Barbiturates Crossreactivity Table
| Compound | Conc. (ug.mL) | Effect |
| Secobarbital (cutoff) | 0.2 | Positive |
| Alphenal | 0.25 | Positive |
| Amobarbital | 0.3 | Positive |
| Aprobarbital | 0.2 | Positive |
| Barbital | 1.5 | Positive |
| Butabarbital | 0.25 | Positive |
| Butalbital | 0.4 | Positive |
| Butethal | 0.3 | Positive |
| Diallylbarbital | 0.6 | Positive |
| Pentobarbital | 0.5 | Positive |
| Phenobarbital | 0.8 | Positive |
| Talbutal | 0.08 | Positive |
| Thiopental | 0.8 | Positive |
| Acetaminophen | 1000 | Negative |
| Acetylsalicylic Acid | 1000 | Negative |
| Albuterol | 1000 | Negative |
| d-Amphetamine | 1000 | Negative |
| Caffeine | 100 | Negative |
| Codeine | 1000 | Negative |
| Diphenhydramine | 500 | Negative |
| Glutethimide | 80 | Negative |
| 5-OH-Phenyl-5- phenylhydantoin (HPPH) | 500 | Negative |
| Meperidine | 1000 | Negative |
| Methadone | 1000 | Negative |
| Methsuximide | 100 | Negative |
| Morphine | 1000 | Negative |
| Normethsuximide | 100 | Negative |
| Oxazepam | 500 | Negative |
| Phencyclidine | 1000 | Negative |
| Phenytoin (DPH) | 500 | Negative |
| Propoxyphene | 1000 | Negative |
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a Data shown was collected using SYNCHRON CX Systems. Equivalency between SYNCHRON LX Systems has been established by correlation analysis to SYNCHRON CX Systems.