Free NNAL Measurement

**Semantic type:** Laboratory Procedure

**Definition:** The determination of the amount of free 4-(methylnitrosamino)-4-(3-pyridyl)-1-butanol (NNAL, Free) in a sample.

**Synonyms:** - 4-(Methylnitrosamino)-4-(3-pyridyl)-1-butanol, Free - NNAL, Free - NNAL, Free - NNALFR