NormRangeWhat the normal range is at your age — with the source printed on the page.

NormRange

What the normal range is at your age — with the source printed on the page.

SectionsLatest
Vitals by AgeBlood pressure, resting heart rate and temperature ranges.3120
Lab ValuesA1C, glucose, cholesterol and what each unit converts to.8954
Weight-Based DosingOver-the-counter dose tables that already exist on labels.5
Unit Conversionsmg/dL to mmol/L and the rest of the everyday set.5
  1. What Counts as a Fever — 100.4°F, and Where You Measured MattersVitals by Age · 3 min read

    The number is only half the answer. An armpit reading and a rectal reading of the same child differ by about a degree and a half.

  2. CBC Normal Ranges — What Each Line on the Result MeansLab Values · 3 min read

    A value marked high or low on a CBC is common and is often not significant on its own. The pattern across lines is what a clinician reads.

  3. Pulse Oximeter Accuracy — Roughly ±2%, and Less in Some SituationsVitals by Age · 3 min read

    The device measures light through a finger. Everything that changes how light passes through a finger changes the number.

  4. BMI — The Formula, the Categories, and Four Things It Cannot SeeUnit Conversions · 4 min read

    A single ratio of two measurements cannot distinguish muscle from fat, and it was never intended to.

  5. Cholesterol Numbers: What Total, LDL, HDL and Triglycerides MeanLab Values · 3 min read

    A lipid panel reports four numbers and the one printed largest — total cholesterol — is the least useful of them.

  6. Ibuprofen vs Acetaminophen: Different Drugs, Different Ceilings, Different RisksWeight-Based Dosing · 3 min read

    They are not two brands of the same thing. One reduces inflammation and troubles the stomach and kidneys; the other does neither and troubles the liver.

  7. Pounds to Kilograms for Dosing: Divide by 2.2, and Never Round UpUnit Conversions · 3 min read

    Divide by 2.2. The arithmetic is trivial; the part worth knowing is which direction to round when the answer lands between two lines on a chart.

  8. TSH Normal Range: 0.4–4.0 mIU/L, and the Number Moves BackwardsLab Values · 3 min read

    TSH runs opposite to the gland it measures. High TSH means the thyroid is underactive, and that inversion catches almost everyone reading their own result.

  9. What Is Low Blood Pressure? Below 90/60, and the Symptoms Matter MoreVitals by Age · 3 min read

    Low blood pressure is the one vital sign where the number alone says least. A healthy person at 95/60 and an unwell person at 95/60 are not in the same situation.

  10. Lab Unit Conversion Chart: Conventional to SI for Common Blood TestsUnit Conversions · 3 min read

    Every analyte has its own factor because every molecule has its own weight. One universal converter does not exist and any page offering one is wrong.

  11. Benadryl Dosage for Adults: 25–50 mg Every 4–6 Hours, 300 mg Daily MaximumWeight-Based Dosing · 3 min read

    The dose is simple. What has changed is who should take it — several bodies now advise against diphenhydramine in adults over 65 entirely.

  12. eGFR Normal Range: Above 90, and the Stages Below ItLab Values · 3 min read

    eGFR is an estimate built from creatinine, age and sex — and the estimate is better than the raw creatinine it comes from, for a reason worth understanding.

  13. Respiratory Rate by Age: 12–20 for Adults, Much Faster for ChildrenVitals by Age · 3 min read

    The most informative vital sign and the least often taken. It is also the only one that changes the moment the person knows you are measuring it.

A1C result by value

76 calculations · Lab Values · browse all

Albumin by value

36 calculations · Lab Values · browse all

Alkaline phosphatase by value and age

228 calculations · Lab Values · browse all