Cold sores have very recognizable features. They are most often diagnosed by physical exam and by your medical history. If your doctor is not sure, a sample of the fluid or tissue from the blister may be taken. A blood sample may also be taken for testing. Viral culture—A sample of the fluid from the cold sore blisters is taken with a cotton swab. This is done as soon as possible after an outbreak begins. Oesophagus was thickened.
This test is very accurate if the sample is taken while there are still clear blisters. Tzanck test—The cold sore is lightly scraped to collect cells onto a glass slide. These cells are then examined under a microscope. In pregnant women, this test should not be used as the sole criterion for the diagnosis of current herpes simplex infection. Tests to detect the presence of antibodies in your blood. These particular antibodies are created by your body to fight herpes simplex virus (HSV) infections. This test may be done when no sores are present.
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.