What are the 10 most common blood tests?

The tests you are most likely to see are the CBC, the basic or comprehensive metabolic panel, the lipid panel, TSH, hemoglobin A1c, vitamin D, iron studies (especially ferritin), vitamin B12, folate, and CRP or hs-CRP. Together they cover blood cells, organ function, heart risk, blood sugar and key nutrients.

What are the 5 main tests for a full-body checkup?

A solid core is a CBC, a CMP, a lipid panel, TSH and hemoglobin A1c. Your doctor may add vitamin D, ferritin or B12 depending on your age, diet and symptoms.

What is MCV, MCH, MCHC, and RDW-CV?

They describe your red blood cells. MCV is their average size, MCH is how much hemoglobin each one holds, and MCHC is how concentrated that hemoglobin is. RDW-CV shows how much the cells vary in size, expressed as a percentage. Together they help pinpoint the type and cause of anemia.

What are the most important results in a blood test?

It depends on why the test was done, but hemoglobin, white cell count, platelets, glucose or A1c, creatinine and eGFR, potassium, and liver enzymes are the ones doctors usually check first. Any result marked as "critical" by the lab should be discussed with your doctor right away.

What is TC, DC, ESR, and Hb blood tests?

These short forms are especially common on reports in South Asia. TC is the total count of white blood cells. DC is the differential count, which splits white cells into their five types. ESR is the erythrocyte sedimentation rate, a general sign of inflammation. Hb is hemoglobin. Together they form a basic blood picture.

What is a good blood result?

A good result is one that fits you, not just the range. It sits within or near the reference range, is stable compared with your earlier results, and makes sense given how you feel. A value slightly outside the range with no symptoms and no change over time is often nothing to worry about, but always check it with your doctor.

Blood Test Results Explained: CBC, CMP, Lipids and More

Got your blood tests result but not sure what they mean? You are not alone. Lab reports are full of short forms, numbers, and ranges that can feel confusing at first.

This guide makes it simple. We explain what blood tests check, how to read each line of your report, and what the most common tests mean, like the CBC, metabolic panel, cholesterol, thyroid, and iron. We also explain why a result outside the range is not always a problem, and why comparing your results over time gives you the clearest picture of your health.

What are blood tests?

A blood test is a small sample of blood, usually drawn from a vein in your arm, that a lab checks for cells, chemicals, proteins and hormones. The results give your doctor a snapshot of how your organs are working, whether you have enough of certain nutrients, and whether something like an infection or inflammation is going on.

That snapshot is useful, but it is easy to misread. A report can run to three pages, packed with abbreviations and little red flags. This guide walks through the markers you are most likely to see, what each one means in plain words, and why a single number rarely tells the whole story.

What do blood tests show?

Blood reaches every organ in your body, so it carries clues about all of them. Broadly, blood tests can show:

How well your kidneys and liver are filtering and processing waste
Whether you have enough red blood cells to carry oxygen
How your immune system is behaving
How your body handles sugar and fat
Hormone levels, such as thyroid hormones
Signs of inflammation, clotting problems or, in some cases, cancer

Blood tests rarely diagnose a condition on their own. They point your doctor toward the right questions, and they help track whether a treatment is working.

What a "standard panel" is

A panel is a group of tests run on the same sample because together they tell a connected story. When people say they had "routine bloodwork," they usually mean some mix of the tests below.

The tests most doctors order together

Complete blood count (CBC): your red cells, white cells and platelets
Comprehensive metabolic panel (CMP): blood sugar, kidney and liver markers, electrolytes and proteins
Lipid panel: cholesterol and triglycerides
Thyroid tests: usually TSH first
Hemoglobin A1c: your average blood sugar over the past few months

Depending on your age, symptoms and history, your doctor may add vitamin D, iron studies or an inflammation marker such as hs-CRP.

How to read one line of your report

Every line on a lab report follows the same pattern. Once you know the four key parts, the whole report gets easier.

Part	What it means	Example
Value	Your measured result	11.4
Unit	How it was measured	g/dL
Range	The span the lab considers typical	12.0–15.5
Flag	A marker when you fall outside the range	L (low) or H (high)

So a line reading "Hemoglobin 11.4 g/dL (12.0–15.5) L" means your hemoglobin was 11.4 grams per deciliter, the lab's usual range is 12.0 to 15.5, and you came in a little low.

Pay attention to units. Labs in different countries use different ones. Glucose, for example, is reported in mg/dL in the US and mmol/L in much of the world. A value that looks alarming might simply be in a unit you are not used to.

Why the reference range is not the same as your normal

A reference range is built by testing a large group of healthy people and taking the middle 95% of their results. That means about 1 in 20 healthy people will land outside the range on any single test, purely by chance. Run 20 tests and there is a fair chance at least one comes back flagged, even if you feel perfectly well.

The reverse is also true. Your personal normal may sit near the bottom of a range. If your result suddenly jumps to the top of it, nothing gets flagged, but for you it could be a real change. Ranges also differ from lab to lab, so always read your result against the range printed on your own report.

Complete Blood Count (CBC)

The CBC counts and measures the cells floating in your blood. It is the single most common blood test, and it is often the first one ordered when you feel tired, run a fever or just go in for a checkup. The ranges below are typical adult values; your lab's may differ slightly.

White blood cells (WBC) and the differential

White blood cells are your immune system's front line. A typical adult range is about 4,500 to 11,000 cells per microliter. A high count often points to an infection, inflammation or stress on the body. A low count can follow a viral illness, certain medicines or, less often, a bone marrow problem.

The differential breaks the total into five types: neutrophils (fight bacteria), lymphocytes (fight viruses and make antibodies), monocytes (clean up debris), eosinophils (allergies and parasites) and basophils (allergic reactions). The mix often says more than the total. High neutrophils lean toward a bacterial infection, while high eosinophils lean toward allergies.

Red blood cells (RBC)

Red blood cells carry oxygen from your lungs to the rest of your body. The RBC count is usually around 4.7 to 6.1 million per microliter in men and 4.2 to 5.4 million in women. Low counts suggest anemia. High counts can come from dehydration, smoking, living at altitude or a condition that makes the body overproduce red cells.

Hemoglobin

Hemoglobin is the iron-rich protein inside red cells that actually grabs the oxygen. Typical ranges are roughly 13.5 to 17.5 g/dL for men and 12.0 to 15.5 g/dL for women. It is the main number doctors use to diagnose anemia, and it is the "Hb" you will see on many reports.

Hematocrit

Hematocrit is the percentage of your blood volume made up of red cells, about 41–50% in men and 36–44% in women. It usually moves with hemoglobin. If both drop together, anemia is likely. If both rise together, dehydration is a common and harmless cause.

MCV (mean corpuscular volume)

MCV is the average size of your red cells, normally about 80 to 100 femtoliters. It is one of the most useful clues when you are anemic:

Small cells (low MCV): often iron deficiency or an inherited trait such as thalassemia
Large cells (high MCV): often low vitamin B12 or folate, heavy alcohol use, liver disease or some medicines

MCH and MCHC

MCH is the average amount of hemoglobin in each red cell (about 27–33 picograms). MCHC is how concentrated that hemoglobin is inside the cell (about 32–36 g/dL). Low values mean pale, under-filled cells, which usually goes hand in hand with iron deficiency. Doctors read these alongside MCV rather than on their own.

RDW (red cell distribution width)

RDW measures how much your red cells vary in size, usually around 11.5–14.5%. A high RDW means you have a mix of small and large cells. It often rises early in iron, B12 or folate deficiency, sometimes before hemoglobin drops at all, which makes it a handy early warning.

Platelets

Platelets are tiny cell fragments that help your blood clot. A typical count is 150,000 to 450,000 per microliter. Low platelets can cause easy bruising or bleeding and may follow a viral infection, some medicines or liver disease. High platelets are often a short-term reaction to inflammation, infection or iron deficiency.

Comprehensive Metabolic Panel (CMP)

The CMP is a group of 14 tests that shows how your body is handling energy, fluids and waste. It covers blood sugar, your kidneys, your liver and the salts that keep your nerves and muscles firing. The lipid, thyroid and other tests later in this section are not technically part of the CMP, but they are so often ordered alongside it that they belong here.

Glucose

Glucose is the sugar in your blood at the moment it was drawn. After an 8-hour fast, a typical result is 70 to 99 mg/dL. A fasting value of 100 to 125 suggests prediabetes, and 126 or higher on two separate tests suggests diabetes. If you ate before the test, expect a higher number, which is why fasting instructions matter.

Kidney markers

BUN (blood urea nitrogen) measures urea, a waste product made when your body breaks down protein. A common range is about 7 to 20 mg/dL. It rises with dehydration, a high-protein diet or reduced kidney function, and it falls with low protein intake or liver problems. Doctors often compare it with creatinine; you can read more in our guide to the BUN-to-creatinine ratio.
Creatinine is a waste product from normal muscle activity, cleared almost entirely by the kidneys. Typical values run about 0.7 to 1.3 mg/dL in men and 0.6 to 1.1 in women. People with more muscle naturally run higher, so a muscular athlete may sit above the range with perfectly healthy kidneys.
eGFR (estimated glomerular filtration rate) is calculated from your creatinine, age and sex. It estimates how much blood your kidneys filter each minute. A result of 90 or above is generally normal, and a value under 60 that stays there for three months or more can point to chronic kidney disease.

Electrolytes

Electrolytes are minerals that carry an electrical charge. They control fluid balance, nerve signals and your heartbeat.

Sodium (about 135–145 mmol/L) mostly reflects your water balance. Low sodium can follow heavy sweating plus lots of plain water, or certain medicines.
Potassium (about 3.5–5.0 mmol/L) is critical for your heart rhythm. A high result is sometimes false, caused by red cells breaking open during a difficult blood draw, so labs often repeat it.
Chloride and CO2 (bicarbonate) (roughly 96–106 and 23–29 mmol/L) help keep your blood's acid-base balance steady. Shifts can come from vomiting, diarrhea, lung problems or kidney issues.
Calcium (about 8.5–10.2 mg/dL) supports bones, muscles and nerves. Because much of it is carried by albumin, doctors read calcium alongside your albumin level.

Proteins and liver markers

Albumin and total protein: Albumin is the main protein made by your liver, usually 3.5 to 5.0 g/dL. Total protein, about 6.0 to 8.3 g/dL, adds albumin to globulins, the proteins that include antibodies. Low albumin can reflect liver disease, kidney protein loss or poor nutrition.
ALT is an enzyme found mainly in the liver. When liver cells are irritated or damaged, ALT leaks into the blood. Fatty liver, alcohol, some medicines and hepatitis are common causes of a raised ALT.
AST is found in the liver but also in muscle and the heart. That is why a hard workout the day before a test can push AST, and sometimes ALT, above the range with no liver problem at all.
ALP (alkaline phosphatase) comes from the liver, bile ducts and bone. It is often high in growing teenagers and during pregnancy. In adults, a raised ALP may point to a blocked bile duct or a bone condition.
Bilirubin is a yellow pigment made when old red cells break down. High levels can cause jaundice. A mildly raised bilirubin with otherwise normal liver tests is often Gilbert's syndrome, a common and harmless inherited quirk.

Lipid Panel

The lipid panel measures fats in your blood and helps estimate your risk of heart disease. The targets below are common adult guides; your doctor may set different goals based on your overall risk.

Marker	What it is	Common desirable level
Total cholesterol	All cholesterol combined	Under 200 mg/dL
LDL cholesterol	The "bad" type that builds up in arteries	Under 100 mg/dL
HDL cholesterol	The "good" type that clears cholesterol	40+ (men), 50+ (women) mg/dL
Triglycerides	Fat stored from extra calories	Under 150 mg/dL
Non-HDL cholesterol	Total minus HDL; all the harmful types	Under 130 mg/dL

Triglycerides are the most sensitive to a recent meal or a night of drinking, so a fasting test gives the cleanest reading.

Thyroid Panel

TSH (thyroid-stimulating hormone) comes from the pituitary gland and tells your thyroid how hard to work. It is the best first test, usually about 0.4 to 4.0 mIU/L. It works in reverse: a high TSH suggests an underactive thyroid, and a low TSH suggests an overactive one.
Free T4 is the main hormone your thyroid releases. It confirms what TSH is hinting at.
Free T3 is the active form of thyroid hormone. It is mostly checked when an overactive thyroid is suspected.

Hemoglobin A1c

A1c shows the percentage of hemoglobin with sugar stuck to it. Since red cells live about three months, it reflects your average blood sugar over that time, and you do not need to fast. Below 5.7% is normal, 5.7–6.4% suggests prediabetes, and 6.5% or higher suggests diabetes.

Vitamin D (25-hydroxy)

This is the standard measure of your vitamin D stores. Many labs treat under 20 ng/mL as deficient and 30 ng/mL or more as sufficient, though expert groups do not fully agree on the ideal level. Low vitamin D is very common in people who get little sun.

Iron Studies

Serum iron is the iron in your blood right now. It swings a lot through the day and after meals, so it is never read alone.
Ferritin reflects your stored iron and is the best single test for iron deficiency. A low ferritin almost always means low iron stores. A high ferritin can mean iron overload, but it also rises with inflammation.
TIBC and transferrin saturation show how much iron your blood could carry and how much of that capacity is filled. A saturation below about 20% suggests iron deficiency, while a very high one can suggest iron overload.

hs-CRP (high-sensitivity C-reactive protein)

CRP is a protein your liver makes when there is inflammation. The high-sensitivity version picks up low, ongoing inflammation linked to heart risk. Under 1 mg/L is considered low risk, 1 to 3 average, and above 3 higher. A reading above 10 usually points to an acute infection or injury, so the test is best repeated once you are well.

Other blood tests your doctor may order

Beyond the standard panels, doctors order more specific tests when symptoms or earlier results raise a question. You will not see these on a routine report, but it helps to know what they are for.

Allergy tests

IgE allergy blood test:

IgE is the antibody your body makes in allergic reactions. A total IgE gives a general picture, while specific IgE tests check your response to single triggers such as peanuts, dust mites or pollen. A positive result shows sensitivity, not always a true allergy, so it is read alongside your symptoms.

Autoimmune and inflammation tests

Antinuclear antibody (ANA) test: looks for antibodies that attack your own cells. It is used when lupus or a related autoimmune condition is suspected. A low positive result is common in healthy people, so it is never a diagnosis on its own.
C3 complement test: measures a protein in your immune defense system. Low levels can show that complement is being used up, as can happen in active lupus or some kidney conditions.
Erythrocyte sedimentation rate (ESR): measures how fast red cells settle in a tube. Faster settling suggests inflammation somewhere in the body. It is non-specific and naturally rises with age.
Peripheral blood smear: a trained specialist looks at your blood under a microscope to check the shape and look of your cells. It often follows an unusual CBC.

Tumor markers are substances that some cancers release. Common ones include AFP (liver and germ cell tumors), CA-125 (ovarian), calcitonin (a type of thyroid cancer), CA 15-3 and CA 27-29 (breast), CEA (bowel and others), hCG (germ cell tumors, and also pregnancy) and PSA (prostate). None of these is a reliable screening test for most people, because benign conditions can raise them too. They are most useful for tracking a known cancer during and after treatment.

A circulating tumor cell test looks for cancer cells that have broken away from a tumor into the blood. It is used in specific settings, mainly to follow some advanced cancers.

Blood clotting and blood disorder tests

D-dimer: a fragment released when a clot breaks down. A normal result helps rule out a serious clot, while a raised one needs further tests.
Fibrinogen: a clotting protein that also rises with inflammation.
Prothrombin time (PT): how long your blood takes to clot, often reported as INR. It is used to monitor warfarin and to check liver function.
Kappa and lambda free light chains: pieces of antibody proteins. An unusual ratio can point to plasma cell disorders such as myeloma.
Reticulocyte count: young red cells. It shows whether your bone marrow is keeping up, which helps pin down the cause of anemia.

Why the same result can be fine for one person and a flag for another

A lab range is one-size-fits-all, but bodies are not. The same number can be expected for one person and worth a closer look for another.

Age and sex

Many markers shift with age and sex. Women tend to have lower hemoglobin and ferritin, largely because of menstruation. Creatinine rises with muscle mass, and eGFR naturally declines as we get older. ALP is high in teenagers because their bones are still growing. A good lab adjusts some ranges for this, but not all of them.

Training load

Hard exercise leaves a mark on your blood. A heavy leg day or a long run can raise AST, ALT and creatine kinase (CK) for several days. Endurance athletes often have slightly lower hemoglobin because their plasma volume expands, and higher creatinine because they carry more muscle. For an active person, easing off training for two or three days before a test gives a truer picture.

Time since your last meal

Eating raises glucose and triglycerides within hours, and a big meal can cloud results for longer. That is why many tests ask you to fast for 8 to 12 hours. Water is usually fine and actually helps.

Time of day, hydration and sleep

Some markers follow a daily rhythm. Cortisol and iron are higher in the morning, and TSH is highest overnight. Being dehydrated concentrates your blood, nudging up hemoglobin, hematocrit, albumin and BUN. A short or broken night of sleep can raise glucose and stress hormones. For the most comparable results, test at the same time of day, well rested and well hydrated, each time.

Seeing your results over time

Why one report is not the full picture

A single report is a photo; a series of reports is a film. Say your ALT came back at 48 U/L. If it was 22 last year and 35 six months ago, that steady climb is worth talking about, even if 48 sits inside your lab's range. If it has hovered around 45 for five years, it is probably just your baseline. The only way to know which story is true is to compare results side by side, ideally from tests taken under similar conditions.

How Vidaya AI reads your lab PDF

Most people keep their results as a pile of PDFs from different labs, each with its own units and ranges. Vidaya AI reads your lab PDF, pulls out every marker, converts units where needed and lines each value up against your own past results. Instead of a wall of numbers, you see which markers are stable, which are drifting and which have moved sharply.

Ask questions about your results with Vaya Chat

Once your results are in, you can ask Vaya Chat questions in plain language, such as "Why is my RDW high?" or "Has my ferritin improved since I started iron?" It answers using your own history, which makes the conversation with your doctor more focused and more useful.