Bone Mineral Content (BMC)

• An estimate calibrated against the DEXA method, which the manual calls the gold standard for measuring bone minerals.
• The manual publishes no general formula for the calculation, just as it publishes none for total minerals.
• The reference range appears on the sheet in brackets next to the value. The manual does not publish how it is calculated.
• The value appears on the Body Composition, Body Water and Research result sheets.
• The manufacturer internal validation study against DEXA covered fat free mass, fat mass and segmental lean mass. Bone minerals are not among the validated parameters.

• Read the value against the reference range in brackets. Absolute kilograms cannot be compared between people — a taller and more solidly built person naturally has more bone mineral.
• The manual gives no threshold or interpretive bands for this value. Its only concrete recommendation is tied to total minerals: if their value is markedly lower than the reference, it recommends a bone densitometry examination.
• The value does not establish whether your bones are strong. It describes the estimated amount of mineral mass, not its density or structure.
• Because it is an estimate derived partly from body composition, it moves with build. It is not an independent indicator of skeletal status.

• In an adult, bone minerals change very slowly. Differences between measurements weeks or months apart are practically always within the uncertainty of the estimate.
• If the value moved together with a change in weight or muscle mass, that points to changed inputs to the estimate rather than a real change in bone.
• The trend of this value has no standalone use for an ordinary client. If the development of your skeleton interests you, that belongs with a doctor and a bone densitometry examination.
• An abrupt change between two visits is a reason to check the measurement conditions, not to interpret it as a change in bone.

General principles: how to read change between measurements →

• Total minerals – bone minerals are their main part.
• Soft Lean Mass – produced by subtracting bone mineral content from fat free mass.
• Fat free mass – the parent quantity that includes bone minerals.
• Skeletal Muscle Mass – the manual describes a link between higher muscle mass and higher bone mass.
• Weight – bone minerals are part of it, if a small one.

• BMC is not bone density. It describes the estimated amount of mineral mass, not its ratio to bone area or volume.
• It is not a substitute for bone densitometry. The manual itself recommends that examination where the mineral component is markedly reduced.
• The value is not measured. It is an estimate calibrated against DEXA.
• A lower value in a smaller person is not a finding. The amount of bone mineral follows from body size.

• Hydration status, because the estimate builds on body composition derived from body water.
• Food, drink and training before the measurement, which change the estimate of the other components.
• The accuracy of the entered height, age and sex, because the reference derives from them.
• Time of day and body position before the measurement.

• Treat bone minerals as a supplementary item in the weight breakdown. Do not build a decision on it alone.
• If the state of your bones interests you, take it to a doctor and, where indicated, a bone densitometry examination. Bioimpedance does not answer that question.
• When following body composition, pay attention to muscle and fat mass. Those change measurably and over a horizon worth tracking.
• If your history includes fractures from minor injuries, long-term corticosteroid treatment or another risk factor, discuss it with a doctor regardless of this value.

• It is not a measured value but an estimate calibrated against DEXA.
• It does not establish bone density or fracture risk.
• It does not replace a bone densitometry examination.
• It is not among the parameters validated against DEXA in the manufacturer internal study.
• The manual gives no thresholds or interpretive bands for it.