During sweat collection, which factor can cause falsely high results?

During sweat collection, which factor can cause falsely high results?

• A. High ambient temperature
• B. Evaporation
• C. Preparation of area with type 1 water
• D. High sweat rate

Answer: (B)

Evaporation directly changes the concentration in the collected sweat. When sweat sits exposed to air, water can evaporate, leaving the dissolved minerals (like sodium and chloride) more concentrated. That concentration increase makes the lab measurements appear higher than the true values, giving falsely elevated results. To prevent this, keep the collection container sealed or covered and analyze the sample promptly to minimize evaporation. While ambient temperature or a high sweat rate can affect how much sweat is collected, they don’t inherently concentrate the sample the way evaporation does. Preparing the skin with water doesn’t cause a true rise in solute concentration either.

Evaporation directly changes the concentration in the collected sweat. When sweat sits exposed to air, water can evaporate, leaving the dissolved minerals (like sodium and chloride) more concentrated. That concentration increase makes the lab measurements appear higher than the true values, giving falsely elevated results. To prevent this, keep the collection container sealed or covered and analyze the sample promptly to minimize evaporation. While ambient temperature or a high sweat rate can affect how much sweat is collected, they don’t inherently concentrate the sample the way evaporation does. Preparing the skin with water doesn’t cause a true rise in solute concentration either.