Blood Test Results Explained: Complete 2026 Guide with Normal Ranges
Got your blood test results back and confused by the numbers? This comprehensive guide explains the most common blood test markers, their normal ranges, and what abnormal values might indicate.
Complete Blood Count (CBC)
A CBC is the most commonly ordered blood test. It measures the different types of cells in your blood and can help detect a wide range of conditions from anemia to infection.
| Marker | Normal Range (Men) | Normal Range (Women) | Unit |
|---|---|---|---|
| Hemoglobin (HGB) | 13.0–17.5 | 12.0–16.0 | g/dL |
| Red Blood Cells (RBC) | 4.5–5.5 | 3.8–5.1 | million/mcL |
| White Blood Cells (WBC) | 4,000–10,000 | /mcL | |
| Platelets (PLT) | 150,000–400,000 | /mcL | |
| Hematocrit (HCT) | 40–52% | 36–48% | % |
| ESR | 0–15 | 0–20 | mm/hr |
Hemoglobin — Why It Matters
Hemoglobin is the protein in red blood cells that carries oxygen from your lungs to every tissue in your body. Low hemoglobin (anemia) can cause fatigue, weakness, and shortness of breath. High hemoglobin may indicate dehydration, lung disease, or living at high altitude.
White Blood Cells — Your Immune Army
WBCs are your body's defense system. Elevated WBC count often signals infection or inflammation. Low WBC count may indicate bone marrow problems, autoimmune conditions, or medication side effects.
Metabolic Panel (CMP/BMP)
| Marker | Normal Range | What It Measures |
|---|---|---|
| Glucose (fasting) | 70–100 mg/dL | Blood sugar levels |
| Total Cholesterol | <200 mg/dL | Cardiovascular risk |
| LDL Cholesterol | <100 mg/dL | "Bad" cholesterol |
| HDL Cholesterol | >40 (M) / >50 (F) | "Good" cholesterol |
| Triglycerides | <150 mg/dL | Blood fat levels |
| Creatinine | 0.7–1.2 (M) / 0.5–0.9 (F) mg/dL | Kidney function |
| ALT | <41 U/L | Liver function |
| AST | <40 U/L | Liver function |
Inflammation Markers
CRP (C-Reactive Protein)
CRP is one of the most important inflammation markers. Normal: below 5 mg/L. Elevated CRP indicates an inflammatory process in your body — this could be an infection, injury, or chronic disease.
ESR (Erythrocyte Sedimentation Rate)
ESR also measures inflammation but changes more slowly than CRP. Elevated ESR may indicate infection, autoimmune disease, or other conditions.
Thyroid Function Tests
| Marker | Normal Range | What It Measures |
|---|---|---|
| TSH | 0.4–4.0 mIU/L | Thyroid-stimulating hormone |
| Free T4 | 0.8–1.8 ng/dL | Thyroxine (thyroid hormone) |
| Free T3 | 2.3–4.2 pg/mL | Triiodothyronine |
Vitamins & Minerals
| Marker | Normal Range | Deficiency Symptoms |
|---|---|---|
| Vitamin D | 30–60 ng/mL | Fatigue, bone weakness, weakened immunity |
| Vitamin B12 | 200–900 pg/mL | Anemia, numbness, memory problems |
| Iron | 60–170 mcg/dL | Anemia, fatigue, hair loss |
| Ferritin | 20–250 (M) / 10–120 (F) ng/mL | Iron stores indicator |
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Analyze my results for free →When to See a Doctor
- If results are significantly outside normal range (more than 2x)
- If you have unexplained symptoms along with abnormal results
- If results are consistently worsening between tests
- If your doctor recommended follow-up testing
Read Also
- Hemoglobin Levels: Normal Range, Low & High — What to Do
- CRP Test Explained: What It Is, Normal Range & What High CRP Means
Sources: World Health Organization (WHO), UpToDate Clinical Reference, PubMed Medical Research Database.