What does Hemastix test for?
Detection of presence of blood in urine. The Hemastix® urinalysis test strip is the reliable frontline test for detection of blood. The strips are for professional, in vitro diagnostic use only.
What are Hemastix strips used for?
Specifications
| For Use With (Application) | For used at crime scenes to determine if what is being photographed at the scene is actually blood spatter |
|---|---|
| Product Type | Hemastix™ Reagent Strip |
What does it mean when a Hemastix strip turns green?
A Hemastix strip can be rubbed on the wet stain; a green to blue color means that blood is present. Substances other than blood, such as dry bleach residues and some plastics, can cause similar results.
Is the Hemastix test a confirmatory test?
Abstract. Kastle Meyer and Hemastix reagents are presumptive tests commonly used in forensic casework for the detection of blood, and their suitability has been reviewed in numerous publications.
Is Hemastix presumptive?
The Hemastix® test has been identified as the easiest presumptive test to perform and the second most sensitive method used in forensic science (Johnston et al., 2008, Tobe et al., 2007, Veall and Matheson, 2013, Webb et al., 2006).
What color of a Hemastix is present with a negative result?
A color change to orange through green or blue indicates a positive result. No color change indicates a negative result.
What substances can be detected with luminol?
Forensic investigators use luminol to detect trace amounts of blood at crime scenes, as it reacts with the iron in hemoglobin. Biologists use it in cellular assays to detect copper, iron, cyanides, as well as specific proteins via western blotting.
Can hydrogen peroxide hide blood from luminol?
It can affect the luminol and Bluestar® Forensic tests by causing a negative result, even in the presence of blood. Hydrogen peroxide is a common disinfectant and a necessary component of most presumptive blood tests, however, bulk quantities of it in the luminol reaction stop the reaction from proceeding.
What do the positive and negative results of a luminol test look like?
If the swab changes color within about 10 seconds then the test result is positive. No color change indicates a negative result.
What completely removes traces of blood?
Scientists have shown that traces of blood in various materials are eliminated completely when they are washed with detergents containing active oxygen.