What Do Your Blood Test Results Mean?

What do your blood test results mean? Common blood tests, such as a complete blood count (CBC), a metabolic panel, a cholesterol panel, A1C, and a thyroid test, give a snapshot of how your body is working. Each result is compared to a reference range, which is the range seen in most healthy people. A result slightly outside that range does not always mean something is wrong. At Urgent Care & Family Medicine in Conway, SC, our providers order labs at our on-site lab and walk you through what your numbers mean for you. This guide explains the basics so you can feel more confident at your next visit.

What Is a Reference Range?

A reference range is the span of values that most healthy people fall within. Your report may flag results as high (H) or low (L) when they are outside that range. Keep in mind:

• Ranges vary somewhat from lab to lab, so always compare your result to the range printed on your own report
• About 5% of healthy people fall slightly outside a typical range on any given test
• Age, sex, pregnancy, hydration, recent meals, exercise, and medicines can all affect results
• A single result is less important than the overall pattern and your symptoms

The ranges in this article are general examples. Your provider will interpret your results based on your lab’s ranges and your health history.

What Does a Complete Blood Count (CBC) Show?

A CBC looks at the cells in your blood:

• White blood cells (WBC): fight infection. A typical range is roughly 4,500 to 11,000 cells per microliter. High counts can point to infection, inflammation, or stress on the body. Low counts can come from some viral infections, medicines, or bone marrow problems.
• Hemoglobin and hematocrit: measure your red blood cells, which carry oxygen. Low values suggest anemia, which can cause tiredness and shortness of breath. Typical hemoglobin ranges are roughly 12 to 15.5 g/dL for women and 13.5 to 17.5 g/dL for men.
• Platelets: help your blood clot. A typical range is about 150,000 to 450,000 per microliter.
• MCV: the average size of red blood cells, which can help identify the type of anemia, such as iron deficiency or low B12.

What Does a Metabolic Panel Show?

A basic or comprehensive metabolic panel (BMP or CMP) checks several important body functions:

• Glucose: your blood sugar. A fasting level of about 70 to 99 mg/dL is generally normal. 100 to 125 suggests prediabetes, and 126 or higher on repeat testing suggests diabetes.
• Electrolytes: sodium, potassium, chloride, and carbon dioxide help control fluid balance, nerves, and muscles. They can be off with dehydration, vomiting, kidney problems, or some medicines.
• Kidney function: BUN and creatinine show how well your kidneys filter waste. An estimated GFR (eGFR) of 60 or higher is generally considered adequate kidney function, with 90 or higher being normal for most adults.
• Liver tests (CMP only): ALT, AST, alkaline phosphatase, and bilirubin. Mild elevations are common and can come from fatty liver, alcohol, or medicines.
• Calcium and protein levels: including albumin.

What Do Cholesterol Numbers Mean?

A lipid panel measures the fats in your blood. General targets for adults include:

• Total cholesterol: below 200 mg/dL is considered desirable
• LDL (bad cholesterol): below 100 mg/dL is considered optimal for many people. Your goal may be lower if you have heart disease or diabetes.
• HDL (good cholesterol): higher is better. Below 40 mg/dL in men or 50 mg/dL in women is considered low.
• Triglycerides: below 150 mg/dL is considered normal

Your provider looks at cholesterol alongside your blood pressure, blood sugar, smoking status, age, and family history to estimate your overall heart risk. Read more about high blood pressure.

What Does an A1C Test Show?

A1C reflects your average blood sugar over about the past three months. Below 5.7% is normal, 5.7% to 6.4% indicates prediabetes, and 6.5% or higher on repeat testing indicates diabetes. For people being treated for diabetes, a common goal is below 7%, though your goal may differ. Learn more about diabetes care in Conway.

What Does a Thyroid Test Show?

TSH (thyroid-stimulating hormone) is the main screening test for thyroid problems. A typical range is about 0.4 to 4.0 mIU/L, though ranges vary by lab. A high TSH often means an underactive thyroid, and a low TSH often means an overactive thyroid. Read about thyroid problems and fatigue.

Do You Need to Fast Before Blood Work?

Some tests, like fasting glucose and certain cholesterol panels, are more accurate after fasting for 8 to 12 hours. Many other tests, including A1C, CBC, and thyroid tests, do not require fasting. Ask when your labs are ordered. If you do fast, drink water and take your usual medicines unless told otherwise.

What Should You Do If a Result Is Abnormal?

Do not panic. Many abnormal results are mild, temporary, or explained by something simple, like dehydration or a recent illness. Your provider may:

• Repeat the test to confirm the result
• Order additional tests to find the cause
• Review your medicines and supplements
• Recommend lifestyle changes
• Start treatment or refer you to a specialist

Avoid making changes to your medicines based on a lab report alone. Talk with your provider first.

Why Choose Urgent Care & Family Medicine in Conway?

Our clinic at 235 Singleton Ridge Road is open Monday through Friday from 8:30 AM to 5:30 PM and Saturday from 9:00 AM to 1:00 PM. Our on-site lab makes blood work convenient, and our family medicine providers take the time to explain your results. We accept most major insurance and offer clear self-pay rates.

What Other Common Tests Might You See?

Depending on your symptoms and health history, your provider may order other tests as well:

• Vitamin D: low levels are common, especially in people who spend most of their time indoors
• Vitamin B12 and folate: low levels can cause anemia, fatigue, and tingling in the hands and feet
• Iron studies and ferritin: help diagnose iron deficiency, a common cause of anemia, especially in women with heavy periods
• Urinalysis: checks urine for infection, blood, protein, and sugar, and can be helpful for kidney health and urinary tract infections
• Inflammation markers: such as CRP or sed rate, which can rise with infection or inflammatory conditions
• PSA: a prostate screening test that some men choose after discussing benefits and risks with their provider

How Can You Get the Most Accurate Results?

A few simple steps help make your results reliable. Follow fasting instructions when they apply. Drink water before your blood draw, since being well hydrated makes veins easier to find and keeps some results from looking falsely high. Avoid heavy exercise the day before, which can temporarily raise certain muscle and liver enzymes. Tell your provider about supplements you take, since some, like biotin, can interfere with certain tests. If you were sick recently, mention it, because a recent infection can affect your white blood cell count and other values.

Why Track Results Over Time?

One of the biggest benefits of having a regular provider is the ability to compare your results year to year. A cholesterol or blood sugar value that is creeping upward, even within the normal range, can be an early signal to make changes. Keep copies of your results, or use the records your provider gives you, so trends are easy to see. Read why it helps to have a primary care provider in Conway.

Bring a list of questions about your results to your follow-up visit. Understanding your numbers is one of the best ways to take an active role in your own health.

Frequently Asked Questions

How long do blood test results take?

Many routine results are available within a few days. Some specialized tests take longer. Your provider will tell you what to expect.

Do I need to fast before my blood test?

Only for certain tests, such as fasting glucose and some cholesterol panels. A1C, CBC, and thyroid tests usually do not require fasting.

What does it mean if my result is flagged high or low?

It means the value is outside the lab\u2019s reference range. Many slightly abnormal results are not serious. Your provider will explain what it means for you.

Can I get lab work done at your clinic?

Yes. Our Conway clinic has an on-site lab, so many tests can be drawn during your visit.

How often should I get routine blood work?

It depends on your age, health conditions, and medicines. Many adults have labs during an annual physical.