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Fig. 6 | Maternal Health, Neonatology and Perinatology

Fig. 6

From: Congenital Diaphragmatic hernia – a review

Fig. 6

Lung to head ratio (LHR) measurement – Obstetric ultrasound technique is used to measure the lung to head ratio known as LHR to assess the severity of CDH. The head circumference is measured as shown. The contralateral lung area is calculated as a product of the longest and perpendicular diameter of the contralateral lung. The ratio of this area to the head circumference gives the LHR. A LHR of <0.6 has been associated with poor outcome while a ratio of >1.35 has been associated with survival. Alternatively, an observed to expected LHR measurement is used in order to overcome bias secondary to gestational age. (Copyright Satyan Lakshminrusimha)

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