Abstract
A non-radioactive fluorescent excitation analysis technique was used to measure total red blood cell volume in 31 unanaesthetised pig fetuses in utero. Red blood cell volume (y in ml) was closely related (r = 0.94) to fetal bodyweight (x in g): where y = 2.92 + 0.0291x. Average red blood cell volume was 34 +/- 1 ml kg-1 fetal bodyweight. Average estimated (total) blood volume was 117 +/- 3 ml kg-1 fetal bodyweight. It was concluded that this non-radioactive indicator dilution measurement of red blood cell volume is a significant advance over the established 51Cr method, and that measurement of red blood cell volume may be used to estimate fetal bodyweight in utero.
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