| Hellin's law | Twins occur once in 89 births, triplets once in 892, and quadruplets once in 893. If the frequency of twins in a population is p, the frequency of triplets is p2, and the frequency of quadruplets is p3. (05 Mar 2000) |
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| Hellin, Dyonizy | <person> Polish pathologist, 1867-1935. See: Hellin's law. (05 Mar 2000) |
| hellp syndrome | <syndrome> Haemolysis-elevated liver enzymes-low platelet count syndrome. A pre-eclamptic or eclamptic disorder with the findings shown in the clinical description from which the acronym is created. Severe hypertension may be present. Abnormal sgot and sgpt levels also appear. (12 Dec 1998) |
| Helly's fixative | A combination of potassium dichromate, mercuric chloride, formaldehyde, and distilled water, used as a microanatomic fixative for cytoplasmic granules and nuclear staining; has the same disadvantages as Zenker's fixative. (05 Mar 2000) |
| Helly, Konrad | <person> Swiss pathologist, *1875. See: Helly's fixative. (05 Mar 2000) |