Blood gas study/oxygen saturation test must be performed by a. physician or qualified provider or supplier of laboratory services. that is registered and able to bill for the test. Test performed in. a qualified providerâs office must be reviewed and signed by. patientâs physician or qualified provider. Medicare requires that test results be documented in patientâs. medical record and made available to the oxygen provider. If test. is not taken under these conditions, additional documentation. must be obtained from physician.
President James Monroeâs 1823 annual message to Congress contained the Monroe Doctrine, which warned European powers not to interfere in the affairs of the Western Hemisphere. Understandably, the United States has always taken a particular interest in its closest neighbors â the nations of the Western Hemisphere.
Although the European powers did make military interventions in Latin America from time to time after the Monroe Doctrine was announced, the Americans did not look for war. They did, however, use the doctrine as justification for taking Texas in 1842 under President John Tyler.