The plasma levels of high density lipoprotein cholesterol (HDL-C) were reduced in 16 hyperthyroid female patients compared to 37 euthyroid women (33.5 +/- 8 vs. 51.5 +/- 13 mg/dl (mean +/- SD); P less than 0.001). When 5 patients were restudied after restoration of the euthyroid state, plasma HDL-C increased from 29 +/- 5 to 43 +/- 11.5 mg/dl (P less than 0.05). In addition, in 22 hypothyroid women, HDL-C levels were also diminished compared to the euthyroid group (43.4 +/- 15.5 vs. 51.5 +/- 13 mg/dl; P less than 0.05). Nine patients were restudied after L-T4 replacement therapy; their levels of HDL-C increased but not to a statistically significant degree. The daily administration of 0.3 mg L-T4 to eight normal male volunteers for 1 month did not significantly affect HDL-C levels.
A patient with chronic hemolytic anemia presented with an acute hemolytic crisis, a high count of nucleated red blood cells (NRBC), and artifactual hypoglycemia. Temporal events showed a parallel relationship between an increased number of nucleated RBCs and an excess in vitro consumption of glucose.
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