Most routine medical laboratory tests are covered by provincial health insurance plans such as OHIP. Some important newer tests are not covered by all provincial plans. These tests, such as homocysteine and blood allergy testing (see Test Descriptions), might be covered by supplementary health insurance as part of your employment benefits package. Each insurance carrier has its own criteria for deciding which tests to cover, so you are advised to consult your benefits plan or to contact a representative from your employer’s human resources department for clarification. If a test is not covered by provincial or supplementary health insurance, you must pay for the test yourself.