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Quick Answer. A personâs normal ammonia level typically ranges between 15 to 45 micrograms per deciliter. To determine these levels, an ammonia blood test is performed.
NH4+ (this is called ionized ammonia). Together, these two forms of ammonia are called TAN which means total ammonia nitrogen. NH3 is the principal form of toxic ammonia. It has been reported toxic to freshwater organisms at concentrations ranging from 0.53 to 22.8 mg/L.Toxic levels are both pH and temperature dependent. Toxicity increases as pH decreases and as temperature decreases.H4+ (this is called ionized ammonia). Together, these two forms of ammonia are called TAN which means total ammonia nitrogen. NH3 is the principal form of toxic ammonia. It has been reported toxic to freshwater organisms at concentrations ranging from 0.53 to 22.8 mg/L.