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Ultrasound of the IVC for Volume Assessment
- In a recent pearl, I discussed that a 15% variation in IVC collapsibility could be used as a marker of hypovolemia
- As a follow up and since % variation is sometimes difficult to calculate at the bedside, consider the following numbers:
- The normal diameter of the IVC is 1.6 - 1.75 cm
- Patients with hypovolemia typically have an IVC diameter < 0.8 - 1.0 cm
- In general, the IVC diameter should increase 1 mm for every 100 ml of isotonic fluid