Sheila Crisostomo – The Philippine Star February 1, 2022 | 12:00am MANILA, Philippines — The Department of Health (DOH) has recommended that self-administered antigen tests be used only for symptomatic individuals within seven days from onset of symptoms. In DOH Memorandum No. 2022-0033 containing the guidelines for the use of antigen test kits, the DOH said that reverse transcription polymerase chain reaction (RT-PCR) remains to be the “preferred diagnostic method for COVID-19.” The agency noted that self-administered antigen testing is recommended when the capacity for “timely RT-PCR results…