You can use point of care ultrasound of the liver when you encounter a patient with right upper quadrant (RUQ) pain and acute changes in liver function tests.
For the purposes of this abdominal ultrasound guide, the most important measurement to keep in mind is the craniocaudal length of the right lobe. Although liver size varies considerably from patient to patient, depending on age, sex, habitus, and other factors, a healthy liver should be < 16cm in this dimension. This corresponds to roughly the 5th – 11th right intercostal spaces.