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Diagnostics, Point-of-Care Diagnostic Testing by 837dc4f1ea930e97


									National Institutes of Health

Fact Sheet                                         Point-of-Care Diagnostic Testing

Point-of-care testing allows patient diagnoses in the physician’s office, an ambulance, the home, the field, or in the
hospital. The results of care are timely, and allow rapid treatment to the patient. Empowering clinicians to make decisions
at the “point-of-care” has the potential to significantly impact health care delivery and to address the challenges of health
disparities. The success of a potential shift from curative medicine, to predictive, personalized, and preemptive medicine
could rely on the development of portable diagnostic and monitoring devices for point-of-care testing.

•    In the earliest days of medicine, health care was             •    Biosensors are used clinically for toxicology and
     similar to point-of-care in that it was delivered in the           drug screens, measurement of blood cells and blood
     patient’s home through physician house visits.                     coagulations, bedside diagnosis of heart disease
                                                                        through detection of cardiac markers in the blood,
•    As medical discoveries were made and new                           and glucose self-testing.
     technologies developed, care then shifted to
     specialized hospitals with an emphasis on curative            •    Urinary tract infections are a serious health problem
     medicine.                                                          affecting millions of people each year. They result
                                                                        in more than 8 million office visits and over a
•    Large centralized laboratories were established, with              million hospitalizations each year. The total cost for
     cost-savings realized through the development of                   treatment reaches into the billions of dollars. A
     automated systems for analysis of patient samples.                 large share of that expense comes from waiting 48
•    Point-of-care devices were used on a limited basis in              hours for a urine sample to be cultured in the lab.
     the hospital for rapid analysis in intensive care units       •    NIH-supported researchers developed a sensor that
     and for simple home testing, such as with pregnancy                can identify, in 30 minutes, from a single drop of
     test kits.                                                         urine, the specific bacteria responsible for an
                                                                        individual’s urinary tract infection. This quick
Today                                                                   detection allows the patient to leave the physician’s
•     Point-of-care testing gives immediate results as                  office or clinic with a prescription specific for their
      samples do not have to be shipped off-site to a                   infection to begin immediate treatment.
      centralized laboratory.                                      •    The detection process works at the molecular level
•     The NIH supports the development of sensor and                    – when the genetic target from the bacteria is
      microsystem technologies for point-of-care testing.               recognized by the probes on the sensor, an
      These instruments combine multiple analytical                     electronic signal is generated. The signal is
      functions into self-contained, portable devices that              transformed by a computer chip on the unit into a
      can be used by non-specialists to detect and                      digital readout. This sensor system is the result of
      diagnose disease, and can enable the selection of                 collaboration between the UCLA Urology
      optimal therapies through patient screening and                   Department and GeneFluidics, Inc. GeneFluidics
      monitoring of a patient’s response to a chosen                    expects to have a system ready for FDA approval in
      treatment.                                                        about 2 years.

•     Sensor technologies enable the rapid analysis of
      blood samples for several critical care assays,
      including blood chemistry, electrolytes, blood
      gases, and hematology.

National Institutes of Health                                                                         Point-of-Care Diagnosis - 1
July 2007
•     With the development of miniaturized devices and        •   Low-cost diagnostic imaging devices can be used at
      wireless communication, the way in which doctors            the point-of-patient care for disadvantaged and
      care for patients will change dramatically and the          under-served populations in the U.S. as well as in
      role patients take in their own health care will            the developing world. The development of low-cost
      increase. Health care will become more                      imaging devices could make affordable diagnostic
      personalized through tailoring of interventions to          imaging more widely available, particularly in
      individual patients.                                        remote or rural communities and small hospitals
                                                                  that do not have ready access to these technologies.
•     The next decade will bring a new realm of precision
      and efficiency to the way information is transmitted    •   A new, low-cost ultrasound device could be used to
      and interpreted and thus the way medicine is                diagnose complication of pregnancy, hemorrhage
      practiced. In the future, clinicans may be able to          associated with trauma, renal obstructions, and
      improve the regulation of diet in infants with inborn       other conditions.
      errors of metabolism through bedside monitoring.
                                                              •   A new method using an optical probe for cervical
      Currently, management of such diseases requires
                                                                  cancer detection and treatment could significantly
      complex testing in a hospital setting. However,
                                                                  lower the mortality rate worldwide. Combining a
      researchers are developing a chemical sensor, using
                                                                  small optical imaging device with a treatment
      a small sample of blood from a fingerstick, that
                                                                  modality could provide both diagnosis and
      changes color in response to metabolic
                                                                  treatment of cervical cancer at the same time.
      irregularities. When such abnormalities are found,
      the diet of the infant can be adjusted immediately to
      prevent adverse effects such as mental retardation.
                                                              For additional information contact: Brenda Korte,
                                                              Ph.D. – 301-451-4778.

National Institutes of Health                                                                 Point-of-Care Diagnosis - 2
July 2007

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