Tools in This Collection
Blood Pressure Chart
AHA blood pressure categories: normal, elevated, hypertension stages
Resting Heart Rate Chart
Normal resting heart rate ranges by age and fitness level
Blood Test Normal Ranges
Reference ranges for CBC, metabolic panel, and common lab values
How to Read a Blood Test
Explains lab report sections, H/L flags, and key markers
Vitamin & Mineral Daily Values
RDA and upper intake levels for vitamins and minerals
Vaccine Schedule Reference
CDC-recommended immunization schedule for children and adults
How to Read a Nutrition Label
FDA nutrition label format explained with 2020 updates
Health Reference Lookup Workflow
Health reference lookups are most useful when you have a number in hand — a blood pressure reading, a lab result value, a resting heart rate — and need to know what it means. These charts give you the reference ranges and context to interpret readings, not to diagnose conditions. Always review findings with a healthcare provider for personalized guidance.
Blood Pressure: AHA Classification Ranges
The American Heart Association classifies blood pressure in five categories. Normal: systolic below 120 AND diastolic below 80. Elevated: systolic 120-129 AND diastolic below 80. Stage 1 hypertension: systolic 130-139 OR diastolic 80-89. Stage 2 hypertension: systolic 140+ OR diastolic 90+. Hypertensive crisis (seek immediate care): systolic 180+ OR diastolic 120+. For reference, a reading of 125/82 falls in Stage 1 hypertension — the systolic (125) is in the elevated range but the diastolic (82) crosses the Stage 1 threshold. The Blood Pressure Chart shows all five AHA categories with color coding for quick reference.
Resting Heart Rate: Normal Ranges by Age
Normal resting heart rate for adults is 60-100 beats per minute (bpm). Athletes typically have lower resting heart rates (40-60 bpm) due to increased cardiovascular efficiency. Rates below 60 bpm (bradycardia) in non-athletes may warrant evaluation. Rates above 100 bpm (tachycardia) at rest are generally above normal. Children have higher normal ranges: newborns 120-160 bpm, 1-3 years 80-130 bpm, 3-5 years 80-120 bpm, 6-10 years 70-110 bpm. The Resting Heart Rate Chart shows normal ranges by age and fitness level.
Blood Test Normal Ranges: CBC and Metabolic Panels
Blood test results include reference ranges printed alongside each value, but knowing what the key markers mean helps you ask better questions. Complete Blood Count (CBC) key values: hemoglobin normal range 13.5-17.5 g/dL for men, 12.0-15.5 g/dL for women; white blood cells 4,500-11,000 cells/μL; platelets 150,000-400,000/μL. Basic Metabolic Panel (BMP): glucose fasting 70-100 mg/dL (prediabetes 100-125, diabetes 126+); creatinine 0.7-1.3 mg/dL men, 0.5-1.1 mg/dL women; potassium 3.5-5.0 mEq/L. The Blood Test Normal Ranges chart covers all major values with units. The How to Read a Blood Test guide explains report sections, H/L flags, and which trends to track over time.
Vitamins, Minerals, and Daily Values
The FDA's Daily Values (DV) are based on 2,000 calorie diets and appear on nutrition labels. Key values: Vitamin D 800 IU (20 mcg) DV; Calcium 1,300 mg DV; Iron 18 mg DV; Vitamin C 90 mg DV; Potassium 4,700 mg DV; Sodium 2,300 mg DV upper limit. The Vitamin and Mineral Daily Values reference lists RDA (Recommended Dietary Allowance), DV, and tolerable upper intake levels for all 20+ major micronutrients. The How to Read a Nutrition Label guide explains the 2020 FDA label format including the added sugars row, updated serving sizes, and dual-column format for packages containing 2-3 servings. The Vaccine Schedule Reference provides the CDC-recommended immunization schedule for children and adults.
Frequently Asked Questions
What is a normal blood pressure reading?
According to AHA guidelines, normal blood pressure is below 120/80 mmHg (systolic/diastolic). Elevated is 120-129 systolic with diastolic below 80. Stage 1 hypertension is 130-139 systolic OR 80-89 diastolic. Stage 2 hypertension is 140+ systolic OR 90+ diastolic. A single reading above normal doesn't confirm hypertension — multiple readings over time are used for diagnosis. The Blood Pressure Chart shows all categories with color-coded ranges.
What is a healthy resting heart rate?
Normal resting heart rate for adults is 60-100 bpm. Athletes often have 40-60 bpm due to greater heart efficiency. A rate consistently below 60 bpm in non-athletes or above 100 bpm at rest warrants a medical evaluation. Measure your resting heart rate in the morning before getting out of bed for the most accurate baseline. Count your pulse for 60 seconds, or count for 30 seconds and multiply by 2.
What do H and L flags on blood test results mean?
H (high) and L (low) flags indicate a value is outside the laboratory's reference range for that test. Reference ranges are typically set to include 95% of healthy adults, so 5% of healthy people will have a flagged value on any given test. A single flagged value doesn't necessarily indicate a problem — context, trends over time, and symptoms matter. Your healthcare provider uses the full clinical picture to interpret flagged values, not just the flag itself.
What are the most important vitamins to track?
Most adults in the US are commonly deficient in Vitamin D (40-70% of Americans), Magnesium (45%), and Iron (especially women). Vitamin B12 deficiency is common in older adults and those on plant-based diets. Vitamin D DV is 800 IU (20 mcg); Magnesium DV is 420 mg for men, 320 mg for women; Iron DV is 18 mg (8 mg for men, 18 mg for women of childbearing age). Blood tests can confirm deficiencies before supplementing.