Results & Conclusions

Results & Conclusions

Figure 1 presents the results across all 938,586 tests:

  • 11.1% (n=103,846) of patients testing positive for at least one illicit substance.
  • 29.4% (n=275,563) testing positive for at least one nonprescribed medication.
  • 38.4% (n=360,347) with no detectable level of the medication prescribed by the physician.

When applying the expected ranges offered by Ameritox, Ltd., the study found:

  • 15.2% (n=142,754) of patients had a level of the prescribed medication that was below the expected range for that medication.
  • 26.6% (n=249,882) of patients had a level of the prescribed medication that was higher than the expected range.
  • 25.5% (n=238,940) had no evidence of abnormal drug use.

The results of all UDTs stratified by demographic categories are presented in Table 2. Pearson’s chi-squares were performed to test associations between demographics and test results.

In the 103,846 patients who tested positive for at least one illicit substance, 38.7% (n=40,178) also tested positive for at least one nonprescribed medication, and 44.9% (n=46,620) had no detectable level of the medication prescribed by the physician.

Of the 834,740 patients who had tested negative for an illicit substance, 20.6% (n=171,717) tested positive for at least one nonprescribed medication, and 37.6% (n=313,727) had no detectable level of the medication prescribed by the physician (Fig. 2).

Using Pearson’s chi-squares, both comparisons yielded significant associations with P < 0.0001. This comparison demonstrates the heightened awareness that clinicians should have when treating patients who test positive for at least one illicit substance, as their rates of testing positive for at least one nonprescribed medication or having no detectable level of the medication prescribed by the physician are higher than their counterparts.

Fig. 1. Aggregate test results of patients administered urine drug screening using Rx GuardianSM testing (January 2006 - January 2009)

Figure 1

 

Table 2. Test results by demographic of urine drug screening using Rx GuardianSM testing (January 2006 - January 2009)

Table 2

 

Fig. 2. Urine test results in patients testing positive or negative for illicit substances

Figure 2