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Many illnesses change the concentration of chemicals in the body and this means that the biochemistry lab often receives the largest number of samples each day.. It is here they perform many of the most commonly-requested tests, including Kidney Function Test, Liver Function Test, Lipid profile, Cardiac Profile, etc. Biochemistry is also responsible for performing blood glucose to diagnose and monitor diabetes. They will also measure metabolic products, proteins and drugs, mainly in blood but also in urine, CSF and other body fluids.


The pathologists and scientists working in haematology specialise in the blood and bone marrow (where blood cells are formed). Some further specialise in areas such cancers of the blood, where they lead multi-disciplinary teams diagnosing and managing leukaemia and lymphoma. This includes looking for abnormal cells and cell patterns under the microscope. Others specialise in coagulation (blood clotting) – important in a range of illnesses from stroke, heart disease and post-surgery treatment to pulmonary embolism and Deep Vein Thrombosis. The Full Blood Count, one of the most commonly-requested tests because it can tell so much about a patient’s health, is performed here. Blood banking, blood typing and antibody testing are also part of haematology’s work.


The investigation of infectious diseases is carried out in microbiology. The pathologists and scientists working here look for specific bacteria, viruses, fungi and parasites that may be causing a patient’s symptoms. The work can involve growing (or culturing) a particular bacteria in an incubator that mimics the perfect environment for the microorganism, then examining the results under the microscope (microscopy). This lab also measures the susceptibility of the bacteria to antibiotics to help decide on treatment.


Central to the body’s ability to fight infection is the production of antibodies – proteins produced in response to a foreign organism or substance. Without adequate levels of antibodies, the body’s defence is lowered but high levels of antibodies can be indicative of autoimmune disease.

Immunology specialises in disorders of the immune system including autoimmune disorders such as rheumatoid arthritis, SLE (lupus), and coeliac disease. It also performs tests to establish whether or not someone is immunodeficient. This can be inherited, the result of an infection or a disease, or produced as a side effect of drugs, such as those used to treat cancer.


In some diseases it’s not possible to identify the bacteria or virus that is causing an infection, instead, the antibodies produced by the immune response are investigated. The scientists working in serology examine blood serum for antibodies to infections such as colds and flu, Epstein Barr virus (glandular fever), rubella (measles) and Ross River fever. Allergies are also tested in this way. One of the most common tasks performed in the serology lab is to measure levels of antibodies to find out if a patient has had a recent infection, a past infection, or a response to a vaccination. In some cases, antibody tests can help monitor a patient’s treatment to see if it is being effective.


This is one of the newest areas of pathology where specialists use advanced technology to investigate genes and chromosomes. They could be looking for gene mutations and chromosomal abnormalities caused by an inherited condition, or chromosomal changes and gene mutations (somatic) created as part of the cancer process. By identifying the type of mutations or specific chromosome abnormalities, a sub classification of cancer can be diagnosed, which is important in making decisions about treatment. For more see Genetic testing.

This testing is performed with technologies such as fluorescent in-situ hybridization (FISH) and the Polymerase Chain Reaction (PCR). The same techniques are also used to look for the genetic evidence of bacteria or viruses, providing a quicker way of testing for infections than conventional methods.


Cellular (or anatomic) pathology is the branch of medicine that involves the study of body organs and tissues (groups of cells). Cellular pathology is considered one of the diagnostic branches of medicine, along with radiology and other pathology specialties (e.g. microbiology and chemical pathology). Its roles include determining the cause of certain diseases and the effect(s) that they are having on the body, assisting with the choice of treatment that will be given, aiding in giving a prognosis and determining what may have caused a person’s death.

Cellular pathology is vital in those parts of medicine where a specimen of tissue or a sample of tissue cells is taken from the patient and sent to the laboratory. In these situations anatomical pathology is the specialty that gives the definitive diagnosis and allows clinicians to give the most appropriate advice and treatment to their patients.

There are two main subdivisions within cellular pathology. The first is histopathology, which involves the examination of sampled whole tissues under the microscope. This is often aided by the use of special staining techniques and other associated tests, as described later. The second subdivision is cytopathology (cytology), which is the examination of single cells. A common cytology test is the cervical smear.

Cellular pathologists are also involved in performing post-mortem examinations (or autopsies), which is the examination of the body of a deceased person. An autopsy is usually performed after a person has died of an illness which could not, for whatever reason, be properly or fully diagnosed before death. This would have to be consented to by the next of kin of the deceased person. If the cause of death is suspicious or unknown (i.e. not known to have been related to illness), the autopsy will be performed by a forensic pathologist, a related but separate type of medical specialist. Consent from next of kin is not required for a medico legal/coronial autopsy.