To check body fat, use a body-composition test: DEXA scan or hydrostatic weighing are most accurate; Bod Pod is also reliable. Simpler options include calibrated bioelectrical-impedance scales or skinfold calipers performed by a trained person. Measure circumferences (waist, hip) and repeat under consistent hydration/fasting conditions to track changes. For clinical concerns, seek assessment from healthcare or a certified technician.

Accuracy depends on the method. Laboratory techniques like DEXA or hydrostatic weighing are the most accurate for total and regional body-fat estimates. Consumer methods (BIA scales, handheld devices, skinfold calipers) are quicker and cheaper but prone to errors from hydration, recent exercise, and operator skill, so results can vary widely. Use a consistent method to track trends and consult professionals for clinical decisions.

No, 20% body fat is not typically "chubby." For adult men, 20% sits around the average range and is below obesity thresholds; for adult women, 20% is generally lean or fit. Ideal ranges vary with age and sex. Overall health depends more on body composition, fat distribution, muscle mass and metabolic markers than a single percentage.

A DEXA full-body fat analysis uses dual-energy X‑ray absorptiometry to measure total and regional body composition—fat mass, lean (muscle) mass, and bone mineral content. It provides precise, reproducible percentages and distribution of body fat with low radiation exposure in a quick, noninvasive scan. Clinicians use it to assess obesity, sarcopenia, and monitor treatment or training changes over time.

Cost varies by method and location: home bioelectrical-impedance scales $20–200; clinic BIA or gym assessments $10–50 per session; skinfold caliper measurements $10–60 (self-purchase cheaper, technician fees higher); DEXA scans $50–300; Bod Pod or hydrostatic weighing typically $50–150. Prices depend on country, facility, and whether the test is bundled with other services.

The BCA protein assay mixes your sample with a bicinchoninic acid–copper reagent; proteins reduce Cu2+ to Cu1+, forming a purple complex. Prepare standards, add working reagent to standards and samples, incubate (commonly ~30 minutes at 37°C), then measure absorbance at 562 nm. Compare sample readings to the standard curve to determine protein concentration.