Three CSF tubes are received in the laboratory, numbered 1 through 3 based on the order in which they were obtained, with 1 being the first. The first tube is cloudy pink, but this color diminishes and clearing occurs with each successive tube
What does this suggest?
a. Internal bleeding into the CSF has occurred.
b. This is blood contaminating the CSF fluid from a traumatic puncture.
c. Bacterial infection is likely present.
d. Metastatic tumor is likely present.
ANS: B
The turbid and pink color is due to the presence of red cells in the fluid. Because each succeeding tube becomes clearer and the pink color diminishes, a traumatic tap is most likely the cause. If there had been internal bleeding into the CSF, then each tube would appear the same. The presence of bacterial infection or metastatic tumor cells cannot be determined by simply a gross examination of the fluid.
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