Abderhalden reac'tlon or test

(ahb'der-haW'den) [Erail Abderhalden, German physiologist, *i877.] To determine the presence of protective ferments* in the blood; one-half gram of the prepared albumin (from the placenta, cancer, urine, or what not) is placed in a diffusion* shell, together with 1.5 c.c. of the serum to be tested, and the shell is suspended in a test-tube containing 20 c.c. sterile distilled wate^; the tube containing the shell is then incubated at 37°C. for 16 hours, after which 10 c.c. of the dialysate is removed and boiled for one minute with 0.2 c.c. ninhydrin; the development of a violet color within half an hour indicates a positive reaction. The test has been used to detect pregnancy,