foam stability test

foam sta·bil·i·ty test

a test for fetal pulmonary maturity, determined by the ability of pulmonary surfactant in amniotic fluid to generate stable foam in the presence of ethanol after mechanical agitation.
Synonym(s): shake test
References in periodicals archive ?
Further, Halliburton has attempted repeatedly to correct the National Commission's mistaken conclusion that a foam stability test normally requires 48 hours.
Contrary to the National Commission report, a foam stability test does not require 48 hours to complete.
The second April foam stability test was a re-test due to the lab errors in the first test.
The first April foam stability test is irrelevant because of lab technician error in weighing up the sample of the cement mix.
A foam stability test was not conducted on the nine gallon formulation.
The cleansing composition has an improved average foam stability ranging between 35-60mm according to the foam stability test, wherein the ratio of surface-active agent to oil is in the range of 1:0.