What Substances Can Cause a False Positive Kastle Meyer Test Result

The test will give a false positive result when in the presence of vegetable peroxidases, such as those in horseradish, broccoli, cauliflower, etc. Additionally, other oxidizing species in the sample will also cause a false positive.

Can you get a false positive on a presumptive blood test?

A presumptive test is a qualitative analysis that allows to identify, or confirm, the presence of a substance in a sample. These determinations usually occur, after a chemical reaction, and a specific colour is produced. A false positive is another substance reacting the same way, producing the expected result.

What is the disadvantages of a Kastle Meyer test?

A negative result is generally proof of the absence of detectable quantities of heme, however a false negative can be generated in the presence of a reducing agent. The test is unable to give specific evidence as to what is in the blood.