A recent article in The Journal1 on the coagulation of the blood in pneumonia seems to us rather misleading, not only in its deductions but also in the methods employed.
Anders and Meeker determined the coagulation time by obtaining blood from puncture of the ear or finger. Any such method of obtaining blood for determining the coagulation time is so clearly open to error that it should be discarded. While the method of obtaining blood by venous puncture and allowing it to clot either directly or by recalcifying the oxalated plasma at room temperature in glass tubes evidently intrudes artificial conditions, which doubtless interfere somewhat with accuracy, nevertheless it can be emphatically stated that the obtaining of blood by rapid venous puncture is a necessary step in making observations of any value on the coagulation time of the blood.2
The main reason for insistence on this point
MINOT GR, LEE RI. COAGULATION TIME OF THE BLOOD IN PNEUMONIA. JAMA. 1917;LXVIII(7):545-546. doi:10.1001/jama.1917.04270020209016