Table 4. Toxicology panel showing significantly elevated blood levels of metformin.

Toxicology panel	Values	Reference range
Metformin	29	1-2 mcg/mL
Salicylate	<2.5	<2.5
Acetaminophen	<10	<10
Desipramine	<5	Therapeutic range changes
Imipramine	<5	Therapeutic range changes
Amitriptyline	18	Therapeutic range changes
Doxepin	<5	Therapeutic range changes
Doxepin Total	<5	Therapeutic range changes
Nordoxepine	<5	Therapeutic range changes
Total Amitriptyline and Nortriptyline	31	100 - 250 mcg/L
Desmethylclomipramine	<5	150 - 350 mcg/L
Total Clomipramine	None detected	Unknown
Methanol	<0.01	<0.01
Ethylene glycol	20
Isopropanol	<0.01	<0.01
Acetone	140	<100 = negative, >150 = acetone metabolic imbalance