# Body Composition Analysis: DEXA, BIA and Result Limitations Body composition analysis estimates body compartments such as fat mass, lean soft tissue, bone mineral or body water. Methods include DEXA and bioelectrical impedance analysis (BIA). Each method uses assumptions and has measurement error. ## In simple terms DEXA uses low-dose X-rays to estimate bone mineral and soft-tissue composition by region. BIA sends a small electrical current and estimates compartments from impedance, body measurements and an algorithm. BIA is especially sensitive to hydration, recent food, exercise and device equations. Results from different machines should not be treated as interchangeable. Small short-term changes may reflect water or measurement conditions rather than tissue change. ## Why it matters during GLP-1 care Analysis can add context when the goal includes preserving function and lean tissue, but it does not determine whether treatment is successful. Strength, symptoms, nutrition, waist trend, laboratory context and quality of life may matter too. ## India context If repeating a test, use the same validated device and similar time, hydration, meal and exercise conditions. Ask what method, units and reference data are used. Testing is optional for many people and should not become a barrier to care. ## When to contact a doctor DEXA involves a small radiation exposure and requires pregnancy screening under the facility's protocol. People with implanted electronic devices should check manufacturer and clinical advice before BIA. Report severe weakness, repeated falls or rapid unexplained change. ## FAQs ### Which method is most accurate? No routine method is perfect. DEXA is more detailed, while BIA is convenient but more hydration-sensitive. ### Can I compare two different smart scales? Not reliably. Their algorithms and electrodes may differ. ### Does lean-mass loss equal muscle loss? No. Lean mass includes water and other non-fat tissues. ## Related glossary terms - [Body composition](/glossary/body-composition) - [Lean body mass](/glossary/lean-body-mass) - [DEXA scan](/glossary#dexa-scan) - [Weight](/glossary#weight) - [Resistance training](/glossary/resistance-training) - [Bioelectrical impedance analysis](/glossary/bioelectrical-impedance-analysis) - [Muscle and lean mass](/muscle-loss-on-ozempic-how-indians-can-protect-lean-mass-while-losing-fat) ## References - [Obesity Medicine Association: Body-composition assessment](https://pmc.ncbi.nlm.nih.gov/articles/PMC10661987/) - [ICMR-NIN: Dietary Guidelines for Indians 2024](https://www.nin.res.in/dietaryguidelines/pdfjs/locale/DGI07052024P.pdf) *Educational information only. This page does not diagnose a condition, determine eligibility or replace individual medical advice. Medicine choice, dose, monitoring and urgent-care decisions require a qualified clinician and the current product-specific Indian prescribing information.* ## Navigation - [Browse glossary](https://blogs.sugarfitglp.com/glossary) ## Related glossary guides ### Body Composition During Weight Loss: Fat, Lean Mass and Water Query: body composition meaning weight loss Body composition describes the components that make up body weight, commonly including fat mass, lean soft tissue, bone mineral and body water. It is different from body weight,... - [Body Composition During Weight Loss: Fat, Lean Mass and Water](https://blogs.sugarfitglp.com/glossary/body-composition) ### Bioelectrical Impedance Analysis (BIA): What the Results Mean Query: bioelectrical impedance analysis BIA meaning Bioelectrical impedance analysis (BIA) estimates body composition by passing a very small electrical current through the body and measuring impedance. 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