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Total cholesterol
The sum of all cholesterol types in the blood, measured within the lipid profile.
Other names: Total cholesterol, lipid profileSection: Blood chemistry
Updated: August 29, 2026·MedProtect editorial team Reference information — not a diagnosis or a prescription
In shortBelow 200 mg/dL (5.18 mmol/L) is considered optimal; 200–239 mg/dL (5.18–6.19 mmol/L) is borderline high, and 240 mg/dL (6.22 mmol/L) or more is high.
Reference ranges
Group
Reference range
Optimal
Less than 200 mg/dL (5.18 mmol/L)
Borderline high
200–239 mg/dL (5.18–6.19 mmol/L)
High
240 mg/dL (6.22 mmol/L) or more
Age 19 or younger
Less than 170 mg/dL (4.40 mmol/L)
Normal value ranges vary slightly among different laboratories. The healthy level for you may depend on age, family history, lifestyle, and other heart-disease risk factors.
Check your value
Enter the number from your lab report — see how it compares with the typical range. Mind the units shown in the chosen row.
A rough comparison with a typical range, not a diagnosis. Reference ranges vary between laboratories — check the range on your own report and let a clinician interpret the result.
What this marker is
Cholesterol is a fatty, wax-like substance found in all parts of the body. The total cholesterol test measures all types of cholesterol in the blood at once, and it is usually done as part of a lipid profile — a panel that also reports LDL cholesterol, HDL cholesterol, triglycerides, and VLDL cholesterol.
The test exists to estimate the risk of heart disease. A high total cholesterol level may lead to atherosclerosis — cholesterol-rich plaque building up inside the arteries — which increases the risk of heart attack and stroke. The total number is a starting point: what the LDL and HDL fractions are doing matters at least as much.
Results are reported in milligrams per deciliter (mg/dL); in millimoles per liter (mmol/L) in many countries. What counts as a healthy level for a specific person also depends on age, family history, lifestyle, and other risk factors for heart disease, so the categories are a general frame rather than a personal verdict.
Preparation is specific: nothing to eat for 9 to 12 hours before the test. Alcohol and some medicines can interfere with the result, so the provider needs to know everything you take, including over-the-counter medicines and supplements.
When it is high
Diet and lifestyleA diet high in saturated fats, lack of physical activity, stress, drinking too much alcohol, and being overweight or having obesity are the everyday drivers of high cholesterol.
Diabetes and metabolic syndromeBoth conditions disturb fat metabolism and commonly push cholesterol up.
Familial combined hyperlipidemiaAn inherited disorder in which the blood carries high amounts of cholesterol and triglycerides.
Underactive thyroidHypothyroidism slows cholesterol clearance and is a classic hidden cause of a high result.
Kidney or liver diseaseBoth organs take part in lipid handling, and their diseases raise cholesterol.
Certain medicinesSome medicines raise cholesterol as a side effect, which is why the medication list is part of the preparation.
When it is low
Usually desirableA low total cholesterol level is usually considered desirable — for total cholesterol, lower is generally better.
When low is a warningUnusually low values can accompany an overactive thyroid, severe liver disease, malabsorption, malnutrition, cancer, or a rare genetic disorder that runs in families — in those cases low is not a good sign.
What can skew the result
These factors can shift the value without any disease — worth considering before a retest:
Food eaten within 9–12 hours before the testAlcoholCertain medicines and supplements
How to prepare
Do not eat for 9 to 12 hours before the test. Alcohol and some medicines can interfere; tell your provider about everything you take, and do not stop any medicine without asking first.
When a retest makes sense
An abnormal total is read with the LDL, HDL, and triglyceride numbers from the same lipid profile. If cholesterol is high, the provider may recommend lifestyle changes and, depending on heart-disease risk, cholesterol-lowering medicine — lifestyle changes continue alongside any medicine.
Who usually reviews this result
A result outside the reference range is usually reviewed by: your GP or primary care doctor; a cardiologist if cardiovascular risk is the concern. Bring your lab report and any previous results to the appointment.
Names used on lab reports
Your report may use any of these names: Total cholesterolCholesterol testLipid profileLipid panel
Units and conversion
Measured in: mg/dL
mg/dL=mmol/L
mg/dL × 0.0259 = mmol/L. Example: 200 mg/dL = 5.18 mmol/L. Results are rounded to 2 decimal places.
Several markers on your report?
See how MedProtect explains results in the app: the whole report, a check of the recognized values, and a clear breakdown.
Yes — for a reliable result you should not eat for 9 to 12 hours before the test. Water is fine; food is not. Your provider's instructions take precedence.
Is a low cholesterol level ever bad?
Usually low total cholesterol is desirable. But very low values can come with an overactive thyroid, severe liver disease, malabsorption, malnutrition, cancer, or a rare inherited disorder — context decides.
What matters more: total cholesterol or LDL?
They answer different questions. Total cholesterol sums everything; LDL is the fraction that builds arterial plaque. Providers look at the whole lipid profile, and LDL goals are set individually when heart disease or its risk factors are present.
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