid-stimulating hormone	Does the history, symptom pattern, or monitoring plan call for a thyroid-focused starting point?
Iron, TIBC, and ferritin panel	Several markers related to iron transport and storage	Is there a specific reason to investigate or monitor iron status?
Vitamin D test or another nutrient test	The selected nutrient marker	Is there a documented risk, prior result, symptom evaluation, diet issue, or monitoring need?
Free and total testosterone test or another hormone test	The selected hormone measurements	Is there a defined reason for ordering the marker and a plan to interpret the result in context?

The National Heart, Lung, and Blood Institute describes CBCs, metabolic panels, lipid panels, and other blood tests as tools that help clinicians check body functions, investigate conditions, and monitor treatment. The result supports a larger assessment. It does not replace one.

CBC and metabolic panels

A CBC measures blood cells and related values. It can add useful information in a routine checkup, symptom evaluation, or monitoring plan. A CBC does not identify the cause of every abnormal count by itself.

Metabolic panels group several blood-chemistry measurements. A BMP includes markers related to glucose, calcium, electrolytes, and kidney function. A CMP includes additional proteins and liver-related measurements. The broader panel is useful only when those added measurements fit the testing question.

Lipids and blood-sugar markers

A lipid panel measures several fats in the blood and can inform a cardiovascular risk discussion. MedlinePlus describes A1C as a measurement of glucose attached to hemoglobin. A blood glucose test measures glucose at a particular time. These tests answer different questions, so they should not be treated as interchangeable.

Risk factors, prior results, pregnancy, medicines, and known conditions can change which test and schedule make sense. A qualified healthcare professional can connect those details to current screening or monitoring guidance.

Thyroid, iron, nutrient, and hormone tests

Targeted tests can be useful when a history, symptom pattern, medicine, prior result, or diagnosed condition creates a specific question. MedlinePlus explains that TSH testing checks thyroid-stimulating hormone, while a ferritin blood test checks a protein that stores iron. Each result addresses a narrower question than a general request to check everything.

Fatigue shows why context matters. A person may wonder about iron, thyroid, vitamin, hormone, sleep, medication, or other causes. One self-selected marker cannot sort through every possibility. Testing without a clear plan may leave the original question unanswered.

How to narrow the list for your situation

Routine preventive screening

Preventive screening looks for health problems before symptoms appear. The right screening plan depends on personal factors and current recommendations, rather than a fixed annual bundle.

Start with:

Your age and relevant health history.
Conditions that run in your family.
Prior results and trends.
Medicines or treatments that need monitoring.
Pregnancy status or plans when relevant.
Screening recommendations that apply to your risks.

The goal is to choose tests with a reasonable chance of changing a decision. If a result would not alter follow-up, it may add cost and uncertainty without adding much value.

New or unexplained symptoms

Symptoms change the task from general screening to evaluation. A long list assembled from symptom searches can miss the most likely cause and create unrelated abnormal flags.

Write down when the symptom began, what makes it better or worse, other symptoms, current medicines and supplements, and any recent illness or major change. That history helps a clinician select tests that fit the full pattern.

Severe, sudden, or rapidly worsening symptoms need timely medical assessment. An online test should not delay urgent care.

Monitoring a condition or medication

Monitoring works best when each test has a defined relationship to the condition or treatment. The ordering clinician may specify the marker, timing, target, and response to a change.

Do not replace that plan with a different panel because it appears broader. A substituted test may measure something else, use a different method, or miss the timing needed for a safe treatment decision.

Fitness, performance, and trend tracking

Athletes and health-focused consumers often want baseline data. A useful baseline still needs a question. Examples include following a previously abnormal value or reviewing a marker connected to a clinician-guided nutrition or training concern.

Food, medicines, supplements, hard exercise, a menstrual period, and missed preparation instructions can affect some results. Record relevant conditions around each draw and follow the test instructions. For trends, MedlinePlus advises that different laboratories may use different methods and reference ranges. Using the same laboratory can make comparisons easier to interpret.

Should you choose an individual test or a panel?

An individual test makes sense when one marker directly addresses the question. A panel makes sense when its grouped markers belong to the same clinical or monitoring question.

For example, several lipid measurements can be read together in a cardiovascular risk discussion. A metabolic panel groups related chemistry measurements. In each case, the panel has a defined structure.

A large bundle of unrelated tests creates a different problem. Each marker has its own reference range and preparation considerations. More results do not guarantee a clearer answer.

Before choosing a panel, ask:

Which markers are included?
Why is each marker relevant to the goal?
Could recent exercise, food, medicines, or supplements affect any of them?
Who will review an unexpected result?
Would an abnormal value need repeat or confirmatory testing?

Choose the smallest set that can answer the current question and support an appropriate next step.

Questions to answer before ordering blood work

Use this checklist before buying a test or booking a blood draw.

What question should the result answer? Write one sentence. “Check my health” is too broad to guide a useful choice.
Is the goal screening, symptom evaluation, monitoring, or trend tracking? Each purpose can lead to a different test and follow-up plan.
What would I do with a normal, abnormal, or unclear result? Know who can help interpret it and whether repeat testing may be needed.
What preparation does this exact test require? Confirm fasting, timing, hydration, exercise, and other instructions for the selected test.
Which medicines and supplements could matter? Do not stop them on your own. Record what you take and ask a qualified professional about preparation.
Is the test available to me? Direct-access rules, ordering requirements, and collection options can vary by state and service.
How will urgent or critical results be handled? Confirm the service’s current process before ordering.
Can I compare this result with my prior result? Check the laboratory, method, units, and reference range before treating two numbers as a clean trend.

If you cannot answer the first three questions, pause before ordering. The follow-up plan is part of the test decision.

How direct-access blood testing works

Direct-access testing allows a consumer to initiate laboratory testing. The exact process varies. State law may affect whether direct-access testing is permitted and who may order or receive results. The service’s current workflow determines its authorization, collection, and result-delivery process within those rules.

A typical process may include these stages:

Select a test that fits a defined question.
Confirm state eligibility, authorization, price, specimen, and collection instructions.
Follow the test-specific preparation requirements.
Complete sample collection at the listed location or by the approved method.
Receive the laboratory report through the service’s stated process.
Review the result with a qualified healthcare professional when it could affect a medical decision.

The Centers for Medicare & Medicaid Services notes that direct-access rules vary by state and that laboratories performing this testing remain subject to applicable CLIA requirements. Confirm the current terms for the exact service and your location.

How to read a result without overreacting

A lab report usually compares a result with a reference range. That range comes from the reporting laboratory and may differ from a range used elsewhere.

MedlinePlus explains two points that prevent common mistakes:

A result outside the reference range may or may not indicate a health problem.
A result inside the range does not guarantee that no health problem exists.

Interpretation may depend on symptoms, history, prior values, medicines, supplements, preparation, and other test results. Hard exercise, food and drink, a menstrual period, or missed preparation instructions can affect some measurements.

False positive and false negative results are also possible. A clinician may recommend repeating a test, using another method, or reviewing related information before drawing a conclusion.

Do not start, stop, or change a medicine, hormone, diet, or supplement based only on one result or an online article. The FDA’s consumer-testing guidance says test results should not be the sole basis for medical decisions and that consumer tests do not replace recommended screening or clinical follow-up.

Frequently asked questions

Do I need a CBC and metabolic panel every year?

There is no universal annual blood-work schedule for every adult. A clinician may use a CBC or metabolic panel during a routine review, for symptoms, or for monitoring. Your history, risks, medicines, prior results, and current guidance should shape the decision.

Can I order my own blood tests?

Direct-access testing is available in many situations, though state rules and service workflows differ. Confirm eligibility, authorization, collection, and result-review details for your location and selected test.

Do I need to fast before blood work?

Some tests require fasting and others do not. The requirements can also depend on the ordered panel and the laboratory’s instructions. Follow the directions for the exact test. Do not assume that a rule from a prior blood draw applies to a new one.

Is a larger panel better?

A larger panel is useful when its included markers answer a coherent question. An unrelated bundle can add results that need interpretation without resolving the issue that prompted testing.

What should I do with an abnormal result?

Read the reporting laboratory’s reference range and instructions, then contact a qualified healthcare professional who can review the result in context. Do not diagnose yourself from the flag alone. Seek urgent medical care for severe or rapidly worsening symptoms rather than waiting for an online follow-up.

Choose the next test with a follow-up plan

Write down your testing goal, relevant history, medicines and supplements, recent symptoms, and prior results. Then compare that question with the markers included in the test you are considering.

You can review Vanguard Performance Labs’ available tests and panels to see the current options. Read the exact product page and follow the instructions supplied during ordering. If preparation or availability details are not provided, do not assume that another test’s instructions apply.

Bring the report to a qualified healthcare professional when the result could affect screening, diagnosis, treatment, or medication decisions. A useful blood test produces a result you can interpret and act on responsibly.

What Blood Tests Should I Get?