[Screening for colorectal cancer with a test for occult blood in stool (author's transl)].

Results of an occult-blood-test in 1 072 persons are reported. The test, recently registered as KRYPTO-HAEM, was developed by the Central Institute of Molecular Biology of the Academy of Sciences of the GDR. 27 patients (2.5%) had positive findings and by clinical examination 1 carcinoma of the sigmoid colon and 2 adenomas were detected. In 1 case (adenoma of the rectum) the test had a false-negative result. The findings were compared with own experiences with the HAEMOCCULT-Test. The KRYPTO-HAEM-Test is recommended for screening for colorectal tumors.