Women's Health
How reference ranges and health measurements differ for women.
A number of standard health measurements are interpreted differently for women, and several widely used equations carry sex-specific constants — the eGFR equation, the Mifflin-St Jeor equation and many laboratory reference ranges among them. Pregnancy changes the interpretation of blood pressure, glucose and kidney function substantially, and several standard tools are simply not validated during it. This hub explains where sex-based differences in measurement genuinely exist, where they are a legacy of study populations, and which numbers need a different frame entirely during pregnancy.
Women's Health guides
Plain-English explanations of what these measurements mean.
Blood TestsVitamin D and Vitamin B12 Blood Tests: Units, Ranges and Limits
Vitamin D is measured as 25-hydroxyvitamin D and reported in ng/mL or nmol/L, while B12 is judged from a blood level that sometimes needs a second test to interpret. Here is how…
9 min read
General WellnessWaist Circumference, Waist-to-Height and Waist-to-Hip Ratio Explained
Where weight is carried says something that BMI cannot. Waist circumference, waist-to-height ratio and waist-to-hip ratio each measure central fat in a different way, with cut-p…
8 min read
Women's HealthIron, Hemoglobin and Ferritin: Why the Ranges Differ for Women
Hemoglobin reference ranges are lower for women and ferritin ranges differ too, largely because menstrual blood loss makes iron deficiency far more common before menopause. Ferr…
8 min read
Women's HealthWhich Health Calculators Do Not Apply During Pregnancy
Pregnancy changes blood volume, kidney filtration, red cell turnover and energy requirements, and most everyday health equations were derived in people who were not pregnant. He…
8 min read
Kidney HealthWhat Is eGFR? Understanding Kidney Function
eGFR estimates how much blood your kidneys filter each minute, calculated from creatinine, age and sex rather than measured directly. A single result does not establish kidney d…
9 min read
NutritionBMR vs TDEE: Understanding Daily Calorie Needs
BMR is the energy your body uses at complete rest; TDEE adds everything else you do. Both are predicted from equations rather than measured, and the predictions carry a margin o…
8 min read