Raygat’s test is used for ?
a) Weight of lung
b) Specific gravity of lung
c) Consistency of lung
d) None
Correct Answer - B
Ans. is ‘b’ i.e., Specific gravity of lung
Hydrostatic test (Raygat’s test, 1" life test) : The specific gravity of a
non-respired lung is 1040-1050 and of a respired lung is 940-950,
so, after respiration lung floats on water (specific gravity of water is
1000). False positive hydrostatic test may occur (i.e.non-respired
lung may float) in decomposition and in attempted artificial
respiration. False negative hydrostatic test (i.e. respired lung may
sink down) may occur in atelectasis, pulmonary oedema,
bronchopneumonia, and congenital syphylis.