Noun. 1. preliminary exam – an examination taken by graduate students to determine their fitness to continue. preliminary examination, prelim. exam, examination, test – a set of questions or exercises evaluating skill or knowledge; “when the test was stolen the professor had to make a new set of questions”

Luminol, leuchomalachite green, phenolphthalein, Hemastix, Hemident, and Bluestar are all used as presumptive tests for blood.

Confirmatory tests for blood include identification of blood cells under a microscope [Shaler, 2002], crystal tests such as the Teichman and Takayama tests [Shaler, 2002; Spalding, 2003], and ultraviolet absorption tests [Gaensslen, 1983].

There are two main types of tests used to determine whether an illegal drug is present in a substance: presumptive tests and confirmatory tests. Presumptive tests are less precise and indicate that an illegal substance may be present. Confirmatory tests provide a positive identification of the substance in question.

Blood is the only body fluid that will give a positive reaction. Positive results must be confirmed with Precipitin Test. Once a presumptive test indicates that a stain may be blood, the serologist must confirm that it is human blood.

Presumptive tests, such as those where a color change occurs, are those that usually identify a class of compounds whereas a confirmatory test, such as mass spectrometry, is one that conclusively identifies a specific, individual com- pound.

A presumptive test is a qualitative analysis that allows to identify, or confirm, the presence of a substance in a sample. These determinations usually occur, after a chemical reaction, and a specific colour is produced.

The purpose of a presumptive test for blood is to determine whether or not it is likely that this body fluid is present; in other words, a positive result indicates the possibility of blood. A positive result of a confirmatory test for blood allows one to conclude that blood is present.

Purposes. Preliminary studies are often conducted to refine the intervention and evaluate its acceptability, feasibility, cost, and uptake.

Preliminary examination of a salt often furnishes important information, which simplifies further course of analysis. Although these tests are not conclusive but sometimes they give quite important clues for the presence of certain anions or cations. These tests can be performed within 10-15 minutes.

(kŏn-fĭr′mă-tor″ē) A examination used to validate the results obtained by another. The confirmatory examination may be more sensitive or specific but must be based on different examining principles.

Diagnosis. A quicker test checks for HIV antigen, a protein produced by the virus immediately after infection. It can confirm a diagnosis soon after infection and allow the person to take swifter steps to prevent the spread of the virus to others.

Your doctor may order a complete blood count (CBC) as part of your routine physical. The results of the test can alert your doctor if you have anemia or a low platelet count, which can interfere with your ability to clot . This test measures Factor V, a substance involved in clotting .

Types of Laboratory Tests Doctors May Order Hematological Blood Tests Coagulation Laboratory Tests Chemical Blood, Urine and Body Fluid Tests Microbiology Laboratory Tests Urine Laboratory Tests Serological Laboratory Tests Cytology , Histology and Pathology Immunohematology and Blood Banking

Coders use two CPT codes for the complete blood count. Code 85025 is for the automated CBC with platelet count, hemoglobin, hematocrit, red blood cell count and white blood cell count.