Five sourced questions
Health literacy · 12 answers
Body basics worth knowing — plain-language answers to the everyday health questions almost everyone has.
Answer: 120/80 mmHg
Common U.S. categories label systolic pressure below 120 and diastolic pressure below 80 mmHg as normal. Categories and treatment decisions depend on repeated, correctly taken measurements and the person's overall health; one reading alone does not establish a diagnosis.
Topic reference: NIH MedlinePlus · reviewed 2026-07-28
Answer: 60–100 beats per minute
A resting rate of 60–100 beats per minute is a common adult reference range, though trained athletes and some medicines can produce lower rates. Symptoms, rhythm, context, and a person's usual rate matter more than treating the range as a diagnosis.
Topic reference: NIH MedlinePlus · reviewed 2026-07-28
Answer: The skin
Your skin is the largest organ — a square-meters-wide barrier that keeps water in, germs out, and helps regulate temperature. That's why skin health isn't just cosmetic: protecting it from sunburn and checking for changes is part of taking care of the whole body.
Topic reference: NIH MedlinePlus · reviewed 2026-07-28
Answer: About 60%
The often-cited adult estimate is about 60%, but the proportion varies with age, sex, and body composition. Fluid needs also vary with health, activity, environment, pregnancy, and medicines; some heart or kidney conditions require individualized limits.
Topic reference: NIH MedlinePlus · reviewed 2026-07-28
Answer: 206
Adults have 206 bones. Babies start with about 300, and many fuse together as we grow. Bones aren't just scaffolding — they store minerals and make blood cells. Weight-bearing activity and enough calcium and vitamin D help keep them strong over a lifetime.
Topic reference: NIH MedlinePlus · reviewed 2026-07-28
Answer: Lower LDL is generally favorable; HDL is interpreted with the rest of the risk picture
Lower LDL is generally associated with lower cardiovascular risk, but targets depend on a person's overall risk and history. HDL is not simply a score to maximize; clinicians interpret it with LDL, triglycerides, blood pressure, smoking, diabetes, age, and other factors.
Topic reference: NIH MedlinePlus · reviewed 2026-07-28
Answer: A screening ratio of weight to height
BMI is a simple ratio of weight to height used as a screening tool for populations — not a diagnosis or a verdict on any one person's health. It doesn't distinguish muscle from fat. It's one data point among many; a clinician looks at the whole picture, not a single number.
Topic reference: NIH MedlinePlus · reviewed 2026-07-28
Answer: Filtering waste and extra fluid from the blood
The kidneys remove waste and extra fluid, help balance electrolytes and acid, support blood-pressure regulation, and produce hormones involved in red blood cells and bone health. Fluid and diet advice can differ for people with kidney, heart, or other conditions.
Topic reference: NIH MedlinePlus · reviewed 2026-07-28
Answer: Follow the lab or clinician's exact instructions for food, drink, timing, and medicines
Fasting instructions vary by test and patient. They may specify a time without food and which drinks or medicines are allowed. Do not assume every test needs fasting or change a medicine on your own; follow the ordering clinician or laboratory's instructions.
Topic reference: NIH MedlinePlus · reviewed 2026-07-28
Answer: around 98.6°F (37°C)
About 98.6°F (37°C) is the classic average, but normal varies from person to person and across the day, and slightly lower averages are common. What matters more than one reading is your own baseline — knowing your usual makes an unusual number easier to spot.
Topic reference: NIH MedlinePlus · reviewed 2026-07-28
Answer: Your average blood sugar over about the last 3 months
A1C reflects your average blood sugar over roughly the past two to three months, so it smooths out day-to-day swings. It's used to screen for and monitor diabetes. Because it's an average, it pairs well with the fuller picture your clinician builds over time.
Topic reference: CDC: A1C test for diabetes and prediabetes · reviewed 2026-07-28
Answer: The pressure when the heart beats (systolic)
The top number is systolic pressure — the push when your heart beats — and the bottom is diastolic, the pressure when it rests between beats. Both matter. Reading them as one story ('systolic over diastolic') is how clinicians judge whether blood pressure is in a healthy range.
Topic reference: NIH MedlinePlus · reviewed 2026-07-28
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Explanations draw on public, authoritative sources (HHS/HIPAA, CMS, the No Surprises Act, IRS 501(r), FDA, USPSTF, CDC). General information, not medical advice. Reviewed by MedicalRecords.com Editorial · sources checked July 28, 2026.