Bone Densitometry Precision Calculating Tool

Version 2.5

This calculator is also provided as a free download by the International Society for Clinical Densitometry (ISCD). As an alternative to the online version, use this calculator to determine the Least Significant Change at the 95% confidence level for serial BMD testing. If you have special requirements for precision testing, please see Advanced Precision Calculator.

Instructions: Enter BMD to 3 decimal places for 15 patients 3 times each or 30 patients 2 times each, for each ROI. The calculator does the rest.

# Scan 1 Scan 2 Scan 3 SD SD sq SD SD sq
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Skeletal Site / ROI:

For 15 patients tested 3 times each:

Sum : N/A
n : 15
Sum / n : N/A
SqRt : N/A
PE : N/A
LSC = N/A

For 30 patients tested 2 times each:

Sum : N/A
n : 30
Sum / n : N/A
SqRt : N/A
PE : N/A
LSC = N/A

DEVELOPED BY: NELSON WATTS, MD, CCD for ISCD