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To the Editor:
In working with the Tallqvist hemoglobin scale, I find that by taking three drops of blood about 2 cm. apart, each drop coming under an opening in the scale, one can determine the results of the hemoglobin test much better than by the one drop system, as it affords three scales to read from at once.
Weidmann RJ. THREE DROP METHOD OF DETERMINING HEMOGLOBIN BY THE TALLQVIST SCALE. JAMA. 1918;70(21):1563. doi:https://doi.org/10.1001/jama.1918.02600210053029
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