What tests can you do on a blood sample after 4 hours?

After 4 hours, various tests can still be performed on a blood sample, including complete blood count (CBC), basic metabolic panel (BMP), and liver function tests. However, certain tests, like coagulation studies, may be affected by delays in processing. It's important to store the sample properly and avoid hemolysis or contamination to ensure accurate results. In some cases, specific tests may have a limited time frame for reliability, so prompt analysis is preferable.