The HLA-B*57:01 allele, associated with abacavir hypersensitivity, was not detected in this patient. The patient may be prescribed abacavir. Please refer to the hospital formulary guidelines for specific dosing information. It should be noted that a negative HLA-B*57:01 result does not absolutely rule out the possibility of some form of abacavir hypersensitivity. Administration of abacavir therapy requires close observation including immediate discontinuation of therapy should any signs or symptoms of hypersensitivity develop.