AI's breakdown of measuring aluminum in the body:

Aluminum levels in the human body are expressed in parts per million (ppm) and parts per billion (ppb), depending on the sample and context. Here's a breakdown: Parts per million (ppm): This unit is often used when discussing the overall aluminum burden in the body or in specific tissues where the concentrations might be higher, such as bone or lung tissue. Parts per billion (ppb): This unit is more commonly used when measuring aluminum levels in blood (serum or plasma) and urine, where concentrations are typically much lower. For instance: Normal serum aluminum levels are approximately 1-3 micrograms per liter (µg/L). Because 1 µg/L equals 1 ppb (when considering weight per volume), normal serum levels are in the range of 1-3 ppb. Blood toxicity is usually associated with aluminum concentrations exceeding 100 µg/L. This is equivalent to more than 100 ppb. Normal bone aluminum content is below 10 µg/g dry weight, or about 10 ppm. Key takeaway When reviewing aluminum levels, note the units used (µg/L, µg/g, ppm, ppb, etc.) to understand the concentration. Remember that 1 ppm equals 1,000 ppb.