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lecithin-sphingomyelin ratio

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n.
The ratio of lecithin to sphingomyelin present in amniotic fluid, used to determine fetal pulmonary maturity.
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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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