ALT Routinely Recorded Remotely: A Comparator Study of Liver Function Tests Using the Tasso+ to Venipuncture.

Inclusion Criteria: 1. Subject must be willing and able to provide written informed consent prior to study entry 2. Subject is ≥ 18 years of age. 3. Subject must meet the following criterion: known recent history of liver function abnormality and requiring follow-up Liver tests (including ALT\>3XULN) 4. Subject must be willing and able to adhere to the assessments, study schedule, prohibitions and restrictions as described in the protocol. 5. Patients may be on any treatment / therapeutic clinical trial as indicated by treating physician Exclusion Criteria: 1. Pregnant or nursing female by self-report. 2. Presents with abnormal skin integrity or atypical skin health within the areas to be tested (upper shoulders). 3. Subjects who have applied lotion to the skin on the shoulder the day of the visit. 4. Patients with hepatic encephalopathy 5. Vulnerable populations (children, prisoners, pregnant women, participants with diminished decision-making capacity, illiterate populations, educationally disadvantaged populations).